REFER TO THE START-UP QUICK GUIDE BELOWDURING INSTALLATION AND COMMISSIONING. IF ANY PROBLEMS OCCUR, PLEASE CONTACT YOUR LOCAL DISTRIBUTOR Start-up Quick Guide 1. Check that the product corresponds to your order, see Chapter 3. 2. Read the safety instructions carefully in Chapter 1, before commencing commissioning.
CONTENTS NX USER’S MANUAL INDEX SAFETY EU DIRECTIVE RECEIPT OF DELIVERY TECHNICAL DATA INSTALLATION CABLING AND CONNECTIONS CONTROL KEYPAD COMMISSIONING FAULT TRACING NX APPLICATION MANUAL BASIC APPLICATION STANDARD APPLICATION LOCAL/REMOTE CONTROL APPLICATION MULTI-STEP SPEED CONTROL APPLICATION PID CONTROL APPLICATION MULTI-PURPOSE CONTROL APPLICATION PUMP AND FAN CONTROL APPLICATION...
4(86) THE NX FREQUENCY CONVERTER USER'S MANUAL AND THE APPLICATION MANUAL The User's Manual will provide the necessary information about the installation, commissioning and operation of NX Frequency Converters. It is recommended that these instructions are studied, before powering up the frequency converter for the first time. The Application Manual provides information about the different applications included in the standard frequency converter.
NX User's Manual Index SAFETY... 7 ... 7 ARNINGS ... 7 AFETY INSTRUCTIONS ARTHING AND EARTH FAULT PROTECTION ... 8 UNNING THE MOTOR EU DIRECTIVE... 9 ... 9 MARKING ... 9 DIRECTIVE 2.2.1 General ... 9 2.2.2 Technical criteria ... 9 2.2.3 NX frequency converter EMC classification ...
6(86) 126.96.36.199 Jumper selections on the NXOPTA1 basic board ... 44 CONTROL KEYPAD ... 46 NDICATIONS ON THE EYPAD DISPLAY 7.1.1 Drive status indications... 46 7.1.2 Control place indications ... 47 7.1.3 Status LEDs (green – green – red) ... 47 7.1.4 Text lines...
SAFETY ONLY A COMPETENT ELECTRICIAN SHOULD CARRY OUT 1.1 Warnings The components of the power unit of the frequency converter are live when the NX is connected to mains potential. Contact with this voltage is extremely dangerous and may cause death or severe injury. The control unit is isolated from the potential.
8(86) 1.3 Earthing and earth fault protection The NX frequency converter must always be earthed via a conductor connected to the earthing terminal The earth fault protection inside the frequency converter protects only the converter itself against earth faults in the motor or the motor cable. If fault current protective switches (e.g.
EU DIRECTIVE 2.1 CE marking The CE marking on the product guarantees the free movement of the product within the EEA (European Economic Area). It also guarantees that the product meets the various requirements defined by the directive. The NX frequency converters carry the CE label as a proof of compliance with the Low Voltage Directive (LVD) and the Electro Magnetic Compatibility (EMC).
10(86) Class T: The T-class converters have a small earth current and can be used with IT supplies only. If they are used with other supplies no EMC requirements are complied with. Class N: The drives of this class do not provide EMC emission protection. This kind of drives are mounted in enclosures.
EU DECLARATION OF CONFORMITY Manufacturer's name: Manufacturer's address: P.O.Box 25 hereby declare that the product Product name: Model designation: has been designed and manufactured in accordance with the following standards: Safety: EMC: and conforms to the relevant safety provisions of the Low Voltage Directive (73/23/EEC) as amended by the Directive (93/68/EEC) and EMC Directive 89/336/EEC.
12(86) RECEIPT OF SHIPMENT The NX frequency converters have undergone rigorous tests and quality checks at the factory before delivery. However, after unpacking the product, check that no signs of transport damages are to be found on the product and that the delivery is complete (compare the type designation of the product to the code below, Figure 3-1.
Receipt of shipment 13(86) 3.3 Maintenance In normal conditions, the NX frequency converters are maintenance-free. However, it is recommended the heatsink be cleared periodically with compressed air.The cooling fan can easily be changed if necessary. 3.4 Warranty Only manufacturing defects are covered by the warranty. The manufacturer assumes no responsibility for damages caused during or resulting from transport, receipt of the delivery, installation, commissioning or use.
14(86) TECHNICAL DATA 4.1 Introduction Figure 4-1 presents the block diagram of the NX frequency converter. The frequency converter consists of two units, the Power Unit and the Control Unit. The three-phase AC-choke (1) at the mains end together with the DC-link capacitor (2) form an LC-filter, which, again, together with the diode bridge produce the DC-voltage supply to the IGBT Inverter Bridge (3) block.
Technical data 15(86) The control keypad provides a link between the user and the frequency converter. The control keypad is used for parameter setting, reading status data and giving control commands. It is detachable and can be operated externally and connected via a cable to the frequency converter. Also a PC can be used instead of the control keypad, to control the frequency converter, if connected through a similar cable.
16(86) 4.2 Power ratings NX5 – Mains voltage 380—500 V 4.2.1 High overload = 200% starting torque, 2 sec/20 sec, 150% overloadability, 1 min/10 min Low overload = 150% starting torque, 2 sec/20 sec, 110% overloadability, 1 min/10 min All sizes up to and including FR8 available with IP21 enclosure and IP54 as option. Mains voltage 380-500 V, 50/60 Hz, 3~ Frequency Loadability...
4.3 Technical data Mains Input voltage U connection Input frequency Connection to mains Motor Output voltage connection Continuous output current Starting torque Starting current Output frequency Frequency resolution Control Control method characteristrics Switching frequency (See parameter 2.6.9) Frequency reference Analogue input Panel reference Field weakening point Acceleration time...
18(86) Immunity Emissions Safety Analogue input voltage Control connections Analogue input current Digital inputs (6) Auxiliary voltage Output reference voltage Analogue output Digital outputs Relay outputs Overcurrent protection Protections Overvoltage protection Undervoltage protection Earth-fault protection Mains supervision Motor phase supervision Unit overtemperature protection Motor overload...
Installation 19(86) INSTALLATION 5.1 Mounting The frequency converter can be mounted in either vertical or horizontal position on the wall or on the back plane of a cubicle. Enough space shall be reserved around the frequency converter in order to ensure a sufficient cooling, see Figure 5-6, Table 5-6 and Table 5-7. For safe installation, ensure that the mounting surface is relatively even.
H1 H2 Ø Figure 5-2. NX dimensions, IP21 with collar, FR4 to FR6 Type 0004—0015 NX_2 0003—0012 NX_5 0005—0019 NX_6 0018—0032 NX_2 0016—0031 NX_5 0022—0035 NX_6 0048—0092 NX_2 0038—0061 NX_5 0042—0085 NX_6 Table 5-2. Dimensions for different frequency converter types FR4 to FR6, IP21 with collar Installation Dimensions 21(86)
22(86) Ø Figure 5-3. The opening needed for the collar installation, FR4 to FR6 Type 0004—0015 NX_2 0003—0012 NX_5 0005—0019 NX_6 0018—0032 NX_2 0016—0031 NX_5 0022—0035 NX_6 0048—0092 NX_2 0038—0061 NX_5 0042—0085 NX_6 Table 5-3. Dimensions for the collar opening, FR4/FR5 Installation –...
Figure 5-4. NX dimensions, IP21 with collar, FR7 and FR8 Type 0120—0150 NX_2 0072—0105 NX_5 0085—0122 NX_6 0140—0205 NX_5 – Table 5-4. Dimensions for different frequency converter types FR7 and FR8, IP21 with collar Installation 630 188.5 188.5 23 – 23(86) fr7kaulusip21.fh8...
24(86) W1 W2 Ø Figure 5-5. The opening needed for the collar installation, FR7/FR8 Type 0120—0150 NX_2 0072—0105 NX_5 0085—0122 NX_6 0140—0205 NX_5 Table 5-5. Dimensions for the collar opening, FR7/FR8 Installation 188.5 188.5 – fr7aukko.fh8 34.5 – – –...
5.2 Cooling Enough free space should be left around the frequency converter to ensure sufficient air circulation and cooling. The required dimensions for free space are in the table below. If several units are mounted above each other the required free space equals C + D (see figure below).
26(86) 5.3 Power loss Power loss as function of switching frequency 5.3.1 If the operator wants to raise the switching frequency of the drive for some reason (typically e.g. in order to reduce the motor noise), this inevitably affects the output power reducing it according to the graphs below.
1400,00 1200,00 1000,00 800,00 600,00 400,00 200,00 0,00 0,00 2,00 4,00 6,00 Switching frequency [kHz] 0038NX5 400V 0038NX5 500V 0061NX5 400V 0061NX5 500V Figure 5-9. Power loss as function of switching frequency; 0038…0061NX5 2500,00 2000,00 1500,00 1000,00 500,00 0,00 0,00 2,00 4,00 0072NX5 400V...
28(86) CABLING AND CONNECTIONS 6.1 Power unit The following wiring diagrams show the mains and motor connections of the frequency converter. nk6_1.fh8 Figure 6-1. Principal wiring diagram of NX5 power unit, FR4 to FR6 *When using 1-phase supply, connect the cables to terminals L1 and L2. Cabling and connections Power board L1 L2 L3...
Cabling and connections Power board L1 L2 L3 (option) External RFI-filter (option) L1* L2* L3 nk6_2.fh8 Figure 6-2. Principal wiring diagram of NX5 power unit, FR7 *When using 1-phase supply, connect the cables to terminals L1 and L2. External filter (option) 29(86)
30(86) Power connections 6.1.1 Use cables with heat resistance of at least +60 C. The cables and the fuses must be dimensioned according to the frequency converter nominal OUTPUT current which can be found on the rating plate. Dimensioning according to the output current is recommended because the frequency converter input current never significantly exceeds the output current.
188.8.131.52 Cable and fuse sizes Frame Type 0003—0009 0012 0016 0022 0031 0038—45 0061 0072 0087 0105 0140 0168 0205 Table 6-2. Cable and fuse sizes for NX5 Cabling and connections Mains and Fuse motor cable Cu [mm 3—9 3*1.5+1.5 3*2.5+2.5 3*4+4 3*6+6...
32(86) Installation instructions 6.1.2 Before starting the installation, check that none of the components of the frequency converter are live. If the frequency converter is installed outside either a switchgear, separate cubicle or electrical room, it must be equipped with a protection cover (see e.g.
Cabling and connections Connect the cables: Strip the motor and mains cables as advised in Table 6-3 and Figure 6-3. Remove the screws of the cable protection plate. Make holes into and pass the cables through the rubber grommets on the bottom of the power unit (see e.g. Figure 6-7). Connect the mains, motor and control cables into their respective terminals (see e.g.
34(86) 184.108.40.206 Stripping lengths of motor and mains cables Earth conductor MAINS Figure 6-3. Stripping of cables Frame 0140 0168—0205 Table 6-3. Cables stripping lengths [mm] Cabling and connections Earth conductor MOTOR nk6141.fh8...
Cabling and connections 35(86) 220.127.116.11 NX frequency converter frames and installation of cables Note: To connect an external brake resistor, see separate Brake Resistor Manual. See also Chapter Internal brake resistor connection (P6.3.3) on page 69 in this manual. Figure 6-4. NX, FR4 DC-terminals Brake resistor terminals...
36(86) Cabling and connections Figure 6-6. NX, FR5. Protection class IP21 Brake resistor DC terminals terminals Earth terminals Mains cable Motor cable Figure 6-7. Cable installation in NX, FR5...
Cabling and connections 37(86) Figure 6-8. NX, FR6. Protection class IP21. Brake resistor terminals Brake resistor terminals terminals Earth terminals Earth Mains cable Motor cable Mains cable Motor cable Figure 6-9. Cable installation in NX, FR6...
38(86) Cabling and connections Figure 6-10. NX, FR7. Protection class IP21. Brake resistor terminals terminals Earth terminals Mains cable Motor cable Figure 6-11. Cable installation in NX, FR7...
Cable installation and the UL standards 6.1.3 To meet the UL (Underwriters minimum heat-resistance of +60/75 C must be used. The tightening torques of the terminals are given in Table 6-4. Type Frame NX5 0003—0012 NX5 0016—0031 NX5 0038—0061 NX5 0072—0105 NX5 0140 NX5 0168—0205 Table 6-4.
40(86) Cabling and connections 6.2 Control unit The control unit of the frequency converter consists roughly of the control board and additional boards (see Figure 6-12 and Figure 6-13) connected to the five slot connectors (A to E) of the control board.
Board A1 Board A3 in slot A in slot B NXOPTA1 NXOPTA3 Figure 6-14. The I/O terminals of the two basic boards Cabling and connections Basic I/O board NXOPTA1 nk6_13 Dotted line indicates the connection with inverted signals Figure 6-15. General wiring diagram of the basic I/O board (NXOPTA1) Figure 6-16.
42(86) 18.104.22.168 Control cables The control cables shall be at least 0.5 mm maximum terminal wire size is 2.5 mm 22.214.171.124 Galvanic isolation barriers The control connections are isolated from the mains potential and the GND terminals are permanently connected to ground. See Figure 6-17. The digital inputs are galvanically isolated from the I/O ground.
Control terminal signals 6.2.2 Terminal +10 Vref Reference voltage AI1+ Analogue input, voltage or current GND/AI1– Analogue input common AI2+ Analogue input, voltage or current GND/AI2– Analogue input common 24 Vout 24V auxiliary voltage (bidirectional) I/O ground DIN1 Digital input 1 DIN2 Digital input 2 DIN3...
44(86) 126.96.36.199 Digital input signal inversions The active signal level depends on which potential the common inputs CMA and CMB (terminals 11 and 17) are connected to. The alternatives are either +24V or ground (0 V). See Figure 6-18. The 24-volt control voltage and the ground for the digital inputs and the common inputs (CMA, CMB) can be either internal or external.
Cabling and connections Jumper block X1: AI1 mode AI1 mode: 0...20mA; Current input AI1 mode: Voltage input; 0...10V AI1 mode: Voltage input; 0...10V (differential) AI1 mode: Voltage input; -10...10V Jumper block X6: AO1 mode AO1 mode: 0...20mA; Current output AO1 mode: Voltage output; 0...10V = Factory default Figure 6-20.
46(86) CONTROL KEYPAD The control keypad is the link between the frequency converter and the user. The NX control keypad features an alphanumeric display with seven indicators for the Run status (RUN, READY, STOP, ALARM, FAULT) Keypad/BusComm). There are also three Status Indicator LEDs (green - green - red), see Status LEDs (green –...
READY = Lights when AC power is on. In case of a trip, the symbol will not light up. ALARM = Indicates that the drive is running outside a certain limit and a warning is given. FAULT = Indicates that unsafe operating conditions were encountered due to which the drive was stopped.
48(86) Text lines 7.1.4 (See control keypad) The three text lines ( , keypad menu structure as well as with information related to the operation of the drive. = Location indication; displays the symbol and number of menu, parameter etc. Example: M3 = Menu 3 (References);...
7.2 Keypad push-buttons The alphanumeric control keypad features 9 push-buttons that are used for the control of the frequency converter (and motor), parameter setting and value monitoring. Button descriptions 7.2.1 reset This button is used to reset active faults (see Chapter 7.3.4). select This button is used to switch between two latest displays.
50(86) Start button. start Pressing this button starts the motor if the keypad is the active control place. See Chapter 188.8.131.52. Stop button. stop Pressing this button stops the motor (unless disabled by parameter R3.4/R3.6). 7.3 Navigation on the control keypad The data on the control keypad are arranged in menus and submenus.
READY I/Oterm Expander boards A:NXOPTC1 " STOP R EADY I/Ote rm System Menu Application " Standard READY I/Ote rm Fault history " STOP FAULT I/Ote rm Active faults STOP R EADY I/Ote rm Control Place Keypad control " I/O Terminal R EADY I/Ote rm Parameters...
52(86) Monitoring menu (M1) 7.3.1 The monitoring menu can be entered from the main menu by pushing the button when the location indication M1 is visible on the first line of the display. How to browse through the monitored values is presented in Figure 7-4. The monitored signals carry the indication V#.# and they are listed in Table 7-1.
Parameter menu (M2) 7.3.2 Parameters are the way of conveying the commands of the user to the frequency converter. The parameter values can be edited by entering the Parameter Menu from the Main Menu when the location indication M2 is visible on the first line of the display. The value editing procedure is presented in Figure 7-5.
54(86) Control keypad Parameter lock (P6.3.2)). Return to the Main menu anytime by pressing the left arrow menu button for 1—2 seconds. The basic application package includes seven applications with different sets of parameters. The parameter lists are in the Application Section of this manual. Once in the last parameter of a parameter group, To move directly to the first parameter of that group press the Browser button...
Control keypad 55(86) READY Ke ypa d Input signals P1 " P8 READY READY Keypad Keypad Parameters Basic parameters Min Frequency " " READY READY Keypad Keypad Min Frequency Min Frequency enter 13.95 Hz 14.45 Hz Figure 7-5. Parameter value change procedure...
56(86) Keypad control menu (M3) 7.3.3 In the Keypad Controls Menu, it is possible to choose the control place, edit the frequency reference and change the direction of the motor. Enter the submenu level with the menu button. NOTE! There are some special functions that can be performed when in the M3 menu: Select the keypad as the active control place by keeping the pushed down for 3 seconds when the motor is running.
STOP READY I /Oterm Keypad control " STOP READY I/ Oterm Control Place Keypad Figure 7-6. Selection of control place 184.108.40.206 Keypad reference The keypad reference submenu (P3.2) displays and allows the operator to edit the frequency reference. The changes will take place immediately. This reference value will not, however, influence the rotation speed of the motor unless the keypad has been selected as the active control place.
58(86) Active faults menu (M4) 7.3.4 The Active faults menu can be entered from the Main menu by pushing the button when the location indication M4 is visible on the first line of the keypad display. When a fault brings the frequency converter to a stop, the location indication F1, the fault code, a short description of the fault and the fault type symbol (see Chapter 220.127.116.11) will appear on the display.
Control keypad 59(86) Fault type symbol Meaning This type of fault is a sign of an unusual operating (Alarm) condition. It does not cause the drive to stop, nor does it require any special actions. The 'A fault' remains in the display for about 30 seconds.
60(86) 18.104.22.168 Fault codes The fault codes, their causes and corrective actions are presented in the table below. The shadowed faults are A faults only. The faults written in white on black background may appear as both A and F fault. Fault Fault code...
Fault Fault code Motor Motor overheating has been detected by overtemperature frequency converter motor temperature model. Motor is overloaded. Motor underload Motor underload protection has tripped. EEPROM Parameter save fault checksum fault faulty operation component failure Changed data Changes may have occurred in the warning different counter data due to mains interruption...
62(86) 22.214.171.124 Fault time data record When a fault occurs the information described above in 7.3.4 is displayed. By pushing the it is possible to view the Fault time data record menu indicated by T.1# # # # T.13. arrow menu button In this menu, some selected important data valid at the time of the fault are recorded.
Fault history menu (M5) 7.3.5 The Fault history menu can be entered from the Main menu by pushing the button Menu button right when the location indication M5 is visible on the first line of the keypad display. All faults are stored in the Fault history menu, Browse through them using the Additionally, the Fault time data record pages (see Chapter 126.96.36.199) are accessible at each fault.
64(86) Control keypad System menu (M6) 7.3.6 The System menu can be entered from the main menu by pushing the right arrow menu button Menu button right when the location indication M6 is visible on the display. The controls associated with the general use of the frequency converter, such as application selection, customised parameter sets or information about the hardware and software are located under the System menu.
Functions in the System menu Code Function S6.1 Application selection S6.2 Language selection S6.3.1 Password P6.3.2 Parameter lock Internal brake P6.3.3 resistor P6.3.4 Fan control P6.3.5 Multimonitoring page HMI acknowledg. P6.3.6 timeout HMI number of P6.3.7 retries P6.4.1 Default page Default page/ P6.4.2 Operating menu...
188.8.131.52 Application selection The user can select the application desired by entering the Application selection page (S6.1). This is done by pushing the right arrow menu button Change the application by pushing the application starts to blink. Browse through the applications with the another application with the Enter In this phase, the display requests whether theparameters of the new application are to be...
68(86) I/O term System Menu " I/Oterm Language English Figure 7-10. Selection of language 184.108.40.206 System settings In the System settings submenu (S6.3) under the System menu it is possible to further customise the frequency converter operator interface. The functions available in this menu are Password, Parameter lock, Internal brake resistor connection, Fan control, HMI acknowledge timeout and HMI retry.
Parameter lock (P6.3.2) This function allows the user to prohibit changes to the parameters. If the parameter lock is activated the text *locked* will appear on the display when the parameter value is edited. NOTE: This function does not prevent unauthorised editing of parameter values. Enter the edit mode by pushing the Use the Browser buttons...
70(86) READY I/Oterm System Menu " READY I/Oterm InternBrakeRes Connected Figure 7-13. Internal brake resistor connection Fan control (P6.3.4) This function allows the control of the frequency converter’s cooling fan. When the power is switched on the fan can be set to run continuously or dependant on the temperature of the unit. If the latter function has been selected the fan is switched on automatically when the heat sink temperature reaches 60 C.
Example: Transfer delay between the frequency converter and the PC = 600 ms The value of par. 6.3.6 is set to 1200 ms (2 x 600, sending delay + receiving delay) The corresponding setting shall be entered to the NCDrive.ini – file: Retries = 5 AckTimeOut = 1200 TimeOut = 6000...
72(86) I/Oterm Keypad settings Figure 7-16. Keypad settings submenu Default page (P6.4.1) This menu allows the user to set the location (page) to which the display automatically moves as the Timeout time (see below) has expired or as the power is switched on to the keypad. If the Default Page value is 0 the function is not activated, i.e.
Contrast adjustment (P6.4.4) In case the display is unclear adjust the contrast through the same procedure as that for the timeout time setting (see above). Backlight time (P6.4.5) Giving a value for the Backlight time, can determine how long the backlight stays on before going out.
74(86) Download parameters to drive (From keypad, S6.5.2) This function downloads one or all parameter groups uploaded to the keypad to a drive provided that the drive is in STOP status. Enter the From keypad page (S6.5.2) from the Parameter copy menu. Push the button to enter the edit mode.
If the user wants the parameters of the new application to be automatically uploaded to the keypad this will have to be done for the parameters of the new application once on page 6.5.1 as instructed. Otherwise the panel will always ask for the permission to upload the parameters. Note: Parameters saved in the parameter settings on page S6.5.3 will be deleted when applications are changed If transfer of the parameters from one application to another is required, they must be uploaded first to the keypad.
76(86) 220.127.116.11 Information submenu In the Information submenu (S6.7) frequency converter-related hardware and software information as well as operation-related information, can be found. Enter the Info menu by pressing the the information pages with the Page 6.7.1 Nominal power of the unit (constant torque) 6.7.2 Nominal voltage of the unit 6.7.3...
Applications info submenu (S6.7.6) At location S6.7.6 is the Applications submenu containing information about not only the application currently in use but also all other applications loaded into the frequency converter. The information available is: 1. Application identification number 2. Application version number 3.
78(86) 18.104.22.168 Trip counters submenu Trip counters (menu S6.9) are counters the values of which can be reset i.e. restored to zero. The following resettable counters are available: Note! The trip counters run only when the motor is running. Page Counter T6.9.1.
Expander board menu (M7) 7.3.7 The Expander board menu makes it possible for the user 1) to see what expander boards are connected to the control board and 2) to reach and edit the parameters associated with the expander board. Enter the following menu level (G#) with the browse through slots (see page 40) A to E with the are connected.
80(86) Control keypad 7.4 Further keypad functions The NX control keypad embodies additional application-related functions. See the NX Application Package for more information.
COMMISSIONING 8.1 Safety Before commissioning, note the following directions and warnings: Internal components and circuit boards of the frequency converter (except for the galvanically isolated I/O terminals) are live when the NX is connected to mains potential. Coming into contact with this voltage is extremely dangerous and may cause death or severe injury.
82(86) Set the parameters of group 1 (See the Application Manual) according to the requirements of the application. At least the following parameters should be set: motor nominal voltage motor nominal frequency motor nominal speed motor nominal current The values needed for the parameters are on the motor rating plate. Perform run test without motor Perform either Test A or Test B: A Controls from the I/O terminals:...
Commissioning 83(86) 10 Connect the motor to the process (if the startup test was run without the motor being connected) a) Before running the tests, make sure that this can be done safely. b) Inform co-workers of the tests. c) Repeat test 8A or 8B.
84(86) FAULT TRACING When a fault is detected by the frequency converter control electronics, the drive is stopped and the symbol F together with the ordinal number of the fault, the fault code and a short fault description appear on the display. The fault can be reset with the keypad or via the I/O terminal.
Frequency Heatsink temperature is over 90 C. converter over temperature Over temperature warning is issued when the heatsink temperature exceeds 85 C. Motor stalled Motor stall protection has tripped. Motor Motor overheating has been detected by overtemperature frequency converter motor temperature model.