Danfoss VLT AutomationDrive FC 300 Design Manual page 73

Selection
•
Temperature monitoring of the heatsink ensures that the frequency converter trips if the temperature reaches a
pre-defined level. An overload temperature cannot be reset until the temperature of the heatsink is below the
values stated in the tables on the following pages. Note that these temperatures may vary for different power
sizes, frame sizes, enclosure ratings etc.
•
The frequency converter is protected against short-circuits on motor terminals U, V, W.
•
If a mains phase is missing, the frequency converter trips or issues a warning depending on the load.
•
Monitoring of the intermediate circuit voltage ensures that the frequency converter trips if the intermediate circuit
voltage is too low or too high.
•
The frequency converter constantly checks for critical levels of internal temperature, load current, high voltage on
the intermediate circuit and low motor speeds. As a response to a critical level, the frequency converter can adjust
the switching frequency and/or change the switching pattern in order to ensure the performance of the frequency
converter.
Digital Inputs
Programmable digital inputs
Terminal number
Logic
Voltage level
Voltage level, logic'0' PNP
Voltage level, logic'1' PNP
2)
Voltage level, logic '0' NPN
2)
Voltage level, logic '1' NPN
Maximum voltage on input
Pulse frequency range
(Duty cycle) Min. pulse width
Input resistance, R
i
Safe Torque Off Terminal 37 3, 4)
Voltage level
Voltage level, logic'0' PNP
Voltage level, logic'1' PNP
Maximum voltage on input
Typical input current at 24 V
Typical input current at 20 V
Input capacitance
All digital inputs are galvanically isolated from the supply voltage (PELV) and other high-voltage terminals.
1)
Terminals 27 and 29 can also be programmed as output.
2) Except Safe Torque Off input Terminal 37.
3)
For more information on terminal 37 and Safe Torque Off, see 3.12 Safe Torque Off.
4)
When using a contactor with a DC coil inside in combination with Safe Torque Off, it is important to make a return way for
the current from the coil when turning it off. This can be done by using a freewheel diode (or, alternatively, a 30 or 50 V MOV for
quicker response time) across the coil. Typical contactors can be bought with this diode.
Analog Inputs
Number of analog inputs
Terminal number
Modes
Mode select
Voltage mode
Voltage level
Input resistance, R
i
Max. voltage
Current mode
Current level
Input resistance, R
i
®
VLT AutomationDrive FC 300 Design Guide 90-1200 kW
(Terminal 37 is fixed PNP logic)
Switch A53 and A54 (D-Frame) S201 and S202 (E & F-Frames)=OFF (U)
Switch A53 and A54 (D-Frame) S201 and S202 (E & F-Frames)=ON (I)
MG34S202 - Rev. 2013-08-19
Switch A53 and A54 (D-Frame) S201 and S202 (E & F-Frames)
1)
4 (6)
1) 1)
18, 19, 27 , 29 , 32, 33
PNP or NPN
0-24 V DC
<5 V DC
>10 V DC
>19 V DC
<14 V DC
28 V DC
0-110 kHz
4.5 ms
approx. 4 kΩ
0-24 V DC
<4 V DC
>20 V DC
28 V DC
50 mA rms
60 mA rms
400 nF
2
53, 54
Voltage or current
-10 to +10 V (scaleable)
approx. 10 kΩ
± 20 V
0/4 to 20 mA (scaleable)
approx. 200 Ω
71
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