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3320250 / 2
Installation and Maintenance Instructions
888888
Printed in the UK
IM-P332-07 MI Issue 2
M750
Display Unit
1 2 3 4
Vac Tag No
1. General
safety information
2. General
product information
3. Installation
4. Commissioning
5. Spare parts
6. Fault finding
© Copyright 2004
IM-P332-07
MI Issue 2
1
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Table of Contents
Related Manuals for Spirax Sarco M750
Summary of Contents for Spirax Sarco M750
- Page 1 3320250 / 2 IM-P332-07 MI Issue 2 M750 Display Unit Installation and Maintenance Instructions 1. General 888888 safety information 1 2 3 4 2. General product information Vac Tag No 3. Installation 4. Commissioning 5. Spare parts 6. Fault finding...
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Page 2: General Safety Information
1. General safety information Your attention is drawn to any National or local regulations. Safe operation of the product depends on it being properly installed, commissioned and maintained by a qualified person in compliance with these operating instructions. The product is designed and constructed to withstand the forces encountered during normal use. -
Page 3: General Product Information
The unit can be used 'stand alone' or, with the Modbus serial communications, as part of a larger system. Option Pods may be plugged into the M750 base unit, without the need for dismantling or re-calibration, to allow the output from the M750 to be tailored to a specific application. -
Page 4: Mechanical Installation
(for the installation of instrumentation used in the process control systems), issued by a recognized local body. 3.1 Mechanical installation Ensure that the panel has sufficient depth to install the M750 and its wiring, including the space required to withdraw the wiring connectors. Rear elevation Fig. -
Page 5: Electrical Installation
3.2 Electrical installation All connections are made to sockets, which are removable for ease of maintenance and wiring. Cable size should be between 0.5 mm² (0.02"²) and 1.5 mm² (0.06"²). Supply - The supply terminals and associated internal circuitry are isolated from all other parts of the equipment in accordance with BS EN 61010-1, for connection to an Installation over- voltage Category supply, (pollution degree 2). - Page 6 Fig. 5 Sensor connection wiring details: Warning: Remove power to the unit before connecting the sensor input. Voltage Current Active This is for use with 4- 20 mA devices that (For self - powered are self -powered or powered from an 4 - 20 mA devices) external power supply.
- Page 7 To remove an Option Pod, press the bar below the Pod connector and at the same time pull the Pod upwards. 1. Lift pod upwards. 2. Press and hold the back of the cover Fig. 7 Removal of option pod Dual relay pod The relay terminals and associated internal circuitry are isolated from all other parts of the equipment in accordance with BS EN 61010-1, for connection to an Installation over-voltage...
- Page 8 Fig. 9 Pod wiring diagram Power off Power on Relay sense set to 'nOnInV' Unit not in alarm Power on Relay sense set to 'nOnInV' Unit in alarm Power on Relay sense set to 'InVErt' Unit not in alarm Power on Relay sense set to 'InVErt' Unit in alarm IM-P332-07 MI Issue 2...
- Page 9 Isolated 4-20 mA re- transmission pod The re- transmission pod (when fitted) is designed to provide 0- 10 mA, 0-20 mA or 4-20 mA output in active or passive modes. The output can be any proportion of the display range. The pod can be used in two modes (see Figure 10).
- Page 10 6413). Note: Twisted pair cable should not be required for short lengths of cable < 1.5 m (< 5 ft). Standard screened cable should suffice. Using one twisted pair, connect the M750 positive terminals to the positive wire of bus and the negative terminals to the negative wire of the bus.
- Page 11 6414). Note: Twisted pair cable should not be required for short lengths of cable < 1.5 m (< 5 ft). Using one twisted pair, connect the M750 + Tx and -Tx terminals to the +Rx and -Rx wires of the bus respectively. Standard screened cable should suffice.
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Page 12: Technical Data
3.4 Technical data (@ 20°C) General 90-264 Vac 50 /60 Hz 90-253 Vac 50 /60 Hz for compliance with LVD and UL Power supply BS EN 61010-1 for connection to an installation over-voltage Category supply Pollution degree 2 Power consumption 10 VA (worst case) 500 V Isolation (tested to) -
Page 13: Instrument Configuration
Termination standard RS485 3.5 Instrument configuration The M750 is configured using the three keys on the front panel. The M750 has two modes of operation: 1) The 'Run' mode. This mode is automatically entered 5 seconds after the power is applied to the M750. -
Page 14: Menu Mode
Fig. 16 3.6 Menu mode This menu configures the M750 to suit the application. The menu covered in this section is the menu structure for all applications. For commissioning the M750 for operation with Spirax Sarco flowmeters see Section 4. - Page 15 From Run mode InPUt The input sub-menu is where the input to the M750 is selected and configured. OUt 1 Output configures the outputs of the M750. The format of the output menu varies according to the Output Pod fitted. The two possible output types are: 1) Current retransmission.
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Page 16: Input Sub-Menu
3.9 Input sub-menu Fig. 19 InPUt tYPE VOLt CUrrEnt Input type Voltage Thermocouple Current Displayed if voltage input is selected. ± 10 V ± 1 V ± 5 V ± 1-5 V ± 100 mV rAnge Range 4-20 Displayed if current 4-20 mA ±... - Page 17 Stndrd Auto ScALE Standard manual Auto scaling Scaling method scaling applies applies Eng LO Enter value Engineering low Eng HI Enter value Engineering high Lo VAL APPLy Apply auto scale Enter value APL Lo Apply electrical input low Enter value HI VAL Enter value APL HI...
- Page 18 This is set in engineering units and for flowmeters it is generally the minimum flow measurable. Display variable This sets the main display shown by the M750 in the run mode. It can be set to show the rate, total or alternate between both. Scale The primary function of the M750 is to take an electrical input, and convert it to a displayable Process Variable (PV, also referred to as an engineering value, e.g.
- Page 19 3. The display will flash 'APL LO' to prompt the user to apply the electrical signal corresponding to PV_lo. If the electrical signal goes out of range, the display signifies this, and the input signal won’t be accepted by the M750. This applies electrical signal equates to input_lo, in the graph /table above.
- Page 20 Total divider /factor / time base Factor, divider and time base are used to scale the amount by which the total is incremented every second. The total added every second is: (rate x factor)/(time base x divider), where time base is = 1, 60, or 3600 seconds. The total displayed has a maximum number of 12 digits.
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Page 21: Alarm Action
The relay menu shown is for alarm A. There are two alarms A and B so the menu will be duplicated for alarm B. The relay menu will only be displayed if a twin relay pod is fitted to the M750. -
Page 22: Alarm Delay
Low alarm Hysteresis Set point Hysteresis Triggered Fig. 23 Alarm function Not triggered Deviation alarm Hysteresis Deviation Set point Deviation Hysteresis Triggered Fig. 24 Alarm function Not triggered Alarm delay The alarm will not trigger until the PV has been in the alarm region for more than the number of seconds set in this option. - Page 23 Relay sense The 'InVrt' setting refers to the relay sense during powered operation. All other relay output menu settings refer to the alarm state. When in alarm, the relevant front panel LED is lit. Power Alarm status InVrt setting Relay position (A) Relay position (B) Not in Alarm nOnInV In Alarm...
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Page 24: System Menu
3.13 System menu The system menu allows the communications to and from the device to be configured and also allows various functions to be enabled from the run mode. The passcode can also be changed from within this menu. SyStEn System AddrES Enter value... - Page 25 'FULL' menu type should be chosen. Start- up delay time The outputs of the M750 will not operate until the start-up delay time (measured in seconds) has expired. The minimum delay is 5 seconds and the maximum 3 600 seconds.
- Page 26 4. Commissioning The following Section provides guidance on the commissioning of the M750 for use with Spirax Sarco flowmeters. The Section covers the DIVA, Vortex, Gilflo, ILVA and orifice plate flowmeters. 4.1 DIVA flowmeter, Vortex flowmeter and M640 mass transmitter The DIVA flowmeter, Vortex flowmeter and M640 mass transmitter provide a linear 4-20 mA output representing flowrate.
- Page 27 4.2 Gilflo and ILVA flowmeters Before commissioning the M750 for use with a Gilflo or ILVA flowmeter a custom calibration pack must be obtained from Spirax-Sarco Limited. This will provide the 4-20 mA output from the DP cell versus the flowrate through the flowmeter in the flowing conditions. As an...
- Page 28 4.3 Orifice plates An orifice plate has a square root relationship between the DP output and flowrate. To commission the M750 to operate with these units, the following steps should be followed in conjunction with the general menu structure in Section 3.9.
- Page 29 4.4 M750 outputs The menu displayed depends upon the option pod fitted to the M750. To commission the M750 outputs, the following steps should be followed in conjunction with the general menu structure in Section 3.9. Relay output menu The relay outputs can be set to operate as simple alarms or a pulsed output. There are two relay outputs per pod.
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Page 30: Spare Parts
Retransmission (mA) output menu The following menu details the setting of the 4-20 mA output on the M750 to give a 4-20 mA output equivalent to the range of the attached flowmeter. rEtrAn tyPE mA output scaled to Rate is generally chosen... -
Page 31: Fault Finding
6. Fault finding Many faults, which occur on commissioning, are found to be due to incorrect wiring or commissioning. Therefore it is recommended that a thorough check is carried out should there be a problem. Symptom Possible cause Action Display is blank Voltage is out of range. - Page 32 IM-P332-07 MI Issue 2...
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