STATUS SCIENTIFIC CONTROLS MCU3 - Alternative Detector Heads

STATUS SCIENTIFIC CONTROLS
MCU System Installation and Hardware Configuration Manual
TD06/001
Issue:
6
Change Note:
1696
Page 4-7
4.1.2 Alternative Detector Heads
The MCU Control Units have been designed to accommodate detector heads built by other
manufacturers; section 4.1.2 shows the relevant diagrams and procedures.
4.1.2.1 4-20mA Sink to Ground Using Internal PSU
Connection Procedure
• Disconnect power from the system.
• Remove the grey protective cover from the associated input module.
• Configure the jumper switches as shown below (i.e. J6, J7, J10, J12, J13 and J14
switched ON, all others OFF)
• Connect a voltmeter between pins 22 (+V) and pin 24 (0V) of PL1.
• Connect power to the system.
• Adjust VR1 and VR2 until the appropriate voltage is observed on the meter, typically 22V
2V. Consult detector head instructions for recommended supply voltage.
• Disconnect power from the system.
• Connect the wires from the detector head to PL1 on the input module observing the
following:
Detector Head
PL1 Pin Number
-
23
+
22
• Connect power to the system and ensure the detector head operates.
• Refit grey protective cover.
• Perform software configuration (refer to ‘MCU Software Configuration and System
Calibration Manual’).
• Perform system calibration. Refer to ‘MCU Software Configuration and System Calibration
Manual’ and detector head manufacturers instructions.
J12 J11 J10
J9 J8 J7 J6
J14
J13
- +
4-20mA Loop
PL1
Terminals
0V
21
22
23
24
Current
Sensing
Circuit
Variable
Voltage
Output
This configuration allows a detector head to be powered directly from the
MCU with the loop current sensing components situated in the return
path to 0V.