Siemens 125-2134 - CV Controller Pressure Mode Output Check; Equipment Required; DPM Without a Pressure Mode Key Switch; Procedure if DO MODE Is Set to NOPEN

Chapter 4 – Troubleshooting
CV Controller Pressure Mode Output Check
To check if the CV Controller Pressure Mode Output is functioning properly, follow these
steps.
Equipment required
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Multimeter (digital or analog)
Portable Operator’s Terminal (POT) and cable.
DPM without a Pressure Mode Key Switch
1. Connect the POT to the monitor’s communication port. If you are unable to establish
communication with the monitor, contact your local Siemens Building Technologies
representative.
2. Turn the meter on and set it to monitor resistance (ohms, Ω).
3. Select the Start Up report from the Reports Menu.
4. Scroll so that the display shows POS.NEG (Point 25), ACTIVE.NTRAL (Point 10),
and DO MODE (Point 33).
Procedure if DO MODE is set to NOPEN.
1. Set POS.NEG to POS, ACTIVE.NTRAL to NTRAL, and DO MODE to NOPEN.
2. Connect the meter to pins 9 and 10. See Figure 7.
The meter should indicate an open circuit. If the meter does not change in value,
contact your local Siemens Building Technologies representative.
3. Set ACTIVE.NTRAL to ACTIVE.
The meter should indicate a short circuit. If the meter does not change in value,
contact your local Siemens Building Technologies representative.
4. Set POS.NEG to NEG.
The meter should indicate an open circuit. If the meter does not change in value,
contact your local Siemens Building Technologies representative.
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