Prepare The Subcab ™ Cables - Xylem FLYFT P7900 Installation, Operation And Maintenance Manual

4 Installation
Labels are attached to the SUBCAB cable which is used for communication when there is
more than one SUBCAB cable. This section gives instructions for identifying which cable is
used for communication, when the label is missing.
A multimeter can be used to identify the following:
• Which signal leads are connected to the PEM
• For explosion-proof pumps: which leads are connected to the thermal contacts or
thermistors
Unused leads in the pump are isolated.
4.5.6.1 Measure the resistance
At the PEM, T1 is + and T2 is −.
1. Select a SUBCAB cable.
2. Use a multimeter to measure the resistance across T1–T2.
Measure both polarities.
3. Ex-proof pumps only: Use a multimeter to measure the resistance across T3–T4.
4. Repeat this process on the other cables until the signal leads which are used for
communication, have been identified.
4.5.7 Prepare the SUBCAB
This section applies to SUBCAB
34
T1–T2 resistance
70–130 kilohms
∞ ohm: infinite resistance
T3–T4 resistance
∞ ohm
0–5 ohm
150–300 ohm
™
cables
T1–T2 resistance
Opposite polarity
∞ ohm
∞ ohm
Stator temperature sensors
The T3–T4 signal leads of this cable are not
used.
Thermal contacts are connected to this cable.
Thermistors are connected to this cable.
™ cables with twisted-pair control conductors.
P7900 Installation, Operation, and Maintenance Manual
Conclusion
The PEM is connected to this
cable.
The PEM is not connected to
this cable.