Troubleshooting; Check For An Earth Fault In The Sensor Circuit; Check Which Sensor Tripped The Leakage Alarm - Xylem FLYGT MiniCAS II Installation, Operation And Maintenance Manual

6 Troubleshooting

Precautions
Before starting work, make sure that the safety instructions in the chapter
Safety
DANGER: Electrical Hazard
Troubleshooting a live control panel exposes personnel to hazardous voltages. Electrical
troubleshooting must be done by a qualified electrician.
DANGER: Electrical Hazard
Before starting work on the unit, make sure that the unit and the control panel are isolated
from the power supply and cannot be energized. This applies to the control circuit as well.

6.1 Check for an earth fault in the sensor circuit

1. Measure between the T1 wire and ground (earth).
2. Measure between the T2 wire and ground (earth).
3. When the value is lower than one megaohm, inspect the circuit wiring in the pump.
A lower value indicates an earth fault.

6.2 Check which sensor tripped the leakage alarm

The sensor circuit has a CLS and FLS connected.
1. Select one of the following steps to disconnect the power to the relay:
2. Measure the time for the leakage alarm to trip from the moment the relay is powered.
MiniCAS II Installation, Operation, and Maintenance Manual
(page 2) have been read and understood.
Condition
No pump runs.
The second pump in a dual pumping station
runs.
Delay time
10 s
15 s
T1
+
T2
Ω
−
T1
+
T2
−
Ω
Action
Switch off the power to the control panel and switch it back on.
Pull out the relay from the socket and insert it back.
Sensor tripping the alarm
FLS
CLS
6 Troubleshooting
Introduction and
11