Delta Foul V3 Installation And Operating Manual page 37

7.2.1.2 Checking the power cables
Visual inspection
The pump set has been lifted out of the pump sump and cleaned.
✔
1. Inspect the power cables for visible damage.
2. Replace any damaged components by original spare parts.
Checking the earth conductor
The pump set has been lifted out of the pump sump and cleaned.
✔
1. Measure the resistance between the earth conductor and chassis ground.
The electrical resistance must be lower than 1 Ω.
2. Replace any damaged components by original spare parts.
DANGER
7.2.1.3 Measuring the insulation resistance
Measure the insulation resistance of the motor winding during annual
maintenance work.
The pump set has been disconnected in the control cabinet.
✔
Use an insulation resistance measuring device.
✔
The recommended measuring voltage is 500 V
✔
(maximum permissible voltage: 1000 V).
1. Measure the winding to chassis ground. To do so, connect all winding ends
together.
The insulation resistance of the core ends to chassis ground must not be
 
lower than 1 MΩ. If the resistance measured is lower, power cable and motor
resistance must be measured separately. Disconnect the power cable from
the motor for this purpose.
NOTE
Delta Foul V3 Submersible Pump
Defective earth conductor
Electric shock!
 Never switch on a pump set with a defective earth conductor.
If the insulation resistance of the power cable is lower than 1 MΩ, the power cable
is defective and must be replaced.
If the insulation resistances measured on the motor are too low, the winding
insulation is defective. The pump set must not be returned to service in this case.
7 Servicing/inspection
Installation and operating manual 37 of 56