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11 Insulation resistance
Do not measure the insulation resistance of motor windings or an installation
incorporating motors with integrated frequency converters using high-voltage
megging equipment, as this may damage the built-in electronics.
12 Maintenance
Before starting work on the product, switch off the power supply for at least 5 min-
utes. Make sure that the power supply cannot be accidentally switched on.
12.1 Pumps
Pump bearings and shaft seals are maintenance-free. If HP-E or HPC-E pumps are to be
drained for a long period of inactivity, remove one of the coupling guards to inject a few drops
of silicone oil on the shaft between the pump head and the coupling. This will prevent the shaft
seal faces from sticking.
12.2 Motors
Keep motor cooling fins and fan blades clean to ensure sufficient cooling of the motor and
electronics.
12.3 Breaker cabinet
The breaker cabinet is maintenance-free. Keep it clean and dry.
12.4 Inlet pressure in the pressure vessel with a membrane lining
We recommend checking the air pressure in the pressure vessel with a membrane lining
approximately every three months.
13 Shutdown
Shut down the system with the main switch in the breaker cabinet.
The wires in front of the main switch are still
energised.
To shut down a pump, switch off the circuit breaker of the pump.
13.1 Frost protection
If pumps are not used during periods of frost, they must be drained to avoid damage.
Drain the pump by loosing the air vent screw in the pump head and remove the drain plug from
the base.
Do not tighten the air vent screw and refit the drain plug until the system is to be used again..
