NOTE
If the insulation resistance for one of the power supply cables is less than 1 MΩ, the
cable is defective and must be replaced.
NOTE
If the insulation resistance values measured on the motor are too low, the winding
insulation is defective. The pump set must not be returned to service in this case.
7.2.1.4 Checking the sensors
CAUTION
Excessive test voltage
Damage to the sensors!
▷
Never test the sensors with voltages exceeding 30 V.
The tests described below measure the resistance at the conductor ends of the
control cable. The actual sensor function is not tested.
Table 16: Resistance measurement bimetal switch in the motor
Measurement between terminals ...
Resistance
20 and 21 an between 21 and 22
< 1 Ω
If the specified tolerances are exceeded, disconnect the power cable at the pump set
and repeat the check inside the motor.
If the tolerances are exceeded here, too, the motor section has to be opened and
overhauled. The temperature sensors are fitted in the stator winding and cannot be
replaced.
Table 17: Measuring the resistance of the leakage sensor in the motor
Measurement between terminals ...
Resistance
9 and earth conductor (PE)
> 1 Ω
Lower resistance values suggest water ingress into the motor. In this case the motor
must be opened and overhauled.
7.2.2 Lubrication and lubricant change
7.2.2.1 Lubricating the mechanical seal
The mechanical seal is supplied with lubricant from the lubricant reservoir.
7.2.2.1.1 Intervals
Change the lubricant every 4000 operating hours but at least once a year.
7.2.2.1.2 Lubricant quality
The lubricant reservoir is filled at the factory with an environmentally friendly, non-
toxic lubricant of medical quality (unless otherwise required by the customer).
The following lubricants can be used for lubricating the mechanical seals:
▪
Thin-bodied paraffin oil; made by Merck, No.: 7174
▪
Merkur white oil Pharma 40; made by DEA
▪
Equivalent brand of medical quality, non-toxic
▪
Water-glycol mixture
▪
All non-doped and doped motor oils of classes SAE 10W to SAE 20W
Bimetal switch in the
motor
Leakage sensor in the
motor
Recommended quality of
lubricant
Alternative:
7 Servicing/Maintenance
Amarex® N
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Goodnal STP ST041 Biological Treatment (KSB WAS PUMP 1 & 2 PU-0530-010 OM Instructions) Vendor Manual
Q-Pulse Id VM381
Active 29/10/2013
Page 41 of 76
