Troubleshooting
40
GA 05.136/2.02 - 10/98
Failure Message on
Display
Motor Temp.
Temperature sensor inside
the motor reads a higher
temperature value than the
failure threshold (100
°
C).
Bearing Temp.
Temperature sensor inside
the pump reads a higher
temperature value than the
failure threshold (70
°
C).
Converter Temp.
Temperature sensor inside of
the converter reads a higher
temperature value than the
failure threshold (90
°
C).
Measures
Acknowledge failure message.
Take the actual motor temperature reading from the
display; see Section 4.3.1.
Reduce gas load. If the warning persists contact
Leybold service.
Step 1: Check pump (temperature sensor)
Check pump connector X23. In particular measure
resistance between pins X23/x and X23/w. The
resistance is typically 2k
Ω
± 1 %. In case of abnor-
mal values (> 3.4 k
Ω
) are measured contact Ley-
bold service.
Step 2: Check BEARING cable
If step 1 was successful do the following:
Check BEARING cable for bent pins
Measure the resistance between pins X20/x and
X20/w with the cable connected to the pump. The
resistance is typically 2k
Ω
± 1 %.
Replace the cable if it is damaged or in case the
measurement of the resistance shows abnormal
values (> 3.4 k
Ω
) now.
Contact Leybold service.
Apply cooling water according to specifications.
Check cooling water tubes for deposits. See also
Section 2.6.
Allow pump to cool down between the cycles.
Step 1: Check pump (temperature sensor)
Check pump connector X23. In particular measure
resistance between pins X23/v and X23/u as well
as between pins X23/v and X23/t. The resistance is
typically between 110
Ω
and 130
Ω
(20
°
C to 70
°
C). In case abnormal values are measured contact
Leybold service.
Step 2: Check BEARING cable
If step 1 was successful do the following:
Check BEARING cable for bent pins
Measure the resistance between pins X20/v and
X20/u as well as between pins X20/v and X20/t
with the cable connected to the pump. The resi-
stance is typically between 110
Ω
and 130
Ω
(20
°
C to 70
°
C).
Replace the cable if it is damaged or in case the
measurement of the resistance shows abnormal
values now.
Contact Leybold service.
Allow converter to cool down between the cycles.
Refer to Section 2.8 for the correct mounting of the
converter in a rack; max. ambient temperature 45
°
C.
Contact Leybold service.
Possible Cause
Motor temperature exceeds the failu-
re threshold e.g. due to a high gas
load.
Motor temperature sensor defective.
BEARING cable or connector dama-
ged.
Converter failure.
Cooling water flow too low or cooling
water temperature too high.
Frequent acceleration and decelerati-
on of the pump.
Pt 100 (temperature sensor bearing)
damaged.
BEARING cable or connectors dama-
ged.
Converter failure.
Frequent acceleration and decelerati-
on of the pump.
No sufficient air circulation.
Converter failure.
6.2 Failure messages
