Siemens SIMOTICS HV M - Cooling System Faults; Table 8-4 Cooling System Faults; Table 8-5 Cooling System Faults

8.11.5 Cooling system faults
The following table shows the possible causes of and remedial measures for faults on forced-
ventilated machines.
Table 8-4 Cooling system faults
↓ High temperature rise with load
Possible causes of faults Remedial measures
X Wrong direction of rotation of the external fan Check the electrical connections to the external fan.
X External fan is not running Check the external fan and its connections.
X Reduced air flow Check the air ducts; clean the machine.
8.11.6 Cooling system faults
The following table shows the possible causes of and remedial measures for faults on water-
cooled machines.
Table 8-5 Cooling system faults
↓ High temperature rise
↓ Water leaking
Possible causes of faults Remedial measures
X Reduced cooling Check the cooling water flow, increase the amount of cooling water if
necessary
X Cooling water flow rate too low Clean the air-to-water heat exchanger.
X Inlet temperature too high Set the correct upstream temperature.
X Cooling water supply switched off Switch on the cooling water supply.
X Cooling water contains frost or anti-corro‐
sion additives
Use cooling water of the agreed quality.
X X Defective cooling water pipes / defective
cooling water connection
Locate the leaky section and seal it or consult the manufacturer.
Operation
8.11 Faults
SIMOTICS HV M 1RN76308PR900CG0-Z
Operating Instructions 07/2018 85