Air-To-Water Cooler Faults; Table 8-3 Cooling System Faults - Siemens SIMOTICS FD 1LN1 Operating Instructions & Installation Instructions

Operation
8.10 faults
↓ Grinding noise
↓ Overheating
↓ Radial vibrations
↓ Axial vibrations
Possible causes of faults
X X Poor alignment
X Coupled machine not balanced
X Shocks from coupled machine
X X Resonance of the overall system comprising mo‐
tor and foundation
X X Changes in foundation
X Reduced air supply, direction of rotation of fan
possibly incorrect
X X Uneven gearbox operation
Take into account possible changes which may occur during overheating.
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8.10.4

Air-to-water cooler faults

The following table shows the possible causes of and remedial measures for faults on water-
cooled machines.
Table 8-3 Cooling system faults
↓ High temperature rise
↓ Water leaking
Possible causes of faults
X Reduced cooling
X Cooling water flow rate too low
X Inlet temperature too high
X Cooling water supply switched off
X Cooling water contains frost or anti-corro‐
sion additives
X X Defective cooling water pipes / defective
cooling water connection
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Remedial measures
Align the machine set and check the coupling.
Rebalance the coupled machine.
Examine the coupled machine.
Reinforce the foundation after prior consultation with the
Service Center.
Determine the cause of the changes and, if necessary,
rectify. Realign the machine.
Check the air ducts; clean the machine.
Resolve any gearbox faults.
Remedial measures
Check the cooling water flow, increase the amount of cooling water if
necessary
Clean the air-to-water heat exchanger.
Set the correct upstream temperature.
Switch on the cooling water supply.
Use cooling water of the agreed quality.
Locate the leaky section and seal it or consult the manufacturer.
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SIMOTICS FD 1LN1
Operating Instructions 01/2019