8 | Maintenance
38 / 49 Hidrostal AG
• Protective clothing
• Hard hat
• Safety shoes
Prerequisites:
• Make sure that Preparation tasks for maintenance [▶31] has been
carried out first.
8.4.5.1 Checking the suitability of the replacement pump
• Make sure that the replacement pump is not damaged.
• Make sure that the information on the type plates of the defective pump
and the replacement pump are identical. If you are unsure, contact the
supplier.
• Make sure that the cable harness of the defective pump and the
replacement pump is identical (compare the wiring diagram of the
defective pump with that of the replacement pump).
8.4.5.2 Replacing the pump
1. Document the connections of the defective pump in the switch cabinet
using photos or written notes and compare the wiring diagram of the
defective pump with that of the replacement pump.
2. Make sure that the system or the affected system part is switched off
and cannot be switched back on unintentionally.
3. Make sure that all the lines to be disconnected, including the operational
safety component lines, have zero voltage.
4. Electrically isolate the connections of the defective pumps in the control
cabinet.
WARNING
Missing or insufficient earthing.
Risk of electric shock!
• Make sure that the pump is connected to the protective earth (PE).
5. Connect the replacement pump in accordance with the drawings or the
wiring diagram in the control cabinet.
8.4.5.3 Checking the rotational direction
WARNING
Turning impeller.
Risk of severe injury!
• Never touch the suction or pressure flange.
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