Maintaining The Pump; Maintaining The Motor; Motor Inspection - Grundfos CR Installation And Operating Instructions Manual

13. Maintaining the pump

DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
WARNING
Falling objects
Death or serious personal injury
- Follow the lifting instructions.
- Use lifting equipment which is approved for the
weight of the product.
- Persons must keep a safe distance to the product
during lifting operations.
- Wear personal protective equipment.
For lifting instructions, see section
Depending on the conditions and operating time, make the
following checks at regular intervals:
• Check that the pump meets the required performance and is
operating smoothly and quietly.
• Check that there are no leaks, particularly at the shaft seal.
• Check that the motor is not overheating.
• Remove and clean all strainers or filters in the system.
• Check that the tripping function of the motor overload
protection works.
• Check the operation of all controls.
• If the pump is not operated for unusually long periods,
maintain the pump in accordance with these instructions. In
addition, if the pump is not drained, the pump shaft should be
manually rotated or run for short periods of time at monthly
intervals.
• In severe-duty applications, pump life may be extended by
performing one of the following actions:
– Drain the pump after each use.
– Flush the pump with water or other liquid that is compatible
with the pump materials and process liquid.
– Disassemble the pump and thoroughly rinse or wash
components in contact with the pumped liquid with water or
other liquid that is compatible with the pump materials and
process liquid.
If the pump fails to operate or there is a loss of performance, see
section 19. Diagnosing specific
4.3 Lifting instructions.
problems.

14. Maintaining the motor

DANGER
Electric shock
Death or serious personal injury
- Before starting any work on the product, make
sure that the power supply has been switched off
and that it cannot be accidentally switched on.
WARNING
Falling objects
Death or serious personal injury
- Follow the lifting instructions.
- Use lifting equipment which is approved for the
weight of the product.
- Persons must keep a safe distance to the product
during lifting operations.
- Wear personal protective equipment.
For lifting instructions, see section
Only qualified personnel should attempt installation, operation,
and maintenance of this equipment.

14.1 Motor inspection

Inspect the motor approximately every 500 hours of operation or
every three months, whichever occurs first. Keep the motor clean
and the ventilation openings clear.
Go through the following steps during each inspection:
1. Check that the motor is clean. Check that the interior and
exterior of the motor are free of dirt, oil, grease, water, etc.
Oily residue, paper, pulp, textile lint, etc. can accumulate and
block motor ventilation. If the motor is not properly ventilated,
overheating can occur and cause early motor failure.
2. Use an ohmmeter periodically to ensure that the winding
insulation is OK. Record the ohmmeter readings, and
immediately investigate any significant drop in insulation
resistance.
3. Check all electrical connections to be sure that they are
tightened securely.
4.3 Lifting instructions.
23