P
t
1
2
3
S3 operation
Position
Description
1
Operation
2
Stop
3
Duty cycle
Direction of rotation
All single-phase pumps are factory-wired for the
correct direction of rotation. Before starting up three-
phase pumps, check the direction of rotation. An
arrow on the stator housing indicates the correct
direction of rotation.
The impeller rotates clockwise. When
started, the pump jerks counterclockwise.
Procedure 1:
1.
Start the pump and measure the quantity of liquid
or the outlet pressure.
2.
Stop the pump and interchange two phases in
the power cable.
3.
Restart the pump and measure the quantity of
liquid or the outlet pressure.
4.
Stop the pump.
5.
Compare the results of steps 1 and 3. The
connection which gives the larger quantity of
liquid or the higher pressure is the correct
direction of rotation.
Procedure 2:
1.
Let the pump hang from a lifting device such as
the chain used for lowering the pump into the pit.
2.
Start and stop the pump while observing the
movement (jerk) of the pump.
3.
If connected correctly, the pump jerks
counterclockwise.
4.
If the direction of rotation is wrong, interchange
two phases in the power cable.
Jerk direction
Storing the product
For periods of storage the pump must be protected
against moisture and heat.
After a period of storage, inspect the pump before
putting it into operation. Make sure that the impeller
can rotate freely. Pay attention to the condition of the
shaft seals, O-rings and the cable entries.
Leave the cable-end protectors on the
power and control cables until starting the
electrical connection. Whether insulated or
not, the free cable end must never be
exposed to moisture or water. Non-
compliance with this may cause damage
to the motor.
If the pump is being stored for more than
one month, turn the impeller at least every
month to prevent the seal faces of the
lower mechanical shaft seal from seizing
up.
If you do not do this, the shaft seal may be
damaged when the pump is started.
If the impeller cannot be turned, contact
Grundfos or an authorised service
workshop.
WARNING
Crushing hazard
Death or serious personal injury
‐
Do not turn the impeller by hand.
Always use an appropriate tool.
WARNING
Crushing hazard
Death or serious personal injury
‐
Do not turn the impeller by hand.
Always use an appropriate tool.
Maintenance schedule
Before initial startup or after a longer period of
storage:
•
Check the insulation resistance.
12
English (GB)
Summary of Contents for AP80-100
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