English (GB)
8
5.1 Motor protection
All single-phase Grundfos AP pumps supplied
without control box must be connected to a separate
control box with motor starter and operating
capacitor. For capacitor sizes, see the tables below:
50 Hz:
60 Hz:
All three-phase Grundfos AP pumps supplied
without control box must be connected to a separate
motor starter. The explosion-proof pumps have a
thermal switch built into the motor windings. The
thermal switch is connected to the control circuit of
the motor starter, see fig. 1.
Fig. 1
6. Start-up
Do not start up the pump until the system has been
filled with liquid and vented. Make sure that the
pump is submerged in the liquid, open the isolating
valves, if fitted, and check the setting of the level
switches.
Note: The pump may, however, be started for a very
short period without being submerged for checking
of the direction of rotation.
6.1 Direction of rotation
All single-phase pumps are factory-set to the
correct direction of rotation.
Before starting up three-phase pumps, check the
direction of rotation. The direction of rotation should
be clockwise when viewed from above. When
starting up, the pump will jerk in the opposite
direction to the direction of rotation. If the direction of
rotation is wrong, interchange two of the three
phases of the electricity supply.
7. Maintenance and service
Before carrying out maintenance and service, make
sure that the pump has been thoroughly flushed with
clean water. Rinse the pump parts in water after
dismantling.
Pumps running normal operation should be
inspected at least once a year. If the pumped liquid is
very muddy or sandy, inspect the pump at shorter
intervals.
When the pump is new or after replacement of the
shaft seals, check the oil level after one week of
operation.
Pump type
Operating capacitor
[µF]
[V]
AP51.65.07.1
25
1 x 450
AP51.65.12.1
30
1 x 450
Pump type
Operating capacitor
[µF]
[V]
AP51.65.09.1
20
1 x 450
AP51.65.13.1
25
1 x 450
AP51.65.14.1V
25
1 x 450
T
M
00
16
18
06
9
3
The separate control box/motor starter
must not be installed in explosive
environments.
M
Max. 250V / 2.5 A
T1
U
V
W
T2
PE
Max. 250 V/2.5 A
Before starting work on the pump,
make sure that the electricity supply
has been switched off and that it
cannot be accidentally switched on.
Furthermore, all rotating parts must
have stopped moving.
When unscrewing the inspection screw
of the oil chamber, please note that
pressure may have built up in the
chamber. Do not remove the screw
until the pressure has been fully
relieved.
