Grundfos APG Series, Installation And Operating Instructions Manual

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5.1 Motor protection
All single-phase Grundfos APG pumps supplied
without control box must be connected to a separate
control box with motor starter and operating capaci-
tor. The APG pumps must, besides the motor starter,
be connected to both a starting capacitor and an
operating capacitor.
For capacitor sizes, see the tables below:
50 Hz:
60 Hz:
All three-phase Grundfos APG pumps supplied with-
out control box must be connected to a separate
motor starter. The APG 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 cor-
rect 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 start-
ing 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 dis-
mantling.
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.
For long and trouble-free operation of the pump the
following points should be checked regularly:
• Power consumption
• Oil level and oil condition
The oil becomes greyish white like milk if it con-
tains water. This may be the result of a defective
shaft seal. The oil should be replaced after 3000
hours of operation.
Use Shell Ondina 15 oil or similar type.
Note: Used oil must be disposed of in accordance
with local regulations.
The following table states how much oil the APG
pumps must have in the oil chamber:
Pump type
Starting
capacitor
Operating
capacitor
[
μ
F] [V] [
μ
F] [V]
APG.50.11.1(Ex) 60 1 x 230 30 1 x 450
APG.50.18.1 100 1 x 230 50 1 x 450
Pump type
Starting
capacitor
Operating
capacitor
[
μ
F] [V] [
μ
F] [V]
APG.50.12.1 50 1 x 230 25 1 x 450
APG.50.18.1 80 1 x 230 40 1 x 450
APG.50.30.1 150 1 x 230 60 1 x 450
APG.50.33.1 150 1 x 230 60 1 x 450
TM
00
16
18
06
93
The separate control box/motor starter
must not be installed in explosive environ-
ments.
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 acciden-
tally 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.