Commissioning; Assumptions; Checks Before Putting The Motor Into Operation; Switching The Motor On - Andritz SM Serie Instructions De Service

Series SM
L1
L2
L3
PE
U1V1W1
M
3~
5.3.5 Thermal monitoring
• With thermal monitoring with PT100 temperature sensors,
use a suitable triggering unit.
• For motors for frequency converter operation, shielded con-
trol cables must be used. In this case the shield must be con-
nected to earth at both ends of the cable.
• To avoid measurement errors due to cables which are too
long, equalising lines must be used when the cable length is
greater than 50 metres. Use a suitable triggering unit with 3-
line compensation. Connection diagrams for PT100 equalis-
ing lines are provided in the appendix to these instructions.

6. Commissioning

6.1

Assumptions

This chapter assumes that
• the motor has been assembled properly with the pump , as
described in chapter 4.
• the insulation resistance has been measured and assessed
as proper, as described in Chapter 4.
• the completely installed assembly has been mounted prop-
erly at the place of use, as described in the instructions of
the pump manufacturer.
• the motor has been connected properly and fused, as de-
scribed in chapter 5.
6.2

Checks before putting the motor into operation

Before putting the motor into operation, first make sure that
• the motor is fully submerged. The motor may only be oper-
ated underwater.
• the standpipe is vented, in order to avoid water hammer dur-
ing start-up. Otherwise both the assembly and the supply
lines can be damaged.
• the pump manufacturer's conditions for start-up must be ful-
filled.
• all electrical connections and safeguards must be checked
and fuses must be set properly.
• access to all danger areas must be prevented, in particular
to rotating parts, intake points or pressure outlets and electri-
cal connections.
20
U2V2W2
Figure 6: Star-delta starting
• the medium temperature for water-filled motors must not
drop below 0 °C.
Otherwise you must not put the motor into operation, because
there is an accident risk and the motor can be damaged.
6.3

Switching the motor on

If you have checked all of the points mentioned above and en-
sured that they have been observed, you can then switch on the
motor.
Immediately after switching it on, measure the following:
• the operating voltage of the motor in each phase.
• the system voltage with the motor running.
• the state of the medium being pumped.
Switch the motor off immediately if
• the nominal current is exceeded according to the rating
plate.
• voltage tolerances of more than +6%/-10% from the nominal
PE
voltage are measured. For weak supply mains, we recom-
mend using a voltage monitor.
• if there is a risk of dry running. If the influx is irregular, a level
switch must be installed to prevent dry running.
• if the deviation of a motor current from the average of all
three currents exceeds 10%.
6.4

In test operation

The motor is subjected to stress each time it is switched
on. In particular, a high frequency of operations shortens the
service life of the motor.
For this reason it is important to ensure that the values for fre-
quency of operations specified in section 2.2 are not exceed-
ed, even in test operation. The associated pauses must also be
observed.
It must be ensured that the switching station does not cause
any flutter switching.

7. Maintenance

• Submersible motors are maintenance-free.
• In order to avoid malfunctions due to sediments, the motor
should be operated in the well for at least 5 minutes per week.
The motor must be completely submerged during this
time.
• In order to detect malfunctions in good time, we recommend
that you carry out and document the following tests:
- Supply voltage
- Power consumption
- Insulation measurement
- Operating hours
- Specifications of the pump manufacturer (delivery rate, out-
let pressure, etc.)
The power consumption is the most important value for mon-
itoring the function of the motor. If the current consumption
deviates significantly from the specified value, then it is nec-
essary to determine the cause. Excessive current con-
sumption will damage the motor!

8. Faults: Causes and remedial action

8.1

General

For your safety!
Pay special attention to the safety instructions pro-
vided here. Otherwise there is a risk of accidents
and death!
• Do not perform any work on the motor other than that de-
scribed here. Otherwise the motor may be damaged and the
operational safety of the system will no longer be ensured.