Xylem IM254R01 e-HM Series - Manual (Page 7)

5.3 Start the pump
1. Start the motor.
2. Gradually open the on-off valve on the discharge side of the
pump.
At the expected operating conditions, the pump must run
smoothly and quietly. If not, refer to Troubleshooting (page 6).
3. If the pump does not start in correctly in 30 seconds, then do the
following:
a)
Switch off the pump.
b) Reprime the pump.
c) Start the pump again.
4. Switch off and on the pump (for about 30 seconds of continuos
running) and make sure that all the trapped air is bled out by re-
peating this 2–3 times.
NOTICE:
Make sure that the pump has bled away all the trapped air. Failure to
do so can harm the product.
6 Maintenance
Precautions
Electrical Hazard:
Disconnect and lock out electrical power before installing or
servicing the unit.
WARNING:
• Maintenance and service must be performed by skilled
and qualified personnel only.
• Observe accident prevention regulations in force.
• Use suitable equipment and protection.
6.1 Service
The pump does not require any scheduled routine maintenance. If the
user wishes to schedule regular maintenance deadlines, they are de-
pendent on the type of pumped liquid and on the operating conditions
of the pump.
Contact the local sales and service representative for any requests or
information regarding routine maintenance or service.
7 Troubleshooting
Introduction
Always specify the exact pump type and identification code when re-
questing information or spare parts from the Sales and Service depart-
ment.
For other situation not mentioned in the table, refer to the Sales and
Service department.
7.1 Troubleshooting table
Problem Cause and solution
The pump does
not start.
• The thermo-overload protection in the single-
phase motor has tripped; it will automatically
reset when the motor cools down.
• Check the power supply wiring to see that the
connections are all tight
• Check to see that the circuit breaker or ground-
fault protection device has tripped. Or replace
any fuses that may have blown.
• Check to see if any protection device installed
for dry running protection has tripped or hung
up.
Problem Cause and solution
The pump starts
up but the ther-
mal protector is
triggered after a
short time or the
fuses blow.
• The power supply cable is damaged, the motor
short circuits or thermal protector or fuses are
not suited for the motor current. Check and re-
place the components as necessary.
• The thermo-overload protection (single phase)
or of the protection device (three-phase) trips
due to excessive current input. Check the
pump working conditions.
• A phase in the power supply is missing. Check
the power supply.
• The pump is clogged with solids and the impel-
ler becomes bound. Clean the pump.
The pump starts
but does not de-
liver any liquid.
• Air is entering the suction piping, check the liq-
uid level, the tightness of the suction pipes and
the operation of the foot valve.
• The pump is not correctly primed. Repeat the
instructions in Prime the pump (page 5).
The pump’s de-
livery is re-
duced.
• Check for restrictions in the piping system.
• Wrong rotation of the impeller (three-phase).
Check the direction of rotation.
• The pump is not correctly primed. Repeat the
instructions in Prime the pump (page 5).
6 Maintenance
6 Model e-HM Installation, Operation, and Maintenance Manual