Start-Up; Pre-Commissioning; Filling / Venting; Running Checks - Wilo MMI50V Instrucciones De Instalación Y Funcionamiento

The harmonic currents that are created by the VSD pass through
motor ball bearings. Standard ball bearings can be used up to 55KW. For
higher installed power (see engraved power on motor name plate), the
motor should be equipped with isolated ball bearings (specific ball
bearing) or with isolated bearing housing (and standard ball bearing).
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START-UP

8.1 PRE-COMMISSIONING

If the pump is installed in a potentially explosive atmosphere or
when dangerous or polluting fluids are pumped, it is advised (Zone 2) or
requested (zone 1) to install additional protection devices.
Check following points :
- Pump flow is always higher than authorized continuous minimum
flow,
- Pump never runs dry,
- Surface temperature bearings housings is lower than the maximum
admissible surface temperature in selected ATEX zone,
- Pressure on discharge side of the pump is lower than pump
maximum allowable working pressure.
- Set alarm and stop trips of sensors.
IN EVERY CASES CHECK :
- Quality of electrical connections,
- Protection devices are installed,
- Auxiliary lubrication piping is connected and running,
- Flanges connections,
- Minimum liquid level,
- Motor direction of rotation is correct,
- Oil level was checked and greasing of ball bearings has been done,
- Coupling guard is installed.

8.2 FILLING / VENTING

The volute casing is always submerged. Manual filling is not necessary.
Due to its design, the pump does not need to be vented.
8.3 START-UP
If a barrier fluid, flushing fluid, cooling fluid or a heating fluid is
used, check that auxiliary systems are activated and working correctly
before pump start-up.
 Close isolating valve on pump discharge side.
 Open all valves in suction line.
 Proceed to pump priming (if not already done). Pump casing and
suction pipe should be completely filled with fluid.
 Turn the pump on and check discharge pressure increase. Compare
this pressure to the shutoff pressure available on the hydraulic curve
In order to avoid an important overheating of the liquid inside the
pump the pump should not work more than 20 to 30 seconds against a
closed discharge valve.
 If expected pressure is reached then progressively open the discharge
valve.
If there is no liquid delivered or if discharge pressure is too low
then see chapter "trouble shooting".

8.4 RUNNING CHECKS

During operation of pump in duty conditions (capacity, head,
temperature, ...) the following points must be checked :
- Check and register the pressure and flowrate at this point. If
necessary convert pression read in Bar on pressure gauge to mwc :
HMT = (P x 100) / (d x 9,806) with d= fluid specif gravity.
mwc bar
- Check and register the current drawn on each motor phase.
- Check that motor protections are correctly calibrated.
- Check surface temperature on motor ball bearings for CS
assemblies and on bearing bracket for TM and TH motor
assemblies.
After several starts check :
- Start and stop fluid levels.
- Tightening of the flanges fastening bolts.
- There is no leakage and no abnormal running noise.
Check that pumps stops on minimum flow is pump is used in an
ATEX atmosphere zone 1. Register surface temperature of bearing
brackets (ball bearings).
Refer to the flow sensor operating manual before starting adjustment.

8.5 SHUTDOWN

Before the pump is stopped close the discharge isolating valve.
Ensure that the pump runs in that condition no more than few
seconds.
When the pump has come to a standstill : close the suction isolating
valve. If the pump is equipped with auxiliary systems such as a quench,
heating system, flushing, external lubrication, etc ... it must be closed at
the last step.
If temperature is likely to drop below freezing point, pump casing
and auxiliary connected systems should be completely drained or
otherwise protected. For prolonged shut-downs an adapted rust
protective coating should be applied to the inside and outside of the
pump.
Pumping explosive, toxic or polluting fluids : make sure that all
necessary actions were taken to avoid the creation of a hazard for
people or environment during drainage operations.
Products which are sent back to WILO must be drained and
cleaned. Pumped fluid should be completely removed from the pump.
ENGLISH
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