Commissioning And Startup; Startup - EBARA MMD Series Instruction Manual

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CHAPTER 5
COMMISSIONING AND START-UP
5.1 Start-up
Before starting the pump it is necessary to prime it, i.e. to fill
with liquid pump and suction pipe through the suited filing
hole.
In case of double-impeller pumps, bleed trapped air by means of
the suited bleeding valve (see picture).
Check rotation direction against the arrow on pump/motor
casing (see picture); if motor rotation does not match the one
show by the arrow, reverse motor phases (in case of a
three-phases motors).
Once the pump has been primed, close delivery gate valve,
start the pump and open slowly delivery gate valve (startup
with gate valve closed reduces starting voltage peak).
ATTENTION
Never leave delivery gate valve closed for more
Than a minute as the pump can dangerously overheat. Avoid
dry running.
During operation, check shaft seal: it is a mechanical seal,
and therefore there should be no leaks.
Check also that the pump runs within its operating limits and
that voltage values reported on control panel do not exceed
motor nameplate rated values. If necessary, partially close
gate valve or adjust pressure switches intervention.
A slight dripping from the mechanical seal is quite normal
and should not be of concern.
However, if some misfunctioning is detected during startup,
stop immediately the pump and investigate the problem
starting with the Fault Finding chart (chapter 7).
ATTENTION
The system should be fully completed before
starting the pump, especially for what concerns electrical,
mechanical and hydraulic component. All safety system
must be correctly operating.
Junction box cover must always be fixed on motor.
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