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58
BOOSTER PUMP SYSTEM
BOOSTER PUMP SYSTEM N747D
4) Remove all air by opening air cocks of inlet and pump, until
water is dispensed only.
5) Close air cocks.
6) Turn on all internal NFB (breaker) of panel.
7) Turn on the power switch of the panel front.
8) If it is 3 pump system, then set switches of PUMP#1, PUMP#2
and PUMP#3 at AUTO position.
9) Press test operation Key on the controller ( the rotation
direction of the motor fan is counterclockwise). Press Key
once then direct-input operation starts, press twice then stops.
Again press Key once then inverter starts, press twice
then stops. If the motor rotation direction is wrong, re-connect
of the direct-input starting in RST or RTS order. In case of
inverter starting, change the inverter output terminal from UVW
to UWV.
10) Once rotation direction is confirmed, then verify if the set
pressure of controller LCD screen is the desired input value ( in
case of change set pressure, correct the date · set pressure
according to this manual printed inside of the panel).
11) When all steps are completed, set “START / STOP” switch at
“START” and start the operation.
1.
Emergency operation
Types of emergent operation
Emergent operation system is required against to any emergency
of water supply pump for its special requirement.
-
In case of inverter failure, automatic emergent operation /
sequential 1 operation / sequential 2 operation
1. Automatic emergent operation in inverter failure
Reason :
In case of inverter failure
Starting method :
If inverter is in failure, RPM of main pump is out of control.
Even in such situation, as water shall be supplied until A/S team
arrives, therefore, automatic emergent operation ( pressure method)
is carried out.
Its operating principle is ; pipe pressure can be detected by pressure
transmitter then normal operation is sustained by program control of
controller in all functions such as shift operation excluding RPM
control.