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7.2 Electrical installation
The electrical installation should be carried out by an authorized
person in accordance with local regulations and the relevant
wiring diagram.
•
The electrical installation of the booster set must comply with
enclosure class, IP 54.
•
Make sure that the booster set is suitable for the electricity
supply to which it is connected.
•
Make sure that the wire cross-section corresponds to the
specifications in the wiring diagram.
The connection of the electrical supply, transmitters and external
monitoring equipment must be carried out by an authorized
electrician in accordance with the NEC, local regulations and the
BoosterpaQ wiring diagram.
Ensure that the Hydro MPC controls and the pumps are suitable
for the electricity supply on which they will be used (see Technical
Data). Please read the wiring diagram carefully. According to the
NEC, if the motors cannot be seen from the control panel, they
must be fitted with a disconnected switch.
Any BoosterpaQ that utilizes a variable frequency drive (E, ED,
ES, EF, EDF, F) should be connected to an electrical supply that
all phase lines are electrically symmetrical with respect to ground.
A "four wire wye" electrical supply with line impedance between
0.5% - 3% is recommended. If a variable frequency drive is
connected to a delta transformer or if line impedance is not within
the recommended 0.5% - 3%, the drive may not operate correctly
and may not provide optimum performance (excessive faults,
erratic behavior, or complete failure). Ask your power company or
electrician to determine what type of electrical supply is present.
Generator supplied power must meet public utility power quality
standards.
8. Start-up
1. Have a qualified person check for proper power supply and
plumbing connections. Make sure the main power is off.
2. Check that the air pre-charge in the diaphragm tank is 0.7
times the required discharge pressure set-point (0.9 times for
MPC-S systems). System pressure must not be applied to the
tank connection during the tank precharge process. If water is
supplied to the tank from the system, close the tank valve
during the pressurizing process.
Prime the system as follows
3.
Suction pressure system
(pumps are flooded at least as high
as the highest part of the pumps)
– close all discharge manifold pump isolation valves and open
all inlet manifold pump isolation valves
– open the vent plug on top of each pump. It is a small hex
head screw in a large vent plug. Air and water will escape
from the pump through a small hole in the large vent plug.
When the air is out and water is flowing steadily, tighten the
small hex head screw on the vent plug to stop the flow.
4.
Suction lift system
(the water source is below the pumps or
does not flood the pumps to the highest point on the pumps).
– close all discharge manifold pump isolation valves and open
all inlet manifold pump isolation valves
– for suction lift applications, a foot valve must be placed on
the inlet piping at the water source (tank, etc). If there is a fill
point above the highest point of the pumps, you may fill the
system from this point. If there is no fill point above the
highest point of the pumps, remove the large vent plug on
each pump. Fill each pump until the water is up to the vent
plug, then replace the vent plugs.
5. Ensure all circuit breakers are in the "on" position.
6. Make sure the discharge manifold pump isolatin valves are
closed. Switch on main power.
7. At this time "Start-up wizard" may now be ran. Steps 8 and 10
can be skipped upon completion of "Start-up wizard". If "Start-
up wizard" could not be ran or already ran proceed to step 8.
8. Turn the MPC controller to Max. by performing the following:
Move top line display to "Operation", next move down to
"System operating mode" and press OK. Next use the Up or
Down button and select the "Max". setting and press OK.
9. Vent the system by opening the vent plug on each pump (as in
Step 3). Venting with the pumps running ensures all air is
removed from the suction piping. Do not run the system with
the discharge manifold pump isolation valves closed more
than five minutes to prevent over-heating of the pump liquid.
10.Turn the MPC controller to Stop by performing Step 8. again
and select "Stop" instead of "Max". As pumps stop, check
pump rotation. Repeat as necessary. If the area is dark, a
flashlight may be required, or remove a coupling guard on
each pump for better visibility. Disconnect the main power
when removing coupling guards.
If the rotation is incorrect on any 3 phase pumps, switch any 2
of the 3 power main wires supplied to the control panel (L1,
L2, L3). If that doesn’t correct the rotation, call your Grundfos
representative.
11.Upon completion of venting pumps and checking for correct
rotation you are now ready to bring BoosterpaQ online. With
the discharge manifold isolation valves still closed, turn the
MPC controller to "Max". (See Step 8 above). Partially open
each pump discharge isolation valve to allow water to enter
into discharge piping of BoosterpaQ. Continue the process of
filling the discharge piping until discharge piping pressure is
approximately desired Setpoint pressure of BoosterpaQ.
12.Turn MPC controller to "Normal" by performing Step 8 again
and select "Normal" instead of "Max". Open the discharge
manifold isolation valves for each pump completely. System is
now on line.
13.It may be necessary to clear alarms in fault log. Follow steps
in paragraph sections
Note
The pump mains connection must be carried out
as shown in the wiring diagram.
Note
If you are filling an empty piping system, do not
allow the pumps to run with the discharge valves
wide open as cavitation may occur.
Caution
The pumps may start at this time.
Warning
Do not touch the couplings while the pumps are
turning as injury may result. Replace all coupling
guards after the rotation check. Disconnect main
power when removing and replacing coupling
guards (or open service disconnect switches if
this option was supplied).
Note
If you are filling an empty piping system, do not
allow the pumps to run with the discharge valves
wide open as cavitation may occur.
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