Operation - EBARA GSD Series Translation Of The Original Instructions

mended in order to prevent any electric shock accidents as well as
to provide specific overcurrent protection for motors with the aim of
avoiding damage related to overheating.
- Make the connections, depending on the case, taking into account
EN
the motor powers:
a) Direct starting (up to 5.5 kW) with three-phase motor (230/400V
and 400/690V) (FIG. A1-A2)
b) Star-delta starting (recommended starting from 5.5 kW) always
with three-phase motor (FIG. B). Possible starting with Inverter,
after checking the suitability of the motor bearings with the Ebara
assistance network (FIG. A1)
L1' L2'
W2 U2
U1 V1
L1 L2
W2 U2
U1 V1
L1 L2
L1' L2'
W2 U2
U1 V1
L1 L2
- Once the pump has been connected and started, looking at it from
the motor side, make sure that the cooling fan rotates in the di-
rection of the arrow indicated on the fan cover. If incorrect, reverse
two of the three wires in the motor terminal strip.
9.5.2 ELECTRICAL MAINTENANCE
ANY OPERATION ON THE MOTOR OR ON ANY
OTHER
MUST BE CARRIED OUT WITH THE EQUIPMENT
SWITCHED OFF AND AFTER CUTTING OFF THE
MAINS POWER SUPPLY.
- Periodically check that the requirements relating to assembly and
electrical connection are met.
- Respect the periodicity of lubrication of the bearings and the type
of grease (in case it is specified on the motor plate). However, it is
advisable to replace the bearings after three years.
10
L3'
V2
FIG. A1
Lower voltage
(Triangle Connection)
W1
L3
V2
FIG. A2
Higher voltage
(Star Connection)
W1
L3
L3'
V2
FIG. B
(Star-Triangle start)
W1
L3
CURRENT-POWERED ACCESSORY

10. OPERATION

10.1 BEFORE STARTING THE PUMP
1. Be sure to have flushed the pipes after completing the assembly.
This prevents impurities from causing faults, noise and abnormal
wear near the mechanical seal and in other parts of the pump.
2. Check that the impeller rotates easily by turning the shaft by hand.
If movement is difficult or very irregular, check the pump as the
mechanical seal may be damaged, or there may be rust inside the
pump.
3. Check the technical operating data of the motor shown on the pla-
te.
4. Do not operate the pump without having previously emptied it of
the product from previous uses. In the case of a suction lift system
with suction pump, the pump and the suction pipes must be filled
beforehand. With a sub-head system, fill the pump with water by
acting on the suction and delivery valves. Check that there is no air
left inside the pump by manually rotating it (see paragraph 9.3).
5. Check the direction of rotation of the motor, as indicated below:
- Close the supply and suction valves.
- Start the motor for 1 or 2 seconds, then stop it.
- Visually check that the direction of rotation is correct using the
motor fan. The direction of rotation is indicated by an arrow po-
sitioned on the pump body. Typically, it is clockwise (to the right)
when the observer is on the fan side of the motor.
10.2 STARTING THE PUMP
DO NOT OPERATE THE PUMP BEFORE IT IS
PLACED AND INSTALLED IN ITS FINAL POSITION
OF USE. THIS OPERATION MUST BE PERFORMED
WITH THE MOTOR TERMINAL STRIP PERFECTLY
SEALED.
1. Close the delivery valve. Open the inlet valve if it is closed.
2. Turn the motion start switch on and off once or twice to make sure
that there are no starting malfunctions.
3. When the rotation speed remains fixed on the nominal speed,
open the delivery valve gradually.
4. Check that there are no considerable variations regarding the
pressure of the pump and the current absorbed by the motor.
Check that there are no significant vibrations and/or abnormal
noises. For subsequent start-ups, proceed in the same way, if the
operating conditions are normal, respecting the instructions provi-
ded in chapter 11. MAINTENANCE
5. In case of mechanical seal there could be an initial slight dripping
which usually stops in the first 3/5 minutes of operation. Subse-
quently a few drops/day is permitted. If the dripping continues or
increases, see chapter 11. MAINTENANCE.
DURING PUMP OPERATION, DO NOT TOUCH
THE MOTOR, THE PUMP ITSELF OR THE
PUMPED FLUID. DANGER OF BURNS. POSSI-
BLE TEMPERATURES ABOVE 50 DEGREES.
WAIT FOR COOLING.
10.3 STOPPING THE PUMP
Before stopping the pump, it is advisable to gradually close the de-
livery valve.
If the pump has stopped due to a sudden power failure, disconnect
the motor switch to prevent the pump from starting immediately when
power is restored, thus putting personnel at risk.