Xylem GOULDS e-SVI Series, Instruction Manual

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Cause Remedy
The presence of air in the unit 1. Bleed the unit.
2. Check the suction conditions.
3. Increase the liquid level inside the tank.
4. Remove the foam.
5. Remove any turbulences in the suction area.
The check valve is blocked or partially clogged. Replace the check valve.
The pipes, on-off valves, or filter clogged with
impurities
Remove the impurities.
There are leaks in the following components:
• Gaskets
• Unit
• Bypass pipe
1. Replace the gaskets.
2. Check the flow rate of the bypass pipe.
3. If the problem continues, contact the local sales and
service representative.
The unwanted materials in the unit Remove the unwanted materials.
If available, the frequency converter is not
correctly calibrated
For more information, see the frequency converter
manual.
The unit is undersized. Contact the local sales and service representative.
The wear of the unit components Contact the local sales and service representative.
The unit is defective. Contact the local sales and service representative.
7.8 The unit turns in the opposite direction
When the power switched off, the unit turns in the opposite direction.
Cause Remedy
The check valve is defective. Replace the check valve.
7.9 The unit starts and stops
The unit with automatic start and stop device starts and stops too frequently.
Cause Remedy
The check valve that is locked in closed or partially
closed position.
Replace the check valve.
The piping is chocked or obstructed. Remove all the chocking or obstructions.
The starter is set incorrectly or defective. 1. Adjust the starter.
2. If the problem continues, replace the starter.
Protection device against lack of liquid set
incorrectly or defective
1. Adjust the device.
2. If the problem continues, replace the device.
7.10 The unit does not stop
The unit with the automatic start and stop device never stops.
Cause Remedy
The required flow rate is greater than the one
expected.
Decrease the required flow rate.
The three-phase motor turns in the incorrect
direction.
1. Check the direction of rotation.
2. If necessary, change three-phase motor.
The pipes, on-off valves, or filter is clogged
with impurities
Remove the impurities.
The starter is set incorrectly or starter is
defective.
Adjust or replace the starter.
7 Troubleshooting
32 e-SVI series Instruction Manual