Hitachi YUTAKI Series - Troubleshooting of Accessories; Pump Kit

227
Troubleshooting of accessories
SMGB0066 rev.0 - 12/2009
Troubleshooting
Service Manual
7

 
  

There is air in the unit. Vent the unit.
The pump volume rate is too strong. Decrease the pump output by switching to a lower speed.
The pump lift is too high. Decrease the pump output by switching to a lower speed.

Cavitationnoisehasoccuredinthepumpduetoinsufcient
inlet pressure.
Check the pressure level/system admission pressure and
increase to the admissible range.
There is a foreign body inside the pump housing or impeller. Disassemble the pump head and remove the foreign body.
There is air in the pump. Vent the pump/unit.
Shut-off valves are not fully open. Open the shut-off valves fully.

There is a foreign body inside the pump housing or impeller. Disassemble the pump head and remove the foreign body.
Wrong pumping direction.
Exchange the pump pressure and suction sides. Observe
the arrow indicating direction on the pump housing.
Shut-off valves are not fully open. Open the shut-off valves fully.
Wrong direction of rotation. Correct the electrical connection in the terminal box:


Elektrical fuse faulty/has switched off.
Change fuse/switch on electrical connection.
Should the fuse blow several times in a row:
- Check the pump for electrical faults.
- Check the pump mains cable and electrical connection.
Residual current operated circuit-breaker has tiggered.
Switch residual current operated circuit-breakes back on.
Should the circuit-breaker trip several times in arow:
- Check the pump for electrical faults.
- Check the pump mains cable and electrical connection.
Undervoltage Check the voltage at the pump (observe rating plate data).
Winding damage Call customer Services.
Faulty terminal box Call customer Services.
Faulty capacitor Replace the capacitor.
 

Motor protection has switched the pump off as a result of:
 Hydraulic overloading  A blockage  An excessive pump
medium temperature.
 An excessive ambient
temperature.

 Reduce the pump on
the pressure side to an
operationg point which is on
the characteristic line.
 Fully remove the pump
ventscrew,checkandrectify
free runnig of pump rotor by
turning the slotted end of the
shaft with a screwdriver.

Disassemble the motor
head and check; unblock by
turning the impeller where
necessary. If the blockage
cannotberemoved,contact
Customer Services.
 Decrease the pump
medium temperature in
accordance with the rating
plate.
 Decrease the ambient
temperature,e.g.by
insulating the pipes and
ttings.