Allweiler Emtec Series - Operating Faults and Solutions; Faults with Reference Numbers; Causes and Remedial Actions

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VM 623.0004 GB/07.00 – Ident–Nr. 550 298
8 Operating Faults, Causes and Remedial Action
8.1 Faults with reference number for cause and remedial action
The table below is intended as a guide to identifying faults and their possible causes. Faults relating to the pressure–relief
valve are listed separately.
If faults occur which are not listed here, or which cannot be traced back to the listed causes, we recommend consulting the
factory, or one of our branch offices or sales offices.
The pump must be depressurized and drained when faults are being rectified.
Screw pump faults
Reference numbers for cause and remedial action
No pump suction and no delivery 1, 2, 3, 4, 5, 11
Delivery too low 2, 6, 7, 8, 9, 10, 11
Pump operates noisily 4, 5, 6, 7, 8, 10, 11, 12, 13
Irregular delivery 6, 7, 10
Pump gets too warm 6, 7, 11, 14, 16
Pump is seized 14, 15, 16
Motor overload 6, 13, 14, 15, 16
Pressure–relief valve faults Reference numbers for cause and remedial action
Delivery pressure drops 17
Pressure–relief valve does not open 18
Pressure–relief valve does not close 19
Pressure–relief valve knocks 20
8.2 Causes and remedial action
Ref. no.:
Cause Remedial action
1 Pump not filled with fluid before initial operation. Fill pump with fluid.
2 Stop valves/sliders not open or only partially
open.
Fully open stop valves/sliders during operation.
3 Motor direction of rotation wrong. The direction of rotation of the motor must match the direction
of rotation arrow on the pump. The direction of rotation can be
reversed by swapping any two phases.
4 Suction pipeline or shaft seal leaky. Retighten flange screw connections. Check shaft seal.
5 Air in suction and pressure system. Open vent valve on pump pressure side until air has escaped.
Close valve again.
6 Wrong fluid viscosity. Check that viscosity matches entries in acceptance test report.
In case of zero–pressure delivery of low–viscosity fluids, apply
1 to 2 bar to pump.
7 Pressure–relief valve leaking. Check pressure–relief valve for passage. If necessary, regrind
valve seat and/or exchange valve cone.
8 Geodetic suction head too high. Check underpressure on suction side using connected
pressure/vacuum gauge. Increase fluid level in tank, lower
pump.
9 Motor speed too low. Check speed and current consumption of motor. Check voltage
and frequency against motor rating plate.
10 Air separating time in operating tank too short. Provide better air separation in operating tank. Return lines
must emerge below oil level of tank.
11 Fluid level in tank too low. Fill tank to necessary fluid level.