Pulsafeeder ELMA NEMA 4X, Installation, Operation & Maintenance Manual

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5.8 Connection Diagram
Since the hydraulic oil system is primed at the factory, priming the process system is
all that should be necessary to produce flow. If the hydraulic system has
inadvertently been dumped due to start up with restricted suction or discharge
conditions or improper adjustments to compensator or bleed valves, repriming
procedures under the maintenance section may have to be followed before pump
calibration can begin.
5.9 Trouble Shooting
Problem Probable Cause
Actuator does not adjust
1. No AC power to actuator
2. Pump not running
3. Override switch no in Auto position
4. Control signal off, incorrect, or of inverted polarity
5. Ratio control (if so equipped) set at or very near
zero percent
6. Blown fuse
7. Wiring discontinuity
8. Defective feedback potentiometer (see repairs)
9. Circuit board malfunction
10. Broken drive belt
Actuator adjusts to incorrect settings
1. Control signal incorrect or of inverted polarity
2. Incorrect ratio control setting (if so equipped)
3. Circuit board out of calibration (see “Calibration”)
4. Meter readout out of calibration (if so equipped)
(See “Calibration)
5. Actuator misaligned to pump (See “Repairs”
6. Defective feedback potentiometer (See “Repairs”)
7. Circuit board malfunction
Actuator adjust in one direction only
1. Control signal incorrect or of inverted polarity
2. Incorrect ratio control setting (if so equipped)
3. Wiring discontinuity
4. Defective feedback potentiometer (See “Repairs”)
5. Circuit board malfunction
Erratic operation
1. Wiring discontinuity
2. Narrow deadband (See “Calibration”)
3. Erratic control signal (See “Deadband”)
4. Noisy control signal (check grounding and
shielding of control signal leads)
5. Defective feedback potentiometer (See “Repairs”)
6. Circuit board malfunction