Fault clean oil outlet: what to do?

Cause: No pressure build-up or pressure drop at the clean oil outlet. What to do: Check separator per its manual; acknowledge and restart

Fault feed temperature: what to do?

Cause: Feed outside min/max temperature. What to do: Correct heater/feed temperature

SHORT-CIRCUIT TERMINAL 19/39: what to do?

Cause: Faulty displacement/filling water valve or wiring. What to do: Check connection, replace valve, press Enter

Display lit but no text: what to do?

Cause: EPROM fitted wrong way round or not programmed. What to do: Check EPROM number TVWS7X4A0-255

ERROR WATCHDOG: what to do?

Cause: Control program reset after abnormal operation. What to do: Acknowledge; if it persists after power cycle replace the unit

Westfalia VESC-1

Separator control unit

The Westfalia VESC-1 control unit runs the separation, sludge discharge (partial and total ejection) and displacement programs of a self-cleaning separator and monitors it. Inputs include motor fault, clean-oil outlet pressure switch, feed temperature min/max switches, feed pump control and sludge tank level switches; outputs drive the feed, displacement/filling water and operating water valves, the sludge pump, a collective alarm and a klaxon. The manual and parts list explains the inputs and outputs, programming of times, operation (start, separation stop, separator off), monitoring and alarms, short-circuit and internal fault finding, and the watchdog.

Click a part on the model to see its number and purpose.Open the 3D manual

Maintenance procedures

Stopping separation

Press key 0 in separation mode: the unit runs waiting, displacement, waiting after displacement and speed recovery, then ejects with minimum product loss. p. 37
Pressing 0 during ejection interrupts the program at once. p. 37
If the motor starter is switched off with the feed valve open, a total ejection is made automatically. p. 37

Clearing an alarm

Read the fault text on the display (e.g. clean oil outlet, feed temperature). p. 37
Eliminate the cause, press Enter to acknowledge, then press I to restart separation. p. 37

Faults and what to do

Fault clean oil outletNo pressure build-up or pressure drop at the clean oil outlet Fault feed temperatureFeed outside min/max temperature SHORT-CIRCUIT TERMINAL 19/39Faulty displacement/filling water valve or wiring Display lit but no textEPROM fitted wrong way round or not programmed ERROR WATCHDOGControl program reset after abnormal operation

Technical specifications

Clean oil outlet pressure alarm delay	about 15 s, then feed valve closes	p. 37
Feed temperature alarm delay	about 15 s	p. 37
Feed pump post-running	20 minutes after stop signal	p. 16
Sludge tank level switch delay	5 s	p. 16
Collective alarm contact	closed = normal, open = fault	p. 18

Source: manufacturer's manual “EM-21-3 WESTFALIA CONTROL UNIT MODEL VESC-1”, 80 pages. Page numbers refer to the original. Check against the manual on board before work.