User's Manual

Diagnostic Procedures
3A0006D 41
Diagnostic Procedures
The ACS module contains two diagnostic LEDs:
• POWER ON: Solid green when the ACS is powered
and the pump is running.
• DRIVE ENABLED: ON (solid red) if the pump is
stopped and the drive enabled relay is open. OFF if
the pump is running and the drive enabled relay is
closed.
Table 7: Faults and Diagnostic Procedures
Fault Description Diagnostic
High Pressure (System
pressure is higher than the
entered high pressure trip
point.)
1. Check High Pressure Alarm setting. Verify that system desired operational pres-
sure is lower then High Pressure Alarm setting.
2. Check for flow restrictions (closed valves, unexpected restrictions).
3. Check pump fluid section for proper operation (piston seals, ball checks). Refer
to pump maintenance manual for additional information.
Low Pressure (System
pressure is lower than the
entered low pressure trip
point. This alarm is dis-
abled for 1 minute after the
pump starts to prevent pre-
mature alarms.)
1. Check Low Pressure Alarm setting. Verify that system desired operational pres-
sure is higher then Low Pressure Alarm setting.
2. Check fluid level. Low fluid level will cause system to run at low pressure.
3. Check fluid supply to the pump.
4. Check pump fluid section for proper operation (piston seals, ball checks). Refer
to pump maintenance manual for additional information.
Xducer Fail Loss of pressure transducer analog signal, cause by:
• wiring problem
• pressure transducer failure
• circuit board failure
• EMF noise on the control cable
Max Flow (The requested
flow rate is beyond the
pump’s capability.)
Reduce the requested flow rate. (A 20 mA analog drive signal is the maximum.)
NOTE: This trip is a Warning and will not shut off the pump.
Min Flow (The flow rate is
too low for the Run Set-
point.)
Decrease the back pressure regulator pressure or increase the Pressure Setpoint.
NOTE: This warning only occurs in pressure mode.
Auto Cam Off (TDC/Posi-
tion)
Cam mode is not functional due to loss of TDC or position sensor signal (required
for CAM operation). Verify wiring is shielded and installed correctly. See Schematic
Diagrams, page 8.
Start Event ACS has received a start command.
Stop Event ACS has received a stop command.