18
Valve Control Module
User’s Manual
Troubleshooting
Problem
Cause
Remedy
Module (MOD) LED
Off
No power applied to the device.
Connect power.
Green
Normal operation.
No action needed.
Flashing Green
Device needs to be configured
Configure device.
Red
Device has an unrecoverable fault.
Cycle power to device. If device fails to recover,
contact your authorized Swagelok representative.
Flashing Red
Device has invalid configuration.
Check configuration setup.
Network (NET) LED
Off
The device has no power or the channel
is disabled for communication due to
bus off condition, loss of network power,
or has been intentionally disabled.
Power-up the scanner, provide network power
to channel, and make sure channel is enabled in
both the scanner configuration table and module
command word.
Green
Normal operation.
No action needed.
Flashing Green
The channel is enabled but no
communication is occurring.
The two-digit numeric display for the
channel indicates an error code that
provides more information about the
condition of the channel.
Configure scan list table for channel to add
device.
Red
The communication channel has failed.
The two-digit numeric display for the
channel indicates an error code that
provides more information about the
condition of the channel.
This may indicate a defective scanner.
Reset scanner. If failures continue,
replace scanner.
Flashing Red
At least one of the devices in the
scanner’s scan list table has failed to
communicate with the scanner. The
network has faulted.
The two-digit numeric display for the
channel indicates an error code that
provides more information about the
condition of the channel.
Examine the failed device and examine the
scan list table for accuracy.
General
System valves do
not actuate.
VCM inlet pressure is too low.
The system valve actuation pressure may be
different from the VCM operating pressure.
Ensure the inlet pressure is suitable for the
system valve.
System valves
do not return to
normal state
VCM exhaust may be blocked.
Ensure that the VCM exhaust is able to properly
vent.
Valve indicator
LED is on when
valve is closed
The valve has been configured to read
the feedback from the proximity sensor.
The valve indicator LED will reflect the value of
the sensor not the position of the valve.
System valve
is on when the
proximity sensor
is off.
The valve and sensor have different
“polarities.”
This is normal system operation.
System valves
actuate when the
pilot valve is off.
The inlet pressure is too high.
Lower the inlet pressure going to the VCM.
Notice: Applying inlet pressure above the VCM
product rating can permanently damage the pilot
valves.