80 | Baker Hughes
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Condition
Response
Action
If Digital Input Activated
Displays
CTRL: Idle
.
If the Open and Close signal are present at the same time
the display shows
CTRL: Fault
. Disconnect the wires to
the TB2 # 7 open command, and 8 close commands, if this
clears the display to Idle, check the
switches, DI on SCADA
should be open
.
Limit alarm ON minimum or
maximum
If the valve is not fully Close or Open, check the settings at
Logging and Alarms/ Limit Alarms =Adjust the alarm Upper
Limit 55% to 100% and the Lower
Limit 0% to 45%
.
Controller displays a flashing
alarm screen,
Error Light ON normal oper-
ation continues even though
this screen is being displayed.
Indicates that the valve is not responding to signal
.
Check Valve Position, which must be same position as the
DNGP Input Config Menu/ Position Action =
Close on Increase or Open on increase
.
If the valve is going to be on the close position most of the
time, close the valve and check the
CTRL:
and
FDBK :
values, which must be within .16 mA. if not, adjust
the VP pot or magnet for the linear position transmitter.
DNGP doesn’t move on
change of signal CTRL and
FDBK shows some mA
signal
.
Minimum pressure for solenoid operation in 60 psi
.
Check the air pressure block valve, the
Standby/Manual Switch should be on Auto, the
MCV3L should be on Auto, and the solenoid manual on
Auto, if available
.
Cycling of DNGP
Perform a leak test on unit; check the Deadband on the
display and move up if necessary
.
3A fuse protects the board not
the solenoids
For 24 VDC the impedance should be 58-65 Ohms; for
12VDC 14-17 Ohms
.
Increased or sudden cycling
of positioner
Perform leak test on unit (See below)
.
3A fuse on logic board blown
Perform measurement of voltage power supply 12-24 VDC.
Maximum allowed voltage is 30 VDC. If supply voltage
exceeds 24 V the fuse will protect the board, not the
solenoids.
Measure the resistance of solenoid coils.
• For 24 VDC: If below 58-65 Ohms, the solenoid is
shorted.
• For 12 VDC: If below 14-17 Ohms, the solenoid is
shorted. Change the solenoid coils. See spare parts list
for coil part number
