Flowserve DRC-17 - Manual (Page 27)

WCAIM2058 DataFlo Digital Electronic Remote Controller DRC17 27
Symptom Table
Symptom Paragraphs to Reference
Actuator will not operate in either direction [no sound from motor(s)] ............................................................... 6.5.1 through 6.5.7, 6.5.10
Actuator will not operate in either direction [humming or buzzing sound from motor(s)] ............ 6.5.2 through 6.5.6, 6.5.9 through 6.5.12
Actuator slowly moves in one direction on its own................................................................................................................................. 6.5.4
Actuator runs normally for 7° to 8° while coming off the limit switch,
then slows down or stops [motor(s) hum or buzz]. ................................................................................................................... 6.5.4, 6.5.15
Actuator oscillates intermittently........................................................................................................................... 6.5.2, 6.5.8, 6.5.13, 6.5.16
Actuator runs slowly in one or both directions, but otherwise operates normally. .................................... 6.5.2, 6.5.4, 6.5.9 through 6.5.12
Actuator works intermittently. ......................................................................................................................................... 6.5.2, 6.5.10, 6.5.12
Actuator runs normally in one direction but will not operate
in the other direction [no hum or buzz from motor(s)]. ..................................................................................................... 6.5.2, 6.5.4, 6.5.7
Actuator will not move valve after a stop when signaled to travel in the same direction. ..................................................................... 6.5.14
Flow Control
Worcester Actuation Systems
6.5 Corrective Action Table
When the section of this table has been determined from the
Symptom Table, this table will provide information to check and
possibly correct the problem.
6.5.1 What to check: Check for proper power connection to DRC
Action to take: Correct as necessary
Notes and cautions: Follow steps in section 3.0.
6.5.2 What to check: With power off, check for broken wires
and/or loose connections.
Action to take: Repair or replace broken wires and tighten
loose connections.
6.5.3 What to check: With power off, check the continuity of
fuse F1 on the Power Supply Board
Action to take: If fuse is open, return the DRC for service.
Notes and cautions: If F1 is open, do not attempt to
restore power to the DRC.
6.5.4 What to check: Check general operation of controller as
described in section 6.0.
Action to take: See section 6.1.
Notes and cautions: This check will isolate the problem to
either the actuator motor(s) or the DRC electronics.
6.5.5 What to check: Check for proper range of setpoint and
process input signals.
Action to take: Use an ammeter, voltmeter, or ohmmeter to
verify a good signal.
Notes and cautions: Check the full range of the signal to
ensure it is correct.
6.5.6 What to check: Check the calibration of the feedback
potentiometer.
Action to take: With the shaft in the full CW position,
adjust pot position for a reading between .200 and .400
volts and recalibrate if necessary per paragraph 4.9.2.
Notes and cautions: When trying to move the valve
manually with the clutch disengaged, be certain that the
wrench fits properly on the flats of the actuator shaft.
Improper fit can cause shaft damage with consequent
damage to cover bearing surface. Stay within the
specified quadrant of operation. See paragraph 1.1.3.
6.5.7 What to check: Check to see that varying the process
signal above and below the setpoint value causes the
LEDs on the motor driver board to turn on and off
individually.
Action to take: If LEDs do turn on and off, replace the
motor driver board. If the LEDs do not light with a new
board installed, return the DRC for service.
Notes and cautions: When the LEDs turn on and off it
indicates the setpoint and process inputs are correctly
working.
6.5.8 What to check: Check the operation of the DRC with a
process signal simulator.
Action to take: If intermittent or jittery operation stops, it
is indicative of a noisy online signal input. The signal
should be “cleaned up.” Check for proper shielding as
described in paragraph 1.1.1.
Notes and cautions: The process signal can be simulated
as described in part 6.1. Increasing the deadband may
help to alleviate the problem.