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8. Maintenance and Troubleshooting
8-1. Action recovery from Power Failure
The state of operation before power failure returns. Nevertheless, EV output with standby action is put in the state of standby.
8-2. Procedure of Maintenance Replacement and
Matters to Be Attended to
Confirmation of Model Code:
Check the model code of the component part in trouble.
Confirmation and Recording of Set Data:
Record parameters and numerical values set before replacing the instrument. (Please use 9. Record of Parameter Setting.)
Replacing and Wiring:
Record the wiring before replacement as the occasion demands and once replaced, wire carefully to avoid erroneous wiring.
Make sure that power supply is turned off before starting wiring.
Setting and Confirmation of Parameters:
Following the replacement, set parameters and input numerical data with reference to, for example, the Record of Parameter
Setting filled in. Please note that without such input, the same control action as before cannot be expected of the new instrument.
Trial Run and Adjustment:
After replacement with a new or repaired instrument, carry out trial run and adjustment following the instructions in 5-1
Procedure of and Notes on Adjustment for Trial Run.
Problem
Cause
Remedy
Error code is displayed.
Refer to "Error Codes, Causes and
Remedies."
Refer to "Error Codes, Causes and Remedies."
Directions of opening action
and closing action are
inversed.
Erroneous wiring to potentiometer of
control motor or for control signals.
Erroneous setting of output characteristic
(DA,
RA).
Correct wiring to potentiometer of control motor
(terminals 4, 5, and 6) or for control signals
(terminals 15, 16 and 17).
Confirmation of setting and correcting output
characteristics (DA, RA)
Hunting (frequent repetition
of turning round)
Input to the instrument is instable.
Dead band (insensitive area) is too small.
Increase the dead band.
Check wiring connection (terminals 2 and 3).
Set input filter.
For the sake of hardware, stabilize input signals.
Control motor does not
operate.
Full open or full close
position is not correct.
Zero/span position is not correct.
Deterioration of potentiometer or some
other part of control motor.
Carry out zero/span adjustment.
Examine and repair control motor.
Problem with power supply or wiring
connection.
Deterioration of control motor.
Deterioration of EM70.
Check power source and wiring connection
(terminals 4, 5 and 6), (terminals 11 and 12),
(terminals 15, 16 and 17).
Examine and repair control motor.
Examine and repair or replace EM70.
Display on the instrument
front panel goes out and the
instrument is unable to be put
in
operation.
Problem with power supply or wiring
connection.
Deterioration of EM70.
Examine power source and wiring connection
particularly for burnout. (Terminals 11,12)
Examine EM70 and repair or replace.
Keys unable to be operated.
Keylock is in effect.
On communication setting screen, the
communication mode ( ) has been set.
Deterioration of EM70.
Release keylock.
Change the communication setting to the local
mode ( ).
Examine and repair or replace EM70.
8-3. Cause of Trouble and Troubleshooting
