YOKOGAWA UP55A - Page 391

16-6
IM 05P02C41-01EN
Errors

during

Operation

(2)
The errors shown below may occur during operation.
PV

display

(Operation

Display)
Setpointdisplay
(Operation

Display)
Status
indicator
(Operation

Display)
Parameter
that
displays
error
details
Error description Cause and diagnosis Remedy
Normal
indication
RSP
B.OUT –
Setup
parameter
(PV1.E)
Burnout error when RSP
input is used for control
(Loop 1)
Burnout error of analog input connected to
RSP when RSP is used for control computation
Check wiring and sensor.
Error indication is erased in normal operation.
Normal
indication
OUT ----- –
Setup
parameter
(AD2.E)
Feedback input resistor/
current burnout
Feedback input burnout
Check wiring of feedback input resistor/current.
Error indication is erased in normal operation.
Normal
indication
Normal indication
LADDER lamp
blinks
Setup
parameter
(LA.ER)
Laddercalculationoverow
Floating point computation in ladder calculation
isinnite.
Check the ladder program.
Load factor over 100%
Computation does not end within the control
period. (When the load factor is 100% or more,
and the computation does not end within the
control period.)
Change the control period or reduce the
number of steps for the ladder program.
Load factor over 200%.
(Forced end)
Computation does not end within the control
period (load factor is 200% or more).
Change the control period or reduce the
number of steps for the ladder program.
Ladder program error Ladder program is corrupted.
Download the ladder program again. If the
error indication is still not erased, there is a
fault. Contact us for repair.
16.1Troubleshooting