YOKOGAWA UP55A - Page 393

16-8
IM 05P02C41-01EN
Errorsduring
Operation(3)
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
0.000 00000
(Decimal point
on the left of the
Symbol display
blinks)
–
Setup
parameter
(OP
.ER)
Peer-to-peer
communication error
Peer-to-peer communication error
Check that the target devices are connected
correctly.
Recovery at normal receipt.
AT,E Normal indication –
Setup
parameter
(PV1.E/PV2.E)
Auto-tuning time-out
(Loop 1, Loop 2)
Auto-tuning does not end even when 24 hours
have elapsed after the start of tuning.
Check the process. Hold down any key to
erase the error indication
VAT,E Normal indication –
Setup
parameter
(AD2.E)
Automatic valve position
adjustmenterror
Fully-closed valve position is equal to or
larger than the fully-open valve position
after automatic valvepositionadjustmentis
performed.
Check wiring and valve. Hold down any key to
erase the error indication.
Normal
indication
0.000 00000
(Decimal point
on the left of the
Symbol display
blinks)
–
Setup
parameter
(OP
.ER)
Communication error
(RS-485 communication)
Framing parity error
Bufferoverow
Inter-character time-out
Checksum error (PC link communication with
checksum)
CRC check error (Modbus/RTU)
LRC check error (Modbus/ASCII)
Check the communication parameters.
Recovery at normal receipt.
Hold down any key to stop blinking.
Normal
indication
0.000 00000
(Decimal point
on the left of the
Symbol display
blinks)
–
Setup
parameter
(OP.ER)
Userproleerror Userproleiscorrupted. Downloadtheuserproleagain.
Normal
indication
Normal indication
Rightmost decimal
point on Symbol
display blinks.
Setup
parameter
(PA.ER)
Faulty FRAM Writing (storing) data to FRAM is impossible. Faulty. Contact us for repair.
16.1Troubleshooting