YOKOGAWA UP35A User Manual

15-1
IM 05P02D41-01EN
Power Failure Recovery Processing / Setting Power Frequency / Other Settings
15
15.1 RemediesifPowerFailureOccursduring
Operations
Description
The operation status and remedies after a power failure differ with the length of power
failure time:
Regardless of the length of power failure time, all functions of the controller cannot be
operated for about 10 seconds after recovery. However, the case of instantaneous power
failure is excepted.
• 100–240 V AC: Instantaneous power failure of 20 ms or less
• 24 V AC/DC: Instantaneous power failure of 1 ms
A power failure is not detected. Normal operation continues.
• Power failure of about less than 5 seconds
The following shows effects caused in “settings” and “operation status.”
Alarm action
Does not continue. Alarm with stand-by function will enter stand-by status.
Alarmlatchwillbeinitialized.
Setting parameter Set contents of each parameter are retained.
Auto-tuning Cancelled.
Control action Action before power failure continues.
Timer, counter (ladder
program)
Initialized.
• Power failure of about 5 seconds or more
The following shows effects caused in “settings” and “operation status.”
Alarm action
Does not continue. Alarm with stand-by function will enter stand-by status.
Alarmlatchwillbeinitialized.
Setting parameter Set contents of each parameter are retained.
Auto-tuning Cancelled.
Control action
Differs with setting of the parameter “R.MD” (restart mode).
R.MD setting Control action (control output and operation mode)
after recovery from power failure
CONT Continues action before power failure. (Factory default)
MAN
(*)
Outputs the preset output value (PO) of the PID group
used as control output and continues action in MAN
mode. Continues operation mode (RESET, PROG, or
LOCAL)
RESET
(*)
The control computation is executed in RESET mode
based on the preset output value (PO) of the PID group
used as control output.
* In Heating/cooling control, starts action from 50% of control computation
output.
Timer, counter (ladder
program)
Initialized.
SettingDetails
Parameter
symbol
Name
Display
level
Settingrange Menusymbol
R.MD Restart mode STD
CONT: Continue action set before
power failure.
MAN: Start from MAN.
RESET: Start from AUTO and
RESET. The preset output
value is outputted.
SYS
Chapter15PowerFailureRecoveryProcessing/PowerFrequencySetting/OtherSettings

YOKOGAWA UP35A Specifications

General

Brand	YOKOGAWA
Model	UP35A
Category	Controller
Language	English