YOKOGAWA NEW GREEN SERIES, User Manual

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<Toc> <4. Troubleshooting and Maintenance>
IM 05D01C12-41E 4th Edition: May 31, 2006-00
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Power Failure of more than about 2 seconds
The following show effects caused in “settings” and “operation status.”
Alarm action Continues. Alarm with standby function will enter standby status.
Setting parameter Set contents of each parameter are retained.
Auto-tuning Cancelled.
Control action Differs with setting of setup parameter “R.MD”(restart mode).
R.MD setting Control action after recovery from power failure
CONT
MAN
AUTO
Continues action before power failure. (Factory-set default)
For position-proportional type, when V.MD = Valve position estimating type, starts action
from 0%.
Outputs preset output value (PO) as control output and continues action set before power
failure in MAN mode.
For position-proportional type, when V.MD = Valve position feedback type, starts
action from feedback input condition at recovery from power failure. When V.MD =
Valve position estimating type, starts action from 0%.
For heating/cooling control, starts action from heating-side output value and cooling-
side output value of 50% of control computation output.
Outputs preset output value (PO) as control output and continues action set before
power failure in AUTO mode.
For position-proportional type, when V.MD = Valve position feedback type, starts
action from feedback input condition at recovery from power failure. When V.MD =
Valve position estimating type, starts action from 0%.
For heating/cooling control, starts action from heating-side output value and cooling-
side output value of 50% of control computation output.