535-PROF User's Manual
Chapter 7
99
Applications
Closing input changes active setpoint to remote setpoint. Opening
reverts controller to previous setpoint. Override by selecting a differ-
ent setpoint via the
SP SELECT
parameter (in the
TUNING
menu), a
communications command, or other digital inputs.
•
MANUAL
Closing input trips the controller to manual. Opening input reverts con-
troller to automatic. Override by using
MANUAL
key, a communica-
tions command, or “trip to automatic” function.
•
2ND. SETPT.
Closing input changes active setpoint to the 2nd local setpoint. Open-
ing input reverts controller to previous setpoint digital input. Override
by selecting a different setpoint via the
SP SELECT
parameter (in
the
TUNING
menu), a communications command, or other digital in-
puts.
•
2ND. PID
Closing input changes active set of PID values to 2nd set. Opening
input bases active set of PID on rules defined in
PID TRIP
and
TRIP:1
to
TRIP:8
. Override input only by directly linking PID set to the active
setpoint and changing the active setpoint.
•
ALARM ACK.
Closing input acknowledges all active alarms. Opening input “rearms”
the controller. If the digital input remains closed, it
does not continue
to immediately acknowledge alarms as they become active.
•
RST. INHBT.
Reset Inhibition. Closing input deactivates “I” (integral) term, regard-
less of the PID values being used. Opening input activates “I” term
(if applicable).
•
D.A./R.A.
Direct Acting/Reverse Acting. Closing input reverses action of the
first control output (from direct to reverse, or reverse to direct). Opening
reinstates original action.
•
STOP A/T
Closing input temporarily disables Adaptive Tuning. Opening input
enables it.
•
LOCK. MAN.
Closing contact places the controller in manual control at the desig-
nated output percentage. All locked manual contacts must be opened
in order to return controller to automatic control.
•
UP KEY / DOWN KEY
Closing the contact mimics the designated or
key. Useful if
controller is mounted behind a window; contact push-buttons can be
used to change setpoint values.
•
DISP. KEY
Closing contact mimics the
DISPLAY
key; scroll through display of
the Setpoint, Deviation % and Output%.
•
FAST KEY
Closing contact mimics the
FAST
key . Use in conjunction with
, , DISPLAY
and
MENU
keys.
NOTE:
Only alarms configured to be
acknowledged are affected by this
digital input.
NOTE:
The second display does not
change when tripping to manual from
a closed digital input.
