West Control Solutions Pro-EC44 - Manual (Page 59)

Pro-EC44 2-Loop Graphical Profile Controller & Recorder
Pro-EC44 Product Manual - 59540-1 October 2013 Page 52
Secondary Power
Lower Limit The minimum secondary output power limit. The control algorithm will not
allow the power output fall below this level. Adjustable from 0 to 90% but is
always at least 10% below the secondary power upper limit.
Caution: The instrument will not be able to control the process
correctly if the lower limit is above the level required to maintain
setpoint.
Secondary Power
Upper Limit The maximum secondary output power limit. The control algorithm will not
allow the power output rise above this level. Adjustable from 10 to 100%
but is always at least 10% above the secondary power lower limit.
Caution: The instrument will not be able to control the process
correctly if the upper limit is below the level required to maintain
setpoint.
Sensor Break Pre-set
Power Output Set the power level to be applied if the process input signal or an active
remote setpoint input is lost. Adjustable from 0 to 100% for single control or
-100 to +100% for dual control. The default value is OFF (0% power). Does
not apply if control is disabled or in manual mode.
Caution: Ensure the value set will maintain safe process conditions.
Motor Travel Time The motor travel time (valve movement time from fully open to fully closed
in mm:ss). Adjustable from 5s to 5 mins - In VMD Control Mode only.
Minimum Motor On
Time The minimum drive effort (in seconds) to begin moving the motorised valve
in VMD Control Mode. Adjustable from 0.02 to of the Motor Travel Time.
Valve Open Limit The maximum position the controller will attempt to drive the valve to in
VMD Control Mode. Adjustable from the valve close limit+1% to 100.0%
(fully open) - Only possible if the 2
nd
input is used for valve feedback.
Valve Close Limit The minimum position the controller will attempt to drive the valve to in
VMD Control Mode. Adjustable from 0.0% (fully closed) to the valve open
limit-1% - Only possible if the 2
nd input is used for valve feedback.
Valve Sensor Break
Action The direction to drive the valve if the process input signal or an active
remote setpoint input is lost. The default action is to drive the valve closed.
– Applies to VMD Control Mode only. Does not apply if control is disabled
or in manual mode.
Caution: Set to safe values for the process!
Setpoint Lower Limit The minimum allowable setpoint value. Adjustable within the scaled input
limits, but cannot be above the setpoint upper limit. Applies to local, remote
and profile setpoints.
Caution: Set to safe values for the process. Operators can adjust
local setpoints to any value between the limits set.
Setpoint Upper Limit The maximum allowable setpoint value. Adjustable within the scaled input
limits, but cannot be below the setpoint lower limit. Applies to local, remote
and profile setpoints.
Caution: Set to safe values for the process. Operators can adjust
local setpoints to any value between the limits set.
Setpoint Ramp Rate Setpoint Ramp Rate value, adjustable from 1 to 9999 display units per
hour, or OFF. The ramp is applied at power-up (from current PV to SP) and
whenever the setpoint value or source is changed. If set to OFF, the
setpoint steps immediately to the new setpoint value.
Main Setpoint Source Select the source of the main setpoint. This can only be a “Local” setpoint
set from the keypad, or Not used.
Alternate Setpoint
Source Select the source of the alternate setpoint. This can be a “Local” setpoint,
not used, or an analogue remote setpoint (RSP) signal applied to input 2 or
auxiliary input A
– depending on available hardware.
Main Setpoint Value Sets the current value of the main setpoint between the setpoint upper and
lower limits.
Alternate Setpoint
Value Sets the current value of the alternate setpoint between the setpoint upper
and lower limits
– is read-only if alternate setpoint source is RSP.