Despatch P1400+ Temperature Controller - Manual (Page 95)

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Set Valve Opened Position Type: VMD Controller Parameter
When Valve Position Indication is to be used on Valve Motor Controllers, this parameter defines the
input value that will be measured by the Auxiliary Input, when the valve is fully opened. The valve
must driven to its “Open” end stop before setting this parameter.
It must not be used to limit valve movement, separate Valve Close and Open Limit parameters are
available for this purpose.
Display code =
PcLL , default setting = Auxiliary Input Range Maximum.
Also refer to Auxiliary Input , Set Valve Closed Position , Valve Close Limit , Valve Open Limit ,
Valve Motor Control and Valve Position Indication .
Setpoint Type: Controller Definition
The target value at which a controller will attempt to maintain the process variable by adjusting its
power output level. Controllers can have either one or two setpoints. These can be one or two local
internal setpoints (
SP or SP1 and SP2 ), or one local internal setpoint ( LSP ) and one externally
adjusted remote ( RSP ) setpoint, if a Remote Setpoint module is fitted. The value of the setpoints can
be adjusted between the Setpoint Upper Limit and Setpoint Lower Limits. The active setpoint is
defined by the status of the Setpoint Select parameter or a digital input.
Also refer to
Limit Setpoint , Process Variable , Remote Setpoint , Scale Range Lower Limit ,
Setpoint Lower Limit , Setpoint Upper Limit and Setpoint Select
Setpoint Upper Limit Type: Controller Parameter
The maximum limit allowed for operator setpoint adjustments. It should be set to keep the setpoint
below a value that might cause damage to the process. The adjustment range is between Scale
Range Upper Limit and Scale Range Lower Limit. The value cannot be moved below the current
value of the setpoint.
Display code =
SPuL , default value is Scale Range Upper Limit.
Also refer to Scale Range Lower Limit , Scale Range Upper Limit , Setpoint and Setpoint Lower
Limit .
Setpoint Lower Limit Type: Controller Parameter
The minimum limit allowed for operator setpoint adjustments. It should be set to keep the setpoint
above a value that might cause damage to the process. The adjustment range is between Scale
Range Lowe Limit and Scale Range Upper Limit. The value cannot be moved above the current
value of the setpoint.
Display code =
SPLL , default value = Scale Range Lower Limit.
Also refer to Scale Range Lower Limit , Scale Range Upper Limit , Setpoint and Setpoint Upper
Limit .
Setpoint Ramping Enable Type: Controller Parameter
Enables or disables the viewing and adjustment of the Setpoint Ramp Rate in Operator Mode. This
parameter does not disable the ramping SP feature; it merely removes it from Operator Mode. It can
still be viewed and adjusted in Setup Mode. To turn off ramping, the ramp rate must be set to OFF
(blank).
Display code =
SPr , default setting = Disabled.
Also refer to Process Variable , Setpoint and Setpoint Ramp Rate .
Setpoint Ramp Rate Type: Controller Parameter
The rate at which the actual setpoint value will move towards its target value, when the setpoint
value is adjusted or the active setpoint is changed. With ramping in use, the initial value of the actual