Chromalox 6040 User Manual

93
Also refer to Alarm Operation, Process High Alarm 2
Value, Process Variable, Scale Range Lower Limit and
Scale Range Upper Limit.
Process High Alarm 2 Value
Type: General Parameter
This parameter, applicable only when Alarm 2 is se-
lected to be a Process High alarm. It is similar to the
Process High Alarm 1 Value.
Display code = PHA2, Default value = Scale Range Up-
per Limit.
Also refer to Alarm Operation, Process High Alarm 1
Value, Process Variable, Scale Range Lower Limit and
Scale Range Upper Limit.
Process Low Alarm 1 Value
Type: General Parameter
This parameter, applicable only when Alarm 1 is se-
lected to be a Process low alarm, defines the process
variable value below which Alarm 1 will be active. Its
value may be adjusted between Scale Range Upper
Limit and Scale Range Lower Limit.
Display code = PLA1, Default value = Scale Range
Lower Limit.
Also refer to Alarm Operation, Process Low Alarm 2
Value, Process Variable, Scale Range Lower Limit and
Scale Range Upper Limit.
Process Low Alarm 2 Value
Type: General Parameter
This parameter, applicable only when Alarm 2 is se-
lected to be a Process low alarm. It is similar to the
Process Low Alarm 1 Value.
Display code = PLA2, default value = Scale Range
Lower Limit.
Also refer to Alarm Operation, Process Low Alarm 1
Value, Process Variable, Scale Range Lower Limit and
Scale Range Upper Limit.
Process Variable (PV)
Type: General Denition
Process Variable is the variable to be measured by the
primary input of the instrument. The PV can be any
parameter that can be converted into an electronic
signal suitable for the input. Common types are Ther-
mocouple or PT100 temperature probes, or pressure,
level, flow etc. from transducers which convert these
parameters into linear DC signals (e.g. 4 to 20mA). Lin-
ear signals can be scaled into engineering units using
the Scale Range Lower Limit and Scale Range Upper
Limit parameters.
Also refer to Input Span, Offset, Scale Range Lower
Limit and Scale Range Upper Limit.
Process Variable Offset
Type: General Parameter
- Refer to Offset.
Rate (Derivative)
Type: Controller Tuning Parameter
Rate is adjustable in the range 0 seconds (OFF) to 99
minutes 59 seconds. It defines how the control action
responds to the rate of change in the process variable.
This parameter should not be used in modulating value
applications as it can cause premature wear due to
constant small adjustments to the valve position. The
Rate parameter is not available if primary control out-
put is set to On-Off.
The Rate parameter is normally set to 0 seconds (OFF)
on Valve Motor Drive controllers because derivative ac-
tion is not usually desirable in these applications.
Display code = rAtE, default value = 1.15.
Also refer to On-Off Control, PID, Process Variable,
Tuning and Valve Motor Drive Control.
Remote Setpoint (RSP)
Type: Controller Denition
Remote Setpoints use the Auxiliary Input option (a sec-
ondary analog input) to adjust a controller’s setpoint
using an external linear DC Voltage or mA input sig-
nal, or in some cases potentiometer or mV inputs. The
Remote Setpoint value is constrained by the Setpoint
Upper Limit and Setpoint Lower Limit settings in the
same way as a local setpoint. Typical applications are
Master/Slave and Cascade Control.
Display code = rSP.
Also refer to Auxiliary Input, Cascade Control, Remote
Input Range, Remote Setpoint Lower Limit, Remote
Setpoint Upper Limit, Setpoint and Setpoint Select.
Remote Auxiliary Input Range
Type: Controller Parameter
Defines the type and range of the linear input signal
(mADC, mVDC, VDC or potentiometer) for the Auxiliary
Input. mVDC and potentiometer are only available with
the Full Auxiliary input module. This input can be used
for Remote Setpoint or Valve Position Indication
Display code = rinP, default value = PHA2 for RSP
inputs and 0
-
10 for Valve Position Indication.
Also refer to Remote Setpoint, Setpoint and Valve Posi-
tion Indication
Remote Setpoint Lower Limit
Type: Controller Parameter
Defines the value of the Remote Setpoint when the
RSP input signal is at its minimum value (e.g. for a 4 to
20mA RSP, the value when 4mA is applied). It may be
adjusted within the range -1999 to 9999; (decimal posi-
tion same as for process variable input). However, the

Chromalox 6040 Specifications

General

Brand	Chromalox
Model	6040
Category	Controller
Language	English