OM-610-1002-1 Operator’s Manual Rev 37
PDS-2010 SECTION 6 MAINTENANCE page 51
6.4.6 Detailed Description of Parameters
AHY_1 & AHY_2 - Alarm Hysteresis
An adjustable band on the safe of an alarm point through which the process variable must pass before the
alarm will change state. The high alarm hysteresis band is below the high alarm value, and a low alarm
hysteresis is above the low alarm value.
ALA1 & ALA2 – Alarm Type
Up to three alarm
s are possible on some models. The alarm types may be set as process high or low,
deviation (active above or below controller set point), band (active both above and below set point), or
control loop type. These alarms can be linked to any suitable output
APt - Auto Pre-Tune
This param
eter determines whether or not the controller’s pre-tune facility is activated automatically on
power-up or not (diSA = Disabled, EnAb = Enabled).
ArST - Automatic Reset (Integral Time Constant)
This param
eter is adjustable in the range of 1 second to 99 minutes 59 seconds or OFF (value greater than
the maximum). This parameter is not applicable if the Proportional Band is set to 0 (On/Off control).
bAL_1 & bAL_2 - Band Alarm Value
This parameter, applicable only when Alarm is selected to be a Band Alarm
, defines a band of process
variable values, centered on the set point of the value. If the process variable value is outside this band,
the alarm will be active. This parameter may be adjusted to be within +/- input span from set point.
biAS - Bias (Manual Reset)
This bias to the output power is expressed as a percentage of output power and is adjustable in the range
0%
to 100%. This parameter is not applicable if the Proportional Band is set to 0 (On/Off control).
Cloc, Sloc, and tLoc -Lock Codes
This param
eter defines the four-digit code required to enter Set Up Mode. It may be adjusted in the range
of 0 to 9999.
These parameters define the four-digit codes required to enter Configuration (20), Set-Up (10), and Auto
Tuning (0) modes. The default values are shown in brackets.
Ct1 - Output 1 Cycle Time
The cy
cle time value required is dependent upon the process being controlled and the type of output being
used for Output 1. For a Relay Output, the cycle time should be as large as possible (while remaining
compatible with the process control requirements) in order to maximize relay life. For an SSR Output, the
cycle time may have a lower value (and thus satisfy the requirements of a fast changing process variable
e.g. flow or pressure). The permitted range of value is: .5, 1, 2, 4, 8, 16, 32, 64, 128, 256, 512 seconds.
This parameter is not applicable if Proportional Band 1 is set to 0 or if Output 1 is a DC linear output.
diSP - Display Strategy
This is a controller param
eter; it allows the user to alter the parameters displayed in normal operator
mode. These parameters can be PV + SP, PV + adjustable SP, PV + Ramping SP, PV only, or SP only.
Display strategy 6 will allow read only access to the set point values in Operator Mode; Setup Mode must
then be entered to change the set point.
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