Instruction manual

OTC25 P
O p e r a t i o n
17
OTC25 P
O p e r a t i o n
16
temperature as a compensation for offsets between the true
temperature and the temperature seen by the thermocouple.
Proportional Band
Proportional Band is a PID parameter that represents the
amount of deviation of the controlled variable required to move
through the full range, expressed in % of span or degrees of
temperature. This parameter can also be expressed as “Gain”
(the wider the band, the lower the gain).
Rate
Rate is a PID parameter (Derivative Action) that produces a
corrective signal proportional to the rate at which the controlled
variable is changing. It is used to correct for overshoot and
undershoot.
Reset
Reset is a PID parameter (Integral Action) that produces a
corrective signal proportional to the length of time and
magnitude that the controlled variable has been off setpoint.
It is used to accommodate load changes.
Heat Cycle Time
Heat Cycle Time is displayed in seconds, and can be set from
0 to 120 seconds. A setting of zero represents a heat cycle
time of 300 milliseconds.
Cool Cycle Time
Cool Cycle Time is displayed in seconds, and can be set from
0 to 120 seconds. A setting of zero represents a cool cycle
time of 300 milliseconds. This menu parameter will only be
displayed if output 2 is configured to be a cool output.
Deviation Band Alarm
A Deviation Band is a pre-set number of degrees, plus and
minus, around the Setpoint Value, ex.
+
10° F. A Deviation Band
A l a r m provides an indication to the operator that the actual
t e m p e r a t u r e has either exceeded or dropped below the chosen
deviation. This parameter can be turned off or adjusted
f rom 1 to 252° F (1 to 140° C). When the process variable is
outside the deviation band, the alarm is indicated by flashing the
display (re g a rdless of whether setpoint or actual temperature is
displayed and activating an output, if configured as such).
Output 2 Configuration
Output 2 may be configured as either a control output or as an
alarm output for the deviation band alarm. When configured for
control, output 2 acts as a cool PID output. When configured
for an alarm, output 2 is activated when the deviation alarm is
active and deactivated when the deviation alarm is inactive.
Display Units
This allows the operator to have the display indicate either
degrees Fahrenheit or degrees Celsius.
Input Type
Sensor input type may be either a Type J or Type K
thermocouple.