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Chromalox 8003 User's Manual 11
td Derivative (rate), range 1 second to 9 minutes
and 59 seconds. If 0, derivative is disabled.
C Heating cycle time, range 1 to 200 seconds (30
seconds or greater recommended for relay outputs).
C2 Cycle Time for Output 2 (heat/cool control
selected), range 1 to 200 seconds (30 seconds
or greater recommended for relay outputs).
rC Relative cooling gain (for heat/cool) control
range 0.20 to 1.00.
OLP Overlap/Deadzone (for heat/cool) Positive value
is amount of overlap; negative value separation
between heat and cool Pbs, range -20 to 50% of Pb.
rL SP minimum value (low limit)
rH SP maximum value (high limit)
rP Ramp on setpoint changes, range 1 to 100
degrees/minute or blank (step change).
OLH Output power max. value, range 0 to 100%
heating, -100 to 100% heat/cool, limits power
continuously (tOL = blank) or on startup per
tOL settings.
tOL Time interval for OLH power output limit, range
1 to 100 minutes or if blank infinite. The timer
starts if the actual temperature is less than P15
(threshold value).
8003 Operator Parameters
Push the FUNC pushbutton. The lower display shows the cue,
the upper display shows the value of the selected parameter.
Cue Description
SP Control Setpoint, range from "rL" to "rH".
nnn Software key for parameter protection set in
Conf mode P18.
A1 Alarm 1 Setpoint, range from Conf mode P2 to P3.
A2 Alarm 2 Setpoint, range from Conf mode P2 to P3.
H1 Alarm 1 hysteresis (deadband) 0.1 to 10.0% of
alarm span.
H2 Alarm 2 hysteresis (deadband) 0.1 to 10.0% of
alarm span.
Pb Proportional Band, range from 1.0 to 99.9% of
span for heating output, 1.5 to 99.9% of span
for heating/cooling output. If Pb = 0, ON/OFF
control is enabled and ti, td, C, C2, rC, OLP,
OLH and IOL are not displayed.
HS Hysteresis (deadband) for ON/OFF control
(active if Pb = 0), range 0.1 to 10.0% of span.
ti Integral time (automatic reset), range 1 minute
and 20 seconds to 20 minutes and 00 seconds,
or if blank integral is disabled.
8003 Manual 4/27/06, 2:24 PM11