Autonics TK4L - Page 57

6 Parameter Settings and Functions
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6.2.1.3 Heating and Cooling Control [PAR3 → O-FT → H-C]
Heating and cooling control mode: heating and cooling with a single temperature
controller when it is difficult to control subject temperature with only heating or cooling.
Heating and cooling control mode controls the object using different PID time constants
for each heating and cooling.
It is also possible to set heating and cooling control in both PID control or ON/OFF control
mode. Heating/cooling output can be selected among Relay output, SSR output and
current output depending on model types choosen according to your application
environment. (Note that only standard SSR control is available for SSR output in OUT2.)
For heating and cooling control, OUT1 control output is dedicated to
heating control and OUT2 control output to cooling control.
6.2.1.3.1. Dead band/Overlap Band [PAR2 → DB]
 In heating and cooling control, it is possible to designate a dead band between
heating and cooling control bands based on SV (Setting Value).
 A dead band forms around the SV when DB is set to a positive value. No control
occurs in the dead band area. Therefore, heating and cooling MVs become 0.0% in
the formed dead band.
 An overlap band (simultaneous application of heating and cooling MVs) forms around
the SV when
DB is set to a negative value.
 Set DB to 0 when a dead band or an overlap band is not used.
Setting
Group
Parameter Setting Range
Factory
Default
Unit
PAR2
DB
See below.
See
below.
 PID/PID, PID/ON-OFF, and ON-OFF/PID Control
 Setting Range (Temperature): -(Proportional Band) to +(Proportional Band) (the
lower value when using different proportional bands)