Selecting The Control Mode; Standard Control; Heating/Cooling Control - Omron E5AR-T User Manual

4.6 Selecting the Control Mode

The control mode allows various types of control to be performed. The control mode is set to standard
control by default.

■ Standard Control

■ Heating/Cooling Control

● Dead Band
Output
100%
Heating
0%
Heating P
• Standard heating or cooling control is performed. The Direct/
Reverse Operation parameter is used to select heating (reverse
operation) or cooling (direct operation).
• When using PID control, the Proportional Band (P), Integral Time (I),
and Derivative Time (D) parameters must be set.
These PID constants can be set either using auto-tuning (AT) or
manually.
• When the proportional band (P) is set to 0.00%, control becomes
ON/OFF control.
• Heating and cooling control is performed.
• When using PID control, in addition to the Proportional Band (P),
Integral Time (I), and Derivative Time (D) parameters, the Cooling
Coefficient and Dead Band parameters must also be set.
The PID constants can be set either using auto-tuning (AT) or
manually. The Cooling Coefficient and Dead Band parameters must
be set manually.
• When the proportional band (P) is set to 0.00%, control becomes
ON/OFF control and 3-position control is possible.
The dead band is set centered on the set point. The dead band width
is set in the Dead Band parameter in the Adjustment Level. A negative
setting sets an overlap band.
Dead band:
Dead band width =
Positive value
Cooling
PV
Cooling P
SP
• The default dead band is 0.00.

4.6 Selecting the Control Mode

Output
100%
Heating
0%
Heating P
SP
Overlapping band:
Dead band width =
Negative value
Cooling
PV
Cooling P
4-15