9
The parameters presented on PAGE-10 depend upon the type of algorithm selected for the control purpose, viz., On-Off,
Pulsed On-Off and PID. The parameter list further extends if the selected control mode is bi-directional (that is, heat-cool
control). Refer Table 4.1 for the parameter descriptions and settings.
CONTROL PARAMETERS
Table 4.1
Visit www.ppiindia.net. Refer technical notes on CONTROL and TUNING for detailed understanding of the
parameters / terminologies used for describing control parameters in this section.
0 to 600 Seconds
(Default : 16 Sec.)
0 to 3600 Seconds
(Default : 100 Sec.)
PROPORTIONAL BAND
(Available for PID Control only)
Sets proportional gain (% power per unit error). Defined in same
units and resolution as that for PV.
INTEGRAL TIME
(Available for PID Control only)
Sets integral time constant in Seconds. Setting the value to 0,
cuts-off the integral action.
DERIVATIVE TIME
(Available for PID Control only)
Sets derivative time constant in Seconds. Setting the value to 0,
cuts-off the derivative action.
1 to 999 Units
(Default : 50 units)
Settings
(Default Value)
Parameter Description
0.5 to 100.0 Seconds
(in steps of 0.5 secs.)
(Default : 10.0 Sec.)
0.1 to 10.0
(Default : 1.0)
0.5 to 100.0 Seconds
(in steps of 0.5 secs.)
(Default : 10.0 sec.)
1 to 999
(Default : 2)
HYSTERESIS
(Available for On-Off or Pulsed On-Off Control only)
Sets differential (dead) band between On-Off switching for OP1.
(Available for PID Control with bi-directional, that is, Heat-Cool mode)
Sets the On + Off cycle time in Seconds for time proportional
power output through Relay / SSR for OP2.
*
COOL CYCLE TIME
(Available for PID Control with bi-directional, that is, Heat-Cool mode)
Sets the ratio of cooling power to the heating power.
*
RELATIVE COOL GAIN
CYCLE TIME
(Available for PID Control only)
Sets the total ‘On + Off’ time in Seconds for time proportional
power output through Relay / SSR for OP1.
Pulse ON Time
to 120.0 Seconds
(Default : 2.0 sec.)
PULSE TIME
(Available for Pulsed On-Off Control only)
Sets the total ‘On + Off’ pulse time in Seconds for Relay / SSR
output for OP1.
User Manual
EPSILON
Section 4
