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dt
derivative
time
Derivative Time. Value of the
D
term of the PID control mode, in seconds. Adjustable between 0 and
300.0 seconds.
This parameter is displayed if the
Proportional Band
is
0.
(t
cycle time
PWM Cycle Time. Value in seconds of the PWM cycle period of the PID control. Adjustable between
0.5 and 100.0 seconds. This parameter is displayed if the
Proportional Band
is
0.
Hyst
Hysteresis
Control hysteresis. Hysteresis value for Control ON/OFF mode. Adjustable between 0 and the
measurement range width of the selected input type.
This parameter is displayed only for Control ON/OFF mode (
Pb
=
0
).
Act
Action
Control Logic. Only for Automatic control mode (
Ctr
>>
Auto
).
Re
– Reverse action control. Suitable for
heating
. Turns on the control output when PV is below SP.
Dir
– Direct action control. Suitable for
cooling
. Turns on the control output when PV is above SP.
Sf.st
Soft Start
Soft Start function. Time interval (in seconds) during which the controller limits the control output rise rate
(MV). Adjustable between 0 and 9999 seconds.
This parameter is displayed if the
Proportional Band
is
0.
bias
Bias function. Allows you to change the percentage value of the control output (MV) by adding a value
between -100 % and +100
%.
This parameter is displayed if the
Proportional Band
is
0.
Sp.LL
Setpoint
Low Limit
Allows you to set the lower limit to adjust the SP value.
Allows you to set the minimum value of the PV indication range and limit the SP adjustment for the
available
linear analog inputs
(0-20 mA, 4-20 mA, 0-50 mV, 0-5 V and 0-10 V).
Sp.HL
Setpoint
High Limit
Allows you to set the upper limit to adjust the SP value.
Allows you to set the maximum value of the PV indication range and limit the SP adjustment for the
available
linear analog inputs
(0-20 mA, 4-20 mA, 0-50 mV, 0-5 V and 0-10 V).
ouLL
output Low
Limit
Lower limit for the control output. Allows you to set the minimum percentage value of the control output
when it is set in Automatic control mode (
Ctr
>>
Auto
) and in PID (parameter
PB
0
). Typically set to 0.0
%.
ouHL
output High
Limit
Upper limit for the control output. Allows you to set the maximum percentage value of the control output
when it is set in Automatic control mode (
Ctr
>>
Auto
) and in PID (parameter
PB
0
). Typically set to
100.0 %.
iE.ou
input Error
output
Output value (MV1) when the controller identifies an input error.
Table 7
–
Control cycle
