Figure 23 Event control function (ON/OFF delay)
1 High alarm 4 OFF delay
2 Low alarm 5 Time (x-axis)
3 ON delay 6 Source (y-axis)
• Pulse Width Modulation Control Function (refer to Figure 24)
Option Description
Set mode Auto—the relay output works as a PID controller.
Manual—the signal is controlled by the user through manual
adjustment of the % change value. This option is shown as
Manual Output after the manual set mode is selected.
Phase Reverses the leading sign of the control deviation for the PID
controller (default: Reverse). The phase selects whether the
relay will operate at the first part of a cycle (direct phase) or
the second part (reverse phase).
Set setpoint Creates a setpoint value.
Dead zone The range above and below the setpoint. In this set range, the
PID controller does not take action to change the Pulse Width
Modulation On/Off Ratio output signal until the limits of the
dead zone are reached.
Period Sets the cycle duration of the PWM output signal (default:
5 seconds).
Min width Sets the minimum PWM ratio (default: 1.0 second).
Max width Sets the maximum PWM ratio (default: 4.0 seconds).
Prop band Sets the proportional part of the PID controller. The
proportional part of the controller supplies an output signal
which is linearly dependent to the control deviation. The
proportional part reacts on any changes at the input but starts
to oscillate easily if the value is set high. The proportional part
cannot completely compensate for disturbances.
Integral Sets the integral part of the PID controller (default:
000 minutes). The integration part of the controller supplies an
output signal. The output signal increases linearly if the
control deviation is constant. The integration part responds
slower than the proportional part and can completely
compensate disturbances. The higher the integration part, the
slower it responds. If the integration part is set too low, it starts
to oscillate.
34 (nglisK
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