SATEC C192PF8-RPR - Manual (Page 58)

Chapter 5 PFC Setup and Operation 53
5.3.2 PFC Protection Setpoints
Protection against Voltage Interruptions
The fast disconnection of the capacitor banks is required in the event of short-
term voltage interruptions that would cause damage to the still-charged
capacitors when the voltage is restored.
The No-Volt alarm override condition (see Table 4.6) along with the Hard Switch-
Off action can de-energize the output relays in approximately 25 ms whenever
voltage interruption is detected.
From the Event/Alarm Setpoints Menu, set the setpoint parameters as follows:
Trigger = no-U
Operate Limit = none
Release Limit = none
Operate Delay = 0
Release Delay = 3.0 sec
Action
= Hrd.OF
The setpoint release delay defines the amount of time before the PFC returns to
normal operation after the alarm. Set it to a non-zero value (3.0 sec in the above
example).
Over-voltage Protection
Over-voltage override condition prevents damage to capacitors at high voltage
increases that would be caused by faulty connections of the capacitors or by
voltage resonance at a higher frequency.
The high voltage override condition along with the Soft Switch-Off action is
recommended for over-voltage protection. The setpoint can respond to high
measured voltage over 120% of the operating voltage with response time of 0.3
to 300 sec. The setpoint is released without a delay when the voltage returns to a
level of 105-110% of the operating voltage. To avoid non-necessary
disconnecting of the banks, the setpoint is released immediately when the alarm
condition disappears.
From the Event/Alarm Setpoints Menu, set the setpoint parameters as follows (example):
Trigger = r.hi. U
Operate Limit = 115-120% of the operating voltage
Release Limit = 110% of the operating voltage
Operate Delay = 10 sec
Release Delay = 0
Action
= SFt.OF
After the alarm, the PFC will not return to automatic operation for a period of time that is
50 times the power factor setpoint operate delay.