8. OPERATION
The voltage relay has the following operation modes:
- normal operation;
- protection mode;
- turn-on delay mode;
- parameter settings mode.
The voltage relay is in the normal operation mode, when the active power
supply voltage is within the range of voltage actuacion protection
thresholds having been set by a user and the turn-on delay time is over. In
this mode the protected equipment is connected to the power supply
network and active voltage in the network is displayed continuously.
If the voltage exceeds the set thresholds, the relay enters the protection
mode. In this mode the equipment connected to the relay is de-energized.
The “Hi” symbol and voltage value in the power supply network will blink by
turns on the display (on operation of high voltage protection) or the “Lo”
symbol and voltage value in the power supply network (on operation of low
voltage protection). The voltage relay will be in this mode as long as the
voltage in the power supply network returns to the range of values from
(U
L
+5) V to (
U
H
-5) V.
The relay enters the turn-on delay mode after its connection to the network
or when it leaves the protection mode. In this mode the equipment con-
nected
to the relay is de-energized and the countdown time of turn-on
delay is displayed. When the time is over the relay enters the normal ope-
ration mode.
The parameter settings mode is used to adjust protection actuacion para-
meters. To enter this mode press and hold the button “SET”
b
within
3 sec, the mode is over automatically in 5 seconds after the last pressing of
any button.
ENG
8
Voltage Relay
