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 display shows the actual value of the mains voltage and symbols: LV /
HV – voltage below/above the set limit. The sub-illumination of the
LCD-indicator in this mode is jerky. 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
+7) V to (
U
H
-7) 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. Press the «SET»
b
button to enter the mode, exit the mode
–
automatically after 10 seconds after the last pressing of any of the buttons
or by pressing the «ON
»
button.
ENG
26
Voltage Relay
