Datasheet

ESG 5.20
Function description
For all the functions the LEDs MIN and MAX are flashing alterna-
ting, when the minimum value for the measured voltage was chosen
to be greater than the maximum value.
If a failure already exists when the device is activated, the output
relays remain in off-position and the LED for the corresponding
threshold is illuminated.
Under voltage monitoring (UNDER, UNDER+SEQ)
When the measured voltage (one of the phase voltages) falls
below the value adjusted at the MIN-regulator, the set interval of
the tripping delay (DELAY) begins (red LED MIN flashes). After the
interval has expired (red LED MIN illuminated), the output relays
switch into off-position (yellow LED not illuminated). The output
relays again switch into on-position (yellow LED illuminated), when
the measured voltage exceeds the value adjusted at the MAX-
regulator.
Window function (WIN, WIN+SEQ)
The output relays switch into on-position (yellow LED illuminated)
when the measured voltage (one of the phase voltages) exceeds
the value adjusted at the MIN-regulator. When the measured
voltage exceeds the value adjusted at the MAX-regulator, the set
interval of the tripping delay (DELAY) begins (red LED MAX flas-
hes). After the interval has expired (red LED MAX illuminated), the
output relays switch into off-position (yellow LED not illuminated).
The output relays again switch into on-position (yellow LED illumi-
nated) when the measured voltage falls below the value adjusted at
the MAX-regulator (red LED MAX not illuminated). When the
measured voltage falls below the value adjusted at the MIN-
regulator, the set interval of the tripping delay (DELAY) begins
again (red LED MIN flashes). After the interval has expired (red LED
MIN illuminated), the output relays switch into off-position (yellow
LED not illuminated).
Phase sequence monitoring (SEQ)
Phase sequence monitoring is selectable for all functions.
If a change in phase sequence is detected (red LED Asym./SEQ
flashes), the output relays switch into off-position after the interval
has expired (yellow LED not illuminated, red LED Asym./SEQ
illuminated.
Phase failure monitoring (SEQ)
If one of the phase voltages fails, the set interval of the tripping
delay (DELAY) begins (red LED SEQ flashes). After the interval has
expired (red LED SEQ illuminated), the output relays switch into
off-position (yellow LED not illuminated).
Reverse voltages of a consumer (e.g. a motor which continues to
run on two phases only) do not effect the disconnection but can be
monitored by using a proper value for the asymmetry.
Asymmetry monitoring
If the asymmetry between the phases exceeds the value set at the
ASYM-regulator, the set interval of the tripping delay (DELAY)
begins (red LED ASYM flashes). After the interval has expired (red
LED ASYM illuminated), the output relays switch into off-position
(yellow LED not illuminated).
3-phase voltage monitoring relay (Multifunction)
EMR SU31C1, SU31D1
U
LED MAX
LED MIN
Max
Min
Delay >Delay Delay
U
LED MAX
LED MIN
Max
Min
Delay >Delay Delay
LED Asym/Seq
L1
L2 L3
Delay
LED Asym/Seq
L1
L2 L3
LED Asym/Seq
L1
L2 L3
Asym