Datasheet
ESG 6.16
Function description
For all the functions the LEDs MIN and MAX are flashing alternating,
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 (mean value of phase-to-phase volta-
ges) 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 (mean value of phase-to-phase volta-
ges) 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
flashes). After the interval has expired (red LED MAX illuminated),
the output relays switch into off-position (yellow LED not illumina-
ted). The output relays again switch into on-position (yellow LED
illuminated) 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 SEQ illumina-
ted), the output relays switch into off-position immediately (yellow
LED not 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 of the phase-to-phase voltages 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).
U
LED MAX
LED MIN
Max
Min
Delay >Delay Delay
U
LED MAX
LED MIN
Max
Min
Delay >Delay Delay
LED SEQ
L1
L2 L3
LED SEQ
L1
L2 L3
LED ASYM
L1
L2 L3
Asym.
3-phase voltage monitoring relay (Multifunction)
EMR DU21C1, EMR DU21D1, EMR DU21B1