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V Function diagrams
English
a) ON-delayed over- and undervoltage monitoring,
1 x 2 c/o contacts
b) OFF-delayed over- and undervoltage monitoring,
1 x 2 c/o contacts
c) ON-delayed over- and undervoltage monitoring,
2 x 1 c/o contact
d) OFF-delayed over- and undervoltage monitoring,
2 x 1 c/o contact
e) ON-delayed phase unbalance monitoring
f) OFF-delayed phase unbalance monitoring
g) Phase sequence and phase failure monitoring
h) Automatic phase sequence correction
Control supply voltage / Three-phase measuring voltage
Threshold value
Measured value
Threshold value
Output relays 1
Output relay 2
Red LED
Red LED
Yellow LED
Start-up delay t
S
, fixed
Tripping delay tv, adjustable
Start-up delay t
S1
of R1, fixed
Start-up delay t
S2
of R2, fixed
Threshold values for over- and undervoltage
EMR5-AWN280-1:
L1-L2-L3-N 180-280 V U
min
= 180-220
V
U
max
= 240-280 V
EMR5-AWN500-1:
L1-L2-L3
300-500
V U
min
= 300-380
V
U
max
= 420-500 V
EMR5-AWM580-2:
L1-L2-L3
350-580 V U
min
= 350-460
V
U
max
= 480-580 V
EMR5-AWM720-2:
L1-L2-L3
450-720 V U
min
= 450-570
V
U
max
= 600-720 V
EMR5-AWM820-2:
L1-L2-L3
530-820 V U
min
= 530-660
V
U
max
= 690-820 V
Threshold values for phase unbalance
Switch-off value:
L1-L2-L3: 2-25 % (unbalance value in percentage)
Unbalance value in percentage =
Max. difference_L1,L2,L3
*
100 %
Average value_L1,L2,L3
Switch-on value:
Set switch-off value -20%
Operating principle
EMR5-AW are multifunctional monitoring relays for three-phase
mains. They monitor all phase parameters such as phase sequence,
phase failure, over- and undervoltage and phase unbalance.
EMR5-AWN280-1 is also suitable for monitoring single-phase mains
(see ‚Electrical connection‘).
Over- and undervoltage, 1 x 2 c/o contacts
If all three phases are present with correct voltage, the output
relays are energized. If the voltage to be monitored exceeds or
falls below the set threshold value, the output relays de-energize
instantaneously or delayed (0.1-30 s), depending on the set time
delay. The fault type is indicated by LEDs. The output relays re-
energize automatically, instantaneously or with delay (0.1-30 s),
depending on the set time delay, as soon as the voltage returns to
the tolerance range, taking into account a fixed hysteresis of 5 %.
Over- and undervoltage, 2 x 1 c/o contact
If all three phases are present with correct voltage, the output re-
lays are energized. If the voltage to be monitored exceeds the set
threshold value, output relay R1 de-energizes instantaneously or
delayed (0.1-30 s), depending on the set time delay. If the voltage
to be monitored falls below the set threshold value, output relay
R2 de-energizes instantaneously or delayed (0.1-30 s), depending
on the set time delay. The fault type is indicated by LEDs. The
output relays re-energize automatically, instantaneously or with
delay (0.1-30 s), depending on the set time delay, as soon as the
voltage returns to the tolerance range, taking into account a fixed
hysteresis of 5 %.
Phase unbalance
If all three phases are present with correct voltage, the output
relays are energized. If the phase unbalance of the phases to
be monitored exceeds the set unbalance threshold value, the
output relays de-energize instantaneously or delayed (0.1-30
s), depending on the set time delay. The fault type is indicated
by LEDs. The output relays re-energize, instantaneously or with
delay (0.1-30 s), depending on the set time delay, as soon as the
voltage returns to the tolerance range, taking into account a fixed
hysteresis of 20 %.
Phase sequence and phase failure
If all three phases are present with correct phase sequence, the
output relays are energized. They de-energize immediately if a
phase failure or a phase sequence error occurs. The fault type is
indicated by LEDs. The output relays re-energize automatically as
soon as the voltage returns to the tolerance range.
Automatic phase sequence correction
Applying control supply voltage / three-phase measuring voltage
with correct phase sequence, energizes output relay R2 when the
fixed start-up delay t
S2
of about 200 ms is complete. Relay R2
remains de-energized if the phase sequence is incorrect.
If all three phases are present with correct voltage, output relay
R1 energizes when the fixed start-up delay t
S1
of about 250 ms is
complete. If the voltage to be monitored exceeds or falls below the
set threshold values for phase unbalance, over- or undervoltage
or if a phase failure occurs, output relay R1 de-energizes.
Output relay R2 is responsive only to a false phase sequence. In
conjunction with a reversing contactor combination, this enables
an automatic correction of the rotation direction (see circuit
diagram on page 10).
The operating mode ‚Automatic phase sequence correction‘
can be selected only when ‚Phase sequence monitoring
activated‘ (DIP2: OFF) and ‚2 x 1 c/o contact‘ (DIP3: ON) is
selected.
With the operating mode ‚Automatic phase sequence
correction‘, the phase sequence error has the lowest error
priority for the status indication.
