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ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany, +49 791 504-0, info@ziehl.de, www.ziehl.de
vacuum-cleaners always run correctly and they are
protected from damage by undervoltage or asymmetry.
automatic change of wrong phase-sequence when
connected falsely (2 contactors aorded)
running backward of motors is avoided
no switching on at asymmetry or undervoltage
relay K2 picks up when phase-sequence is cor-
rect
relay K1 picks up (after K2) when symmetry and
voltage is correct
3 LEDs for state of relays and errors
measuring-voltage 3 AC 400 V
limit asymmetry adjustable 5…25 %
limit undervoltage adjustable 70…95 %
alarm-delay adjustable 0,1…10 s (undervoltage
and asymmetry)
no supply-voltage required
Phase Monitoring Type PS - Phase Asymmetry - Phase Sequence
Technical Data
Phase sequence change Relay DRR20
with integrated monitoring of undervoltage and asymmetry
Phase sequence change relays
DRR20 measure the sequence of
the phases and switch – if neces-
sary the rotation of the eld. At the
output (connect relays K1 and K2
in series in this application) two
contactors are connected. The
contactor at the normally-open
contact of K2 switches the pha-
ses 1:1without changing them,
the second (at normally-closed
contact) changes 2 phases.
When switching on with phase-
sequence ok, relay K2 picks up.
With wrong phase-sequence it
remains released. After K2 has
switched, K1 picks up. K1 also
releases rst. This makes sure,
that no wrong contactor can be
picked up under any condition.
Additionally the DRR20 monitors
the three phases for asymmetry
and undervoltage. If the limits
are exceeded, the K1 switches
o (respectively doesn't pick up)
and protects the connected motor
from damage.
The device can also be used as a
monitor for undervoltage, asym-
metry or phase-sequence.
Applications are machines and
equipment that is operated at
variable locations, e.g. at building
sites. Pumps, compressors and
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Rated supply voltage Us
Admissible tolerance Us
Output relay
Type of contact
Output relay
Type of contact
Test conditions
Rated ambient temperature
range
Limit asymmetry
Limit undervoltage
Hysteresis
Delay undervoltage/asymmetry
Delay phase-loss (<60% Us)
Pick-up delay after recovery of
Us
Delay K2 - K1
Dimensions (h x w x d) mm
Fitting position
Attachment
Protection housing / terminals
Weight
3-phase, 400 V without N
+20%...-30%
ca. 3 VA
50/60 Hz
2 change-over contacts (co)
type 2 see "general technical informations"
see"general technical informations"
-20°C...+55°C
adjustable 5...25 %
adjustable 70...95 %
app. 2%
adjustable 0,1...10 s
< 0,2 s
< 0,5 s
app. 100 ms
housing K: 75 x 22,5 x 115 mm
any
on 35 mm DIN rail according to EN 60715 or
2 screws M 4
IP 30/20
150 g
2015-06-23
Drehrichtungsrelais
DRR20
Part number: P222551
