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ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany, +49 791 504-0, info@ziehl.de, www.ziehl.de
12 inputs (for transformer STWA1)
2 of these inputs with adjustable switching
threshold AC 0,5...5 AA
12 outputs (Open Collector) max. DC 40 V/40 mA
relay OR-linked (of all 12 inputs)
LED displays (1/channel)
Multiplex operation possible
Applications:
The current relay STW12 is used where AC-current
yes/no has to be evaluated, however, the exact value
of the current is not relevant. Examples are the control
of machines in suction plants or monitoring of the
mode of operation of loads (on, o or damaged). The
STW12 is suitable in particular for being used in con-
nection with a PLC.
Current-Relay STW12
AC-Detection, 12-channel, Single evaluation, OR-Circuit
Technical Data
The current relay STW12 moni-
tors the current ow yes/no of up
to 12 alternating-current circuits.
If there is an AC-current of ≥1 A
through a connected transformer
STWA 1, the according output
transistor switches and the yellow
LED lights up.
All the OR inputs are linked at the
same time. If a current is identied
in at least one of the monitored
current circuits, a relay (1 change-
over contact) picks up.
The STW12 is installed at an
open printed circuit board. The
lower part can be used for snap-
fastening on a 35 mm DIN-rail or
for screw fastening (option). The
supply voltage is DC 24.
This voltage can be used at the
same time for inquiry of the output
transistors. When requesting the
outputs in 2 groups in multiplex
operation, only 8 I/Os of the PLC
are needed.
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Power supply Us
Function
Transformer input
Overload cap.continous/max 10s
Switching points E1, E2
Tolerance
Switching points E3...E12
Switch-o delay
Switch-on delay
Output relay
Type of contact
Open Collector
Testing conditions
rated ambient temperature range
Dimensions H x B x T
Attachment
Protection housing / terminals
Weight
DC 20 - 30 V, < 2 VA
12-channel single/OR
1…12, type STWA 1
100 A / 300 A
adjustable, AC 0,5...5 A
± 20%
on ≤ AC 1 A
o ≥ AC 0,3 A
10 s.
approx. 0,5 s.
1 CO, 12 x Open-Collector
type 2 see "general technical informations"
max. DC 40 V/40 mA
see "general technical informations"
-20°C…+55°C
design V 6: 90 x 105 x 32 [mm], 37-pole
on 35 mm DIN rail according to DIN EN 50 022 or with
screws M4 (option)
IP 30 / IP 20
approx. 135 g
Voltage Monitoring Type SW
GNDGND GND GND E1 E2 E3 E4 E5 E6 E7 E8 E9 E10 E11 E12 18 15 16
GND +24V A1 A2 A3 A4 A5 A6 A7 A8 A9 A10 A11 A12GND +24V I1 I2
24V
–
+
≥1
1 .... 12 Stromwandler/ current transformer STWA1(H)
STWA1H (+) = E1...E12
STWA1H (-) = GND
2015-09-04
STW12
Part number:
S225127 DC 20-30 V
