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ZIEHL industrie-elektronik, 74523 Schwäbisch Hall, Germany, +49 791 504-0, info@ziehl.de, www.ziehl.de
Application: The STWA1FH enables moderately priced
detection of the value of an AC-current with a DIGITAL
INPUT of a PLC. Costly analogue inputs are no longer
necessary.
The STWA1FH is particularly suitable to evaluate the
current in electric motors in machines of i.e. saws. The
feed can be regulated dependent from the load of the
motor of the saw.
current-proportional frequency output 0.5 - 20 Hz
= AC 0 - 20 A
output isolated, max DC 30 V/30 mA
output frequency limited to 30 Hz
output can be connected to the digital input of a PLC
incorporated reverse voltage protection diode
electrical connection via screwless pluggable ter-
minals
supply voltage DC 10...30 V
DIN-rail-mount or with screws
plug-in current transformer (Ø 11 mm)
Options: - currents up to 60 A
- other frequencies
AC-Electronic Current Tranducer STWA1FH
with frequency output
1 Housing
2 Clip for DIN-rail (removeable)
3 Terminal (pluggable)
4 Wall-mounting (M4)
STWA1FH
Electronic Current Trans-
former with current pro-
portional frequency output
0...20 A - 0,5...20 Hz
Dimension illustrations
The STWA1FH provides a fre-
quency output with 0.5...20 Hz
which corresponds to a current
ow of AC 0 - 20 A through
the trans former. Multiple loops
of the conductor through the
transformer reduce the current
range corres pondingly (e.g. with
fourfold looping-through 0 - 5 A
correspond to 0.5...20 Hz).
For the monitoring of high cur-
rents, the STWA1FH is simply
looped in the secondary circuit
of a large current transformer.
Consequently, the frequency out-
put is proportional to the primary
current of the transformer, e.g.
0 - 100 A for a transformer with
100/5 A (cable four times through
the STWA1F).
The oset of 0.5 Hz at the be-
ginning of the transducing range
is for tech nical reasons. During
evaluation, it can be taken into
account.
Power supply Us
Monitoring range
Output
Switching voltage
Switching current min/max
Adjustment time
Error (of scale, above 10%/
I
rated)
Temperature coecient
Nominal frequency/operating range
Error
Overload capacity cont./10 s
Testing voltage to supply voltage
max. ambient temperature
Housing
Dimensions (h x w x d)
Diameter for conductor
Weight
DC 10 - 30 V
AC 0...20 A
0,5...20 Hz
max. DC 30 V
DC 1 / 30 mA
< 0,5 s.
≤ 3%
< 0,06%/K
50 Hz/50...400 Hz
≤ 0,2%/Hz
In + 5% / 200 A
500 V
0...55°C
Design H
42 x 36 x 56 mm
11 mm
app. 90 g
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Electronic-Current-Transformer
Part number: S225560
