ZIEHL STW81V, Operating Manual

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STW81V 12380-0710-00 Page 6 / 8 www.ziehl.de
10 Connections
10.1 Connections
Connection Function
A1 and A2 Control voltage Us, see technical data
15 Common switching contact for slider outputs

(GND)
Current transducer common earth connection STWA1(H)
I1 … I8 Inputs for STWA1(H), potential free contacts or current sensor S1
+U
Common supply voltage for potential free contacts or S1 current
sensor
16, 26, … 86 8 outputs for closed gate
18, 28, … 88 8 outputs for open slider
95, 96, 98 Exhaust performance (95-98 = exhaust on)
10.2 Tipps:
Response threshold is too high (current flow in the wire is too low):

reduce the response threshold by potentiometer

if the smallest setting option is insufficient, loop the lines through the current transducer
STWA1(H) several times.
Response threshold is too low (base load current must be extinguished):

increase the response threshold by potentiometer

connect a resistor (0.25 W / 200 V) before the corresponding input of STW81V in parallel to the
current transducer STWA1(H).

750 Ω resistor = increase by a factor 2

330 Ω resistor = increase by a factor 4

Due to large tolerances that must be considered, we recommend that the best values be
determined by trial and error method.
Length of connecting cables STWA1(H):
Up to 50 m, but much longer are also possible.
Shielding may be required when laid parallel to power lines.
11 Troubleshooting
Problem Cause Remedy
Relay does not switch
Supply voltage is not
connected to terminals
A1, A2
Check that the power supply voltage is
connected and that it corresponds to the
voltage of the unit indicated on the side
nameplate.
No current through current
transducer
Check that the current transducer is
properly connected and that the receiver is
turned on
More than 1 conductive wire
routed through the
transducer
Run only one current-carrying wire through
the transducer.
Relay does not turn on Check the switching threshold on
potentiometer I1-I8.
Relay does not switch at
potential-free contacts Incorrectly connected
contacts Potential-free contacts must be
connected to +U