ZIEHL STW1K User manual

ZIEHL industrie – elektronik GmbH + Co KG
Daimlerstr.13, 74523 Schwäbisch Hall, Germany
+ 49 791 504-0, [e-mail], www.ziehl.de
Temperature Relays and MINIKA®
Mains Monitoring
Digital
Panelmeters MINIPAN®
Switching Relays and Controls
Measuring Transducers
Grid
-
and Plant Protection
Operating Manual
STW1K
updated: 2022-07-13/Um
For more information and help about this product please scan the QR-Code or
choose the following link: STW1K
Operating manual, Quick guide, Datasheet, Connection diagram, CAD Data
Firmwareupdates, FAQ, Videos about installation and settings, Certificates
STW1K 10630-0710-00 page 1 / 6 www.ziehl.de
- AC Current Sensing Relay, OR circuit 1-8 of transducers

STW1K 10630-0710-00 page 2 / 6 www.ziehl.de
Table of contents
1General Notes......................................................................................................................................... 2
2Application and short description......................................................................................................... 3
3Functional overview............................................................................................................................... 3
4Wiring scheme........................................................................................................................................ 3
5Important notes ...................................................................................................................................... 3
6Detailed description ............................................................................................................................... 4
7Assembly ................................................................................................................................................ 4
8Start-up ................................................................................................................................................... 4
9Trouble – shooting and remedies.......................................................................................................... 5
10 Technical data ........................................................................................................................................ 5
11 Design K.................................................................................................................................................. 6
12 Disposal .................................................................................................................................................. 6
1 General Notes
Compliance with the following instructions is mandatory to ensure the functionality and safety of the product.
If the following instructions given especially but not limited for general safety, transport, storage, mounting,
operating conditions, commissioning and disposal / recycling are not observed, the product may not operate
safely and may cause a hazard to the life and limb of users and third parties.
Deviations from the following requirements may therefore lead both to the loss of the statutory material defect
liability rights and to the liability of the buyer for the product that has become unsafe due to the deviation from
the specifications.

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2 Application and short description
STW1K current relay is an automatic starting device in OR circuit with 8 inputs. If a current > 1 A flows
through at least one connected transducer, the integrated relay (1co) is activated. If the currents through all
transformers are 0, the relay switches off with a delay of about 10 s to allow for the necessary timeout, e.g. for
a central extraction system in wood processing.
3 Functional overview
8 inputs in OR circuit
relay on when 1 input is activated
response threshold approx. 1 A
connection of current sensor S1 (power supply for S1 required)
switch-off delay approx. 10 s
Inputs that are not required remain open
4 Wiring scheme
5 Important notes
DANGER!
Hazardous voltage!
Will cause death or serious injury. Turn off and lock out all power
supplying this device before working on this device.
Attention!
Before switching on make sure that the operational voltage Us of the
type- plate and the mains voltage are the same.

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6 Detailed description
The STW1K current relay operates in an OR circuit and detects whether or not current is flowing in one of up
to 8 monitored wires. The relay is activated when the current flowing through the current transducer exceeds
a value of approximately 1 A. The output is a potential-free switching contact. It can be used to turn on
additional equipment such as extraction or blowing systems. If this value falls below approx. 0.5 A, the relay
switches off the auxiliary equipment again (after the switch-off delay time has elapsed). The STWA1(H)
current transformer can be loaded with a maximum current of 100 A.
Tips:
Response threshold is too high (current flow in the wire is too low):
wires pass through the current transformer STWA1(H) several times.
Response threshold is too low (base load current must be extinguished):
connect a resistor (0.25 W / 200 V) to the corresponding input of STW, in parallel to the current
transformer STWA1(H).
 750 Ω resistor = increase by a factor 2
 330 Ω resistor = increase by a factor 4
 120 Ω resistor = increase by a factor 10
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, also much longer are also possible.
Shielding may be required when laid parallel to power lines.
7 Assembly
The unit can be mounted as follows:
mounting of the on a 35 mm mounting rail according to EN 60715
optional: M4 screw fitting, only with additional bolt (not included)
Make the connection in accordance with the wiring diagram or the nameplate
When installing the device into the switchgear cabinet, please observe the max.
admissible temperature. Care for both, sufficient clearance to other devices and
sources of heat or enough forced draught. If cooling is made more difficult, e.g. close
devices with increased surface temperature or by handicap of airflow cooling, the
permissible ambient temperature has to be reduced.
8 Start-up
Attention!
Only 1 live conductor may be fed through the current transformer!
switch on the mains voltage
 when the device is ready for operation, the relay must switch on when a current ≥ approx.
1 A flows through the current transformer.

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9 Trouble – shooting and remedies
Relay does not turn on:
check that the control voltage at terminals A1, A2 is correctly applied and corresponds to the
device voltage specified on the device's rating plate.
check that the current transformer is properly connected. The consumer must be turned on.
Verify that only one conductor is routed through the transmitter.
10 Technical data
Control voltage Us: Refer to the unit rating plate
Tolerance DC 21 - 30 V AC -15 - +10%; 50/60 Hz
Power consumption < 1.5 W < 2 VA
Relay outputs K1, K2 (Alarm 1, 2) 1 switching contact
Switching voltage max AC 415 V
Conventional thermal current Ith max 6A
Switching capacity max AC cos φ = 1 2000 VA (resistive load) 120W at 24 V
DC
Electrical contact life cos φ = 1 1 x 10 5switching cycles at 240 V / 6 A
Durability of mechanical contact 3 x 107 switching cycles
Short circuit resistance (NO)
Short circuit resistance (NC) 4 A slow action or LS switch B4 3.15 A slow action
Shutdown capability
Category AC-15 Ie = 3 A Ue = 250 V
Rated operational current
Rated operational voltage DC-13 Ie = 2 A Ue = 24 V
Reduction factor for cos φ = 0.3
0.5
Transformer connection
Connection transformers 1 … 8 pcs Type STWA1 or STWA1H
Alternating current - internal resistance approx. 7kΩ
Transformer overload capacity max 100A continuous, max 300 A for 10 s
Switching points
Switching value app. AC 1 A
Activation delay < 200 ms
Switch-off delay See nameplate (without < 200 ms)
Testing conditions EN 61010-1
Rated withstand voltage 4000V
Overvoltage category III
Degree of contamination 2
Rated insulation voltage Ui 250V
On
-
time
100%
EMC tests EN 61326-1
Interference emission EN 61326-1; CISPR 11 Class B
Interference immunity EN 61326-1 (industrial environment)

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Environmental conditions
Permissible ambient temperature -20 °C ... +55°C
Permissible storage temperature -20 °C …+70 °C
Installation altitude < 2000 m a.s.l.
Resistance to climatic conditions 5- 85% relative humidity, non-condensing
Permissible wiring temperature -5 °C …+70 °C
Vibration resistance EN 60068-2-6 2…25 Hz ±1.6 mm 25 ... 150 Hz 5 g
Housing design K
Dimensions (W x H x L) 75 x 22.5 x 115 mm
Width 1 TE
Cable connection single wire / fine wire 1 x 0.5 mm 2– 2.5 mm² 2/ AWG 22 - 14
Fine wire with conductor ferrule 1 x 0.14 mm2– 2.5 mm² 2/ AWG 28 - 16
Strip length / tightening torque 8 mm / 0.5 Nm
Protection snaps IP40 / IP 20
Fastening Snap-on mounting on 35 mm mounting rail according
to EN 60715 or screw fixing M 4
Mounting position any
Weight
approx. 150 kg.
Subject to technical changes
11 Design K
Dimensions in mm
12 Disposal
Disposal should be carried out properly and in an environmentally friendly manner in
accordance with legal provisions.
ZIEHL is registered with the EAR Foundation under WEEE no .: DE 49 698 543.
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1 … Unterteil
2 … Deckel
3 … Riegel
4 … Schraube
5 ... Maß für Schraubenbefestigung
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