2
Operating instructions
Pull-wire switches
TQ 900
EN
2. Product description
2.1 Ordering code
This operating instructions manual applies to the following types:
TQ 900-
➀
No.
Option
Description
➀
11
1 NO contacts / 1 NC contacts
13
1 NO contacts / 3 NC contacts
22
2 NO contacts / 2 NC contacts
02
2 NC contacts
04
4 NC
2.2 Special versions
For special versions, which are not listed in the order code below 2.1,
these specifications apply accordingly, provided that they correspond to
the standard version.
2.3 Destination and use
Pull-wire switches are used on machinery and plants, where triggering
the switching command must be enabled at arbitrary points on the wire
run. If the tensioned pull-wire is pulled or in case of wire breakage, the
switching function of the pull-wire switch is activated. (refer to image 1).
F
1
0
0
Image 1: position indication and actuation
Design/operating principle
The pull-wire switches of the TQ 900 series are brought into the
operational condition by the proper pre-tensioning of the wire. Up to two
switching elements located on the inside of the switch have either 2 or
4 contacts, whereby the NC contacts are closed and the NO contacts
are opened in tensioned condition.
The pull-wire switch does not meet the requirements of ISO 13850,
IEC 60947-5-5 and NBR 13930.
2.4 Technical data
Standards:
IEC 60947-5-1
Enclosure:
GD-Zn alloy, paint
Cover:
thermoplastic
Protection class:
IP65, IP67 to IEC 60529
Contact material:
Silver
Switching system:
Change-over contact with double break,
1 to 4 NC contacts; slow action with
positive break NC contacts
A
Connection:
screw terminals
Cable section:
max. 2.5 mm² (incl. conductor ferrules)
Cable entry:
3 x M20 x 1.5
Rated impulse withstand voltage U
imp
:
6 kV
Rated insulation voltage U
i
:
500 V
Thermal test current I
the
:
6 A
Rated operating current/voltage I
e
/U
e
:
4 A / 230 VAC,
1 A / 24 VDC
Utilisation category:
AC-15, DC-13
Required short-circuit current:
1000 A
Max. fuse rating:
6 A gG D-fuse (EN 60269-1)
Ambient temperature:
–25 °C … +70 °C
Wire length:
max. 75 m depending in relation to the
range of ambient temperature (see image 3)
Mechanical life:
>1 million operations
AWG 14. Solid/Stranded. Max. torque: 7 in. lb.
Use copper conductors only.
3. Mounting
3.1 General mounting instructions
The fitting may only be carried out by authorised personnel. The pull-
wire switch is fitted by means of two screws (distance of the drill holes
40 mm or 48 mm).
For tensioned span lengths up to 10 m, intermediate wire supports are
required every 3 to 5 m. To avoid resonance vibrations in the wire on
machines with high vibrations, it is recommended to realise the individu-
al support length differently.
The maximum perpendicular traction force to be exercised
on the wire in order to activate the emergency pull-wire
switch is 200 N, the maximum deflection is 400 mm.
Sufficient space must be provided so that the required
actuating deflection can be reached.
6 4
2
3
6
5
6
1
0,1 m
3-5 m
A
4 6
9
3
2
max. 75 m
8
2
3
8
3
2
7
0,1 m
3-5 m
A
1
9
Image 2: mounting of the components
Key
1
Pull-wire with red PVC sheath Ø 5 mm (steel core: Ø 3 mm)
2 Eyebolt
3 Nut
4
Wire clamp
5 Tensioner
6
Wire thimble
7 shackle
8
S900 wire tensioner
9
Tension spring RZ-2041
A
position indication
We recommend the use of the RZ-2041 tension spring to attenuate the
effects of temperature variations.
Due to the thermal expansion behaviour of the wire, the maximum
authorised wire length is determined by the ambient temperature range
(refer to image 3).
-10
-20
-30
5
15
25
35
45
55
65
75
0
10
20 30 40 50 60 70
l m
[ ]
T °C
[ ]
■
without tension
spring
■
with tension
spring
Image 3: temperature-dependent maximum wire length with or without
tension spring
