Tapeswitch GS-120 Technical Manual page 64

Release 7/2009 Ver. 1.0
Figure 64 – Dimensions
4.1.2 RESET INPUT DEVICE
A normally open switch, preferably a 22 mm industrial
pushbutton, should be used to provide the reset input.
The switch should be housed in a suitable enclosure
and should be mounted in such a position that it is safe
from passing traffic and such that the person operating
the switch can see all of the dangerous area.
4.2 ELECTRICAL
4.2.1 GENERAL
The connections for the SRUS interface unit are shown
in Figure 67. Crimped ferrules should be fitted on all
stranded wires. The exact cabling requirements are at
the discretion of the installer and depend to a large
extent on the siting of the various control system
elements. In general, it is recommended that high
voltage cables are routed away from low voltage cables.
4.2.2 LIGHT CURTAIN CONNECTION
Connect the fail-safe PNP inputs from the GS-120 light
curtain terminals 4 & 5 (cable colors yellow & grey) to
terminals S12 & S22, as shown in Figure 67.
4.2.3 POWER CONNECTION
Connect +24Vdc to terminal A1 (+) & connect 0V to
terminal A2 (-) as shown in Figure 67. The power
consumption is approximately 2.5VA.
4.2.4 RESET INPUT CONNECTION
If the machine has two MPCEs, a pair of normally
closed auxiliary contacts from each MPCE can be
connected in series as follows: For manual reset
connect across terminals Y1 & Y2 see Figure 65. For
Auto Reset connect across terminals Y1 & Y2 see
Figure 66. This provides cross-monitoring of the
MPCEs such that if they are in disparity due to a fault,
reset will be prevented until the fault is rectified.
If there is no external monitoring, fit a link across the
terminals.
TAPESWITCH CORPORATION
100 Schmitt Boulevard
Farmingdale, New York 11735
Technical Manual: GS-120 Light Curtain Systems
4.2.5 SAFETY OUTPUT CONNECTION
Two normally open safety outputs are provided. In low
to medium risk applications the machine is normally
provided with a single MPCE. In such cases both safety
outputs should be connected in series with the MPCE
coil as shown in Figure 68. If the machine is fitted with
two MPCEs one safety output should be connected in
series with each MPCE coil as shown in Figure 69.
To protect the contacts of the safety output relays from
the effects of switching inductive loads, it is
recommended that arc suppressors should be fitted in
parallel with the MPCE coils as shown Figures 68 and
69. Arc suppressors must not be fitted across the safety
relay contacts.
To protect against the possibility of both safety outputs
welding in, due to an overcurrent fault in the machine
circuit, 6A quick blow, or 4A slow blow fuses should be
fitted in series with the MPCE coils as shown in Figures
68 and 69. This limits the current through the safety
output contacts to well below that which could cause the
contacts to weld.
4.2.6 MONITOR OUTPUT
If auxiliary signal contacts are required, the normally
open contacts across terminals 33 & 34 can be used.
NOTE: All outputs of the SRUS are safety outputs
and can be used in the machine stop circuit.
Figure 65 - Cross-monitoring of MPCEs - Manual Reset
Figure 66 - Cross-monitoring of MPCEs –Auto Reset
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