Release 7/2009 Ver. 1.0
Technical Manual: GS-120 Light Curtain Systems
TAPESWITCH CORPORATION
Phone: 631-630-0442
100 Schmitt Boulevard
28
Fax: 631-630-0454
Farmingdale, New York 11735
www.tapeswitch.com
Figure 28 – Emitter Connector
3.3.2.2 Test Input
On some machines, a test input is used to check the
interface between the photo-electric safety device and
the machine. The input simulates the obstruction of the
curtain in order to cycle the output switching elements
and thereby expose any fault before the next machine
cycle. This input is applied during a safe part of the
machine cycle or at the end of the cycle.
If this function is used, a normally closed contact should
be connected as shown in
Figure 29
.
This contact must open for a minimum of 100ms. When
this contact is opened, the light curtain safety outputs
will be switched off and will remain off until the test
contact closes again and the curtain self-tests have
been successfully performed (assuming that the curtain
is not obstructed).
If the test input is not used, this input must be
jumpered.
NOTE: If the emitter cable is removed during
normal operation, the system will not return to
normal operation once the emitter is reconnected
until power is cycled on the receiver.
Figure 29 – Emitter Connections
3.3.3
RECEIVER UNIT
3.3.3.1 General
The GS-120 is available with two output modes, PNP
and SSR, as shown in the order codes in section 1.3.
The PNP version has cross-monitored 24Vdc PNP
outputs, start/restart interlock and the ability to monitor
contacts from external devices (EDM). The SSR version
has volt-free contacts which are closed when the curtain
is clear, but does not have any start/restart interlock
function. This must be provided elsewhere in the safety
system. The receiver connector is shown in
Figure 30
.
The 24Vdc supply must have a 2A quick
blow in-line fuse fitted.
Figure 30 – Receiver Connector
Ground
