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Release 7/2009 Ver. 1.0
1.0
INTRODUCTION
Tapeswitch SRUS interface control units are designed
to be used with GS-120 Light curtains to form a
complete safety system. Full system installation
instructions are supplied with the light curtains.
2.0
PRODUCT DESCRIPTION
The SRUS interface unit operates from 24Vdc supply.
The unit is housed in a DIN rail mounting enclosure with
16 integral terminals. This unit is intended to be
mounted in an existing electrical enclosure on the
machine. This existing enclosure must be sealed to
minimum rating of IP54.
3.0
PRINCIPLE OF OPERATION
When power is first applied, relays K1 & K2 are de-
energized and there is no path through the safety
contacts 13-14 and 23-24. When the reset switch is
closed (Y1 - Y2 ) there will still be no path through the
safety contacts. When the reset switch is opened again
the path through the safety contacts is established.
If the light curtain is then obstructed, its outputs go off
and the safety contacts open. Even when the light
curtain is clear again the safety outputs remain open
until the reset is repeated.
The unit provides both a manual or auto reset function.
In manual reset mode, the reset function provides start
and restart interlock functions as follows:
START INTERLOCK - When power is applied to the
system, the output relays cannot be energized until
a reset signal has been applied.
RESTART INTERLOCK - Once the light curtain has
been obstructed and the output relays have de-
energized, they cannot be energized again until the
light curtain has been cleared and a reset signal has
been applied.
The start/restart interlock function must be incorporated
somewhere in the machine safety system. However, this
function may be provided by equipment other than the
light curtain, i.e., it may already be included in the
machine control circuit. In such a case, the light curtain
interface should function in an auto-reset mode.
In auto-reset mode the output relays will be energized
whenever power is applied to the system and the light
curtain is clear, and the output relays will re-energize
immediately after an interruption is cleared.
TAPESWITCH CORPORATION
100 Schmitt Boulevard
Farmingdale, New York 11735
APPENDIX D – SRUS INTERFACE UNIT
Technical Manual: GS-120 Light Curtain Systems
In manual or auto reset mode, reset will be prevented
while the light curtain is obstructed, if there is a fault in
the reset circuit or if the two output relays are in
disparity.
The safety output contacts of the control unit are
connected to the machine primary control element(s) in
such a way that if either of the safety output relays is de-
energized then the machine will be brought to rest
regardless of the state of the other relay.
NOTE: A machine primary control element or MPCE is
defined as 'an electrically controlled element which
directly controls the normal operating motion of a
machine such that it is the last (in time) to operate when
motion is initiated or arrested'.
In addition, where the machine control system has two
MPCEs, these devices can be monitored by connecting
normally closed auxiliary contacts from each MPCE in
series with the reset input. Disparity between the two
MPCEs will prevent a reset.
4.0
INSTALLATION
TAPESWITCH SAFETY SYSTEMS ARE DESIGNED TO
PROTECT OPERATORS
DANGEROUS MACHINES. THEY CAN ONLY PERFORM
THAT FUNCTION IF THEY ARE CORRECTLY FITTED AND
INTERFACED TO A SUITABLE MACHINE. EVERY EFFORT
HAS BEEN MADE TO PROVIDE COMPREHENSIVE AND
ACCURATE INFORMATION. IT IS THE RESPONSIBILITY
OF THE USER TO ENSURE THAT ALL PERSONS
INVOLVED IN THE INSTALLATION OF THE PRODUCT
HAVE THE KNOWLEDGE, TRAINING AND EXPERIENCE
NECESSARY AND THAT THEY ARE FULLY CONVERSANT
WITH ALL LAWS, RULES, REGULATIONS AND CODES OF
PRACTICE PERTAINING TO THEIR TASK.
4.1
MECHANICAL
4.1.1
GENERAL
The SRUS interface unit should be mounted in the
machine control unit on standard 'top hat' terminal rail
type DIN EN 50 022-35. The machine control unit must
provide sealing to IP54 according to IEC 529. The
dimensions of the SRUS interface unit are shown in
Figure 64.
Mechanical vibrations greater than 5g / 33Hz should be
avoided when in transportation and when in operation.
63
WARNING
WORKING AT OR
Phone: 631-630-0442
Fax: 631-630-0454
www.tapeswitch.com
NEAR
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