. . . . .
R
I
N T R O D U C T I O N
What A Safety Mat Does
SCIENTIFIC TECHNOLOGIES INC.
Call: 1/888/510-4357 in USA and Canada
Universal Safety Mat UM Series Rev. C
© STI 08/2000
3
• All brakes and stopping mechanisms must be inspected regularly to ensure proper working order. If
the stopping mechanisms are not working properly, the machine may not stop safely even though the
presence sensing mat and controller are functioning properly.
• The STI Test Procedure must be performed at installation and after any maintenance, modification or
adjustment is performed on the machine controls or on the presence sensing mat and controller. The
Test Procedure is presented in this manual.
• Do not perform any test or repairs other than those outlined in this manual. All electrical wiring must
be installed in accordance with local electrical codes and regulations.
• The user must follow all procedures in this manual for proper operation of the MC3 controller.
The enforcement of these requirements is beyond STI’s control. The employer has the sole
responsibility to follow the preceding requirements and any procedures, conditions and
requirements specific to your machinery
2 I
NTRODUCTION
2
Warning!
Read and understand this manual prior to installing the safety mat.
2 . 1 . W
H A T
A S
A F E T Y
M
A T
D
O E S
STI Universal safety mats provide personnel safeguards around hazardous machinery.
The Universal safety mat monitors ingress to the covered hazardous area and allows unimpeded
access for machinery, handling equipment and operators.
2 . 2 . T
H E O R Y
O F
O
P E R A T I O N
Multiple safety mats may be wired in series to form a complete floor-level guarding system. Each 4-
wire Universal safety mat operates on a low-power DC, or AC signal (depending on controller). A
signal is transmitted through the upper and lower plates separately via the two wires connected to
each plate. The signals through the Universal safety mats are monitored by the mat Controller.
When the Universal safety mat is not exposed to sufficient actuating force, the signals are
unimpaired. The output relays in the controller are energized permitting the guarded machine to
run.
When sufficient pressure is applied to the active mat area, the conductive plates touch causing the
output relays in the controller to de-energize and a stop signal is issued to the machine.
If a wire should break, separate from a plate, or become disconnected from the controller the output
relays in the controller will de-energize and a stop signal will be sent. Should the Universal safety
mat be punctured, the plates will short together in a similar manner as being stepped on guarded
machine. The controller will not restart until the punctured mat is replaced.
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