Electrical Installation - Banner DUO-TOUCH SG Manual

Example Separation Distance (D
The following example illustrates the use of the formula to calculate separation distance for a part-revolution clutch machine. This
example uses 0.50 seconds as a typical value for T
K = 63" per second
T = 0.50 seconds (measured by a stop-time measuring device)
s
T = 0.035 seconds
r
T = 0.02 seconds
h
D = K x (T + T + T
s s r
= 63" (0.50 + 0.035 + 0.02)
= 35"
In this example, both hand controls must be located no closer than 36" from the nearest hazard point.
NOTE:
1. The OSHA-recommended hand speed constant K has been determined by various studies, and
although these studies indicate speeds of 63"/sec to over 100"/sec, they are not conclusive deter-
minations. The employer should consider all factors, including the physical ability of the operator,
when determining the value of K to be used.
2. T is usually measured by a stop-time measuring device. If the specified machine stop time is
s
used, add at least 20% as a safety factor to account for brake system deterioration. If the stop-time
of the two redundant machine control elements is unequal, the slower of the two times must be
used for calculating the separation distance.
3. T is usually insignificant for purely mechanical switches. However, T
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separation distance calculation when using electronic or electromechanical (i.e. powered) hand
controls. In this example, STB response time = 0.02 seconds.

Electrical Installation

Because the DUO-TOUCH SG Safety Module interfaces to many types of machine controls, it is not possible to give exact wiring instruc-
tions here. The following guidelines are general in nature.
CAUTION: Disconnect Power Before Wiring
Before making any wire connections, make certain all power is disconnected from the Safety Mod-
ule and the machine to be controlled.
Electrical installation of hand controls, the DUO-TOUCH SG Safety Module, and the interconnection to the
machine control must be made by qualified personnel and must comply with NEC (National Electrical
Code), ANSI/NFPA79 or IEC60204-1, and all applicable local standards.
Dangerous voltages may be present along the Safety Module wiring barriers whenever power to the ma-
chine control elements is ON. Exercise extreme caution whenever machine control power is or may
be present. Always disconnect power to the machine control elements before opening the enclo-
sure housing of the Safety Module.
10
) Calculation
s
and 0.02 seconds for T
s
)
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www.bannerengineering.com - tel: 763-544-3164
DUO-TOUCH® SG Two-Hand Control Modules
:
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should be considered for
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P/N 109782 Rev.B