Separation Distance
WARNING: Location of Touch Button Controls
Hand controls must be mounted a safe distance from moving machine parts, as determined by the
appropriate standard. It must not be possible for the operator or other non-qualified persons to relocate
them. Failure to establish and maintain the required safety distance could result in serious injury or
death.
Both hand controls must be located far enough away from the nearest hazard point that the operator cannot reach the hazard with a hand
or other body part before the hazardous motion ceases. This is the “separation distance,” and may be calculated as follows:
For Part-Revolution Clutch Machinery
Where the machine and its controls allow the machine to stop motion during the hazardous portion of the machine cycle, use the follow-
ing formula: D
s
= K x (T
s
+ T
r
+ T
h
)
For Full-Revolution Clutch Machinery
Where the machine and its controls are designed to complete a full machine cycle, once activated, use the following formula:
D
s
= K x (T
m
+ T
r
+ T
h
)
For both formulas:
D
s
=
the separation distance in inches
K
=
63" per second (the hand speed constant currently accepted by OSHA; see NOTE 1)
T
s
=
the stop time (in seconds) of the machine, measured from the application of the “stop” signal to the final ceasing of all
motion, including stop times of all relevant control elements, and measured at maximum machine velocity (see NOTE 2)
T
r
=
0.035 seconds (the response time of the Safety Module as measured from the time a stop is signalled by either hand con-
trol)
T
h
=
the response time of the slowest hand control (from the time when a hand disengages that control until the switch opens;
see NOTE 3)
T
m
=
the maximum time (in seconds) the machine takes to cease all motion after it has been tripped. For full-revolution clutch
presses with only one engaging point, T
m
is equal to the time necessary for one and one-half revolutions of the crankshaft.
For full-revolution clutch presses with more than one engaging point, T
m
is calculated as follows:
T
m
= (
1/2
+
1/N
) x T
cy
where:
N = number of clutch engaging points per revolution
T
cy
= time (in seconds) necessary to complete one revolution of the crankshaft
DUO-TOUCH
®
SG Two-Hand Control Modules
P/N 109782 Rev.B
www.bannerengineering.com - tel: 763-544-3164
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