Banner DUO-TOUCH Run Bar with STB Buttons - Manual (Page 5)

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 may result in
serious injury or death.
Two-Hand Control Separation (Safety) Distance
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” (“safety
distance”), and may be calculated as follows. The formulas differ slightly between U.S. and EU-Certified installations, but
the concepts are similar.
Formulas for U.S. Installations
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 following 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 × (T
m
+ T
r
+ T
h
)
Formula for EU-Certified Installations
The formula used to calculate the minimum
safety distance (S) from the nearest actuator
to the danger zone is:
S = (K × T) + C
In all cases, where:
D
s
= the separation (safety) distance in inches
S = the minimum safety distance in millimeters
K = OSHA/ANSI and ISO 13855 hand speed constant of 1600mm/s (63" per second) (NOTE 1 below)
T = the overall stop time of the machine, measured from the actuation of the sensing function to the final ceasing of all
motion.
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 Module as measured from the time either hand disengages a hand
control.
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) × T
cy
where:
N = number of clutch engaging points per revolution
T
cy
= time (in seconds) necessary to complete one revolution of the crankshaft
C = the added distance due to depth penetration factor: 250 mm, per ISO 13855. The ISO 13855 “C” factor can be
reduced to 0 if the risk of encroachment is eliminated, but the safety distance must always be 100 mm or greater.
NOTES:
1. The hand-speed constant (K) has been determined by various studies, and although these studies indicate speeds
of 1600 mm/s (63”/second), 2000 mm/s (79”/second), to more than 2540 mm/s (100”/second), they are not
conclusive determinations. The employer should consider all factors, including the physical ability of the operator,
when determining the value of K to be used.
2. T
s
is usually measured by a stop-time measuring device. If the specified machine stop time is 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
h
is usually insignificant for purely mechanical switches. However, Th should be considered for safety distance
calculation when using electronic or electromechanical (i.e. powered) hand controls. For Banner Self-checking
Touch Buttons (STBs), response time = 0.02 seconds.
DUO-TOUCH Run Bar with STB Buttons
Datasheet 131634_web Rev.
E
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