Brake Performance Tester or Stop Time Meter
The Semelex II Safetimeter Checks Stop Time,
Safety Distance and More...
Stop time (Ts) is the time interval from the initiation of the stop signal to the complete stop
of the press. Stop time can change as a result of wear, speed, machine use, solenoid valve
response, die weight, and other factors. State and Federal guidelines require periodic checking
of stop time.
Safety Distance (Ds) is the distance between the location of two-hand control or personnel safety
devices and the pinch point closest to the operator. OSHA regulation 1910.217(c)(3)(iii)(e)
expresses Safety Distance using the following formula:
Ds = Ts x 63 inches/sec
When selected, the Semelex II Safetimeter will display the minimum safety
distance per the OSHA formula.
Counterbalance can be easily checked by measuring the down- and up-stroke stop time. When these
two times are the same, counter-balance is properly set.
Personnel Safety Devices like light curtains or safety mats can be tested using the Auto-Hand and
Auto-Flag to verify reaction time per the OSHA formula. The overall response time of the
safety device, press control E-Stop circuit, and the clutch brake mechanism are checked when
the Auto-Hand or Auto-Flag accessories are used.