17
Function Descriptions
Automatic Safety Distance
The Presscam 8 can automatically compute a safety
distance required for light curtain installations. The
Safety Distance uses the 63in/sec hand speed constant
and includes 35msec for the light curtain response time,
control system response time (if you hook up the light
curtain output to the Presscam 8 through the AUX input)
and Depth Penetration factor (determined by the beam
spacing and set in Press Utility).
Auxiliary Input: You must hook up an isolated light
curtain contact to the AUX input found on the Presscam
8 Input/Output board. The AUX input requires a 24vdc
input (standard) or 120vac input (optional). D53 should
be lit when the curtain is GREEN (no blockage).
See Press Utility function on how to set the Dpf (Depth
Penetration Factor). The Dpf is determined from an
ANSI chart (see Regulations & Guidelines for Safe
Operation, “ANSI Standards B11.19-1990”). You must
fi rst determine the worst case object sensitivity of the
light curtain (this will be found in your light curtain
manual)
To perform the Safety Distance test to include control
system response time:
1) Select the 90° stop test.
2) Start the press and block the light curtain on the
way down (block from 30° to 80°).
To perform the Safety Distance test not including control
system response time:
1) Make sure nothing is attached to the AUX input
on the Presscam 8
2) Select the 90° stop test.
3) Start the press and don’t block the light curtain.
Time-Based Brake Monitor
The PressCam 8 is a time-based brake monitor as
opposed to a position-based brake monitor. It does not
know or care when the press comes to a stop but rather
how long it takes for the press to stop from the time the
brake/clutch signal is removed.
Monitoring the stop time allows you to determine a safety
distance for placing electronic guarding equipment and
to shut down the press should the press take longer to
stop than allowed for in your safety distance. Refer to
the Regulations & Guidelines for Safe Operation section
in this manual for the safety distance formula as well
as the manual that came with your electronic guarding
equipment.
The brake monitor function will automatically prevent
a successive stroke of the press if the stopping time
deteriorates beyond the brake FAIL set-point. The
keyswitch is the only way to clear this fault. A brake
warning (WARN) set-point is also provided as a
notifi cation before the press brake must be repaired.
The PressCam 8 stores only one WARN and FAIL set-
point set, therefore, you must set these for the worst
case situation (heaviest tool, fastest speed, and 90º
stop test).
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