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SSC-1500 Part Revolution Solid-State Control
SECTION 3—INSTALLATION OF COMPONENTS
3.
According to ANSI B11.1 - 1988, the total stopping time of the press (for two-hand control) should include the total response time of the control
system and the time it takes the press to cease slide motion. The following formula should be used when calculating the safety distance:
Ds = K (Ts + Tc + Tbm); where:
K
= the hand speed constant = 63 inches/second.
Ts = stop time of the press measured from the final
deenergized control element, usually the air valve.
Tc = the response time of the control.
Note: Ts + Tc are usually measured by a portable or built-in
stop-time measuring device.
Tbm = the additional time allowed by the brake monitor (brake
performance monitor) before it detects stop-time deterioration.
When the press stroke STOP command or stopping performance monitor (brake monitor) timer or angle setting is changed, because the machine is taking
longer to stop, the safety distance should be recalculated. The safeguarding device should also be placed at a greater safety distance if the stopping time
or distance has increased.
Note: When obtaining the stopping time using the ANSI formulas, a stopping position of crankshaft rotation is not provided. (The OSHA formula uses
90°.) To calculate the safety distance, the stop signal should be given on the downstroke at a point that would provide the longest stopping time.
When applying the two run palm buttons to meet the requirements for a point-of-operation safeguarding
device, make certain these buttons are located on the machine so they meet the minimum safety distance
required by the OSHA or ANSI formulas.
Simply stated, safety distance is the mounting location of the palm buttons at a distance where the operator
cannot reach into the point-of-operation hazard before the ram has stopped or completed its downward travel.
To obtain the stopping time at 90° position of crankshaft rotation, either the built-in system (provided with the
control system) or portable stop-time measurement unit can be used.
WHEN USING
FOOT SINGLE STROKE
,
TWO-HAND “WALK-AWAY” CONTINUOUS
,
AUTOMATIC SINGLE STROKE
,
CONTINUOUS-ON-DEMAND
,
TWO-HAND- OR FOOT-MAINTAINED CONTINUOUS
, AND
ONE-HAND OR FOOT TRIP
MODES OF OPERATION:
A method of safeguarding the point of operation must be provided before using any of the above modes of operation.
The machine will not operate or must not be operated until you either:
1.
Electrically interlock or
2.
Mechanically safeguard the machine’s point of operation with a guard or device.
Install either the electrically interlocked method of safeguarding or the mechanical guard or device.
1.
When an electrically interlocked method of safeguarding the point of operation is chosen, connect the interlock to the
safeguard interlock
terminals (P8-17 and P8-18) in the control box, and as shown on the control wiring schematic (wire numbers 86 and 87). If a light curtain
is used as the point-of-operation safeguard, it does not need to be interlocked in to P8-17 and P8-18. Refer to the control wiring schematic
for proper terminal connection.
2.
When a mechanical guard or device (nonelectrically interlocked) is chosen, the safeguard interlock terminals (P8-17 and P8-18) are not
used. In order for the machine to operate with the use of a mechanical guard or device, the safeguard interlock terminals must be connected.
Note: When the mechanical guard or device is removed for other modes of operation, the safeguard interlock terminals must be disconnected.
(Continued on next page.)
