Section 4
Operation
20412948
8-2012/Rev 04
4-9
STROKE RATE ALLOWED increases or decreases the allowed stroke rate; press the ▲ or ▼
arrow to select the rate. Stroke rate should be set slightly higher than the desired
operating rate to shutdown the machine quickly in the event of an overstroke condition.
Figure 4-11: Stroke Rate Screen - Redundant
The upper limit points displayed on the Stroke Rate Screen are preset according to the
horsepower rating of the machine. Table 4-2, Overstroke Set Points, illustrates the upper limits
for the complete SL-V series. It also shows the number of strokes per minute above the setting
that will result in a warning or shutdown condition.
Before setting the stroke rate you can monitor the graph to assess the actual stroke rate during
normal operation. The stroke rate allowed should then be set 20% above that rate.
Table 4-2
Overstroke Set Points
Horsepower
Maximum Limit
Strokes Per Minute Added to
Stroke Rate Allowed
55,000 psi 60,000 psi Warning Shutdown
30 37 34 2 4
50 60 55 2 4
60 75 71 3 6
100 79 75 3 6
Example
You are operating a 50 horsepower machine and the allowable stroke
rate is set at 40 strokes per minute. If the stroke rate reaches 42, an
overstroke warning will be issued after 15 seconds. The warning will
continue until the rate returns to normal, or exceeds the overstroke
shutdown point.
If the stroke rate reaches 44 an overstroke shutdown pending will be
issued. If the condition exists for 30 seconds, an automatic shutdown
will occur.
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