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Chapter 3
Clutch/Brake Controller Hardware
Module Placement
3 12
The number of degrees that the shaft continues to rotate, beyond the
moment in time when the input changes, depends on the speed of rotation.
The greater the number of strokes per minute (SPM), the further the shaft
rotates before a command from the clutch/brake controller is applied. The
response time of 44ms is represented in degrees of shaft rotation that
increases as the rate of press operation increases (Figure 3.5).
Figure 3.5
Response Time of Clutch Brake Controller
SPM
100
90
80
70
60
50
40
30
20
10
0
0
5
10
Degrees of Shaft Rotation
Important: When estimating the braking distance in degrees of rotation,
add the response time of the controller (Figure 3.5) to the specified
downstroke or upstroke braking distance of your press.
Locations of all clutch/brake controller modules are shown in Figure 3.6.
Note that some of these modules are optional.
CAUTION: Do not place any I/O module in module groups
6 or 7 of chassis A or B. These module group locations are
non-functional and reserved for future use. If you use a slot
power supply, install it in module group 7.
Important: Use series C or later 1771-OD modules because they have
improved electrical noise immunity. Refer to Electrical Noise
Suppression, in chapter 6, for a method of suppressing surge transient
noise.
15
20
25
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Table of Contents
Troubleshooting
