Allen-Bradley ClutchBrake PLC-5 Series - Select the Type of Position Sensor; Rotary Cam Limit Switches; Resolver

2–3Define Your Control System Characteristics
Publication 65566.5.1 - October 1996
The control system uses dual independent position sensors to monitor
the slide position. You select the type of position sensor from:
• dual rotary cam limit switches (RCLS)
• dual resolvers (with RCLSs simulated in ladder logic)
• combination of both
Rotary Cam Limit Switches
These switches monitor the position of the slide by riding rotating
cams. The switches open or close according to the cam geometry that
you can adjust to represent the six rotational zones in the press cycle.
You must use two independent switch assemblies, one wired to
chassis A, the other to chassis B, with these limit switches:
• brake monitor (BCAM)
• takeover (TCAM)
• anti-repeat (ACAM)
Device Symbol Purpose Type
Antirepeat
(ACAM)
In Single Mode: Monitors press motion to limit operation to
a single stroke if operators hold RUN buttons too long.
1 N.O. contact
(2 switches per system)
Brake
Monitor
(BCAM)
In Single or Continuous Mode: Monitors the slide
position where the press comes to a stop. Designed to
prevent the press from starting if it stops too late
1 N.O. contact
(2 switches per system)
Takeover
(TCAM)
In Single Mode: Lets the press complete a stroke when
operators release run buttons after downstroke.
In Continuous Mode: Lets the press continue stroking.
Stops the press at the end of a stroke when commanded.
1 N.O. contact
(2 switches per system)
If using rotary cam limit switches, record the fact on the worksheet.
We assist you in setting up your rotary cam limit switches in chapter 7.
Resolver
Resolvers monitor the position of the press slide electronically, so are free
from contact failure. We recommend either group of resolver devices:
• AMCI Series 1700 resolver and interface module (for I/O chassis)
• NSD VRE-P062 resolver, VE-2A decoder, and 1771-IBD input module
When using resolvers, you must simulate the action of cam limit
switches with ladder logic. We assist you in doing this in chapter 7.
We reserved slots 0 and 1 of I/O chassis A and B for resolver input
modules. This slot location helps you isolate ac and dc input signals.
If using resolvers, record the brand and model on the worksheet.
4. Select the Type of
Position Sensor