Rockwell Automation 1771-PM , D17716.5.18 U MNL 1771-PM CLUTCH/BRAKE MOD - Manual (Page 102)

Troubleshooting
Chapter 7
7Ć18
BRAKE OR MOTION DETECTOR MESSAGES (cont'd)
HEX
CODE
TYPE PROBLEM CORRECTIVE ACTION
077
078
L MOTION DETECTOR SIGNAL DISAPPEARANCE ON 2ND
DOWNSTROKE"
MOTION DETECTOR SIGNAL DISAPPEARANCE DURING
CONTINUOUS CYCLE"
Proper motion detection must be seen for press operation to
continue.
Check for proper cam configuration and operation (fig. 5.1).
Check for proper motion detector feedback signal.
*Requires stopping and existing continuous mode. Inch to
near top zone to start next single/continuous stroke.
079
07A
L MOTION DETECTOR SIGNAL DISAPPEARS AT NEAR
BOTTOM"
MOTION DETECTOR SIGNAL DISPAPPEARS AT NEAR TOP"
The motion detector signal must come on by the time the brake
monitor cam opens in the near bottom zone, and must remain on
to continue stroking. This message will also occur when the
press is in an upstroke and the motion detector signal
disappears.
Check for proper cam configuration and operation (fig. 5.1).
Check for proper motion detector feedback.
07B T MOTION DETECTOR SIGNAL COMES ON WHILE PRESS IS
STOPPED"
Check for a faulty motion detector or a shorted wire
condition. Check for proper clutch operation.
07C T MOTION DETECTOR SIGNAL REMAINS ON AFTER PRESS
STOPS"
The motion detector signal needs to drop out within 4 seconds
after clutch solenoid outputs are deĆenergized.
Check for a faulty motion detector or a shorted wire
condition. Check for proper clutch operation.
080
081
082
083
L BRAKE MONITOR AND RUNĆON CAM SWITCHES ARE BOTH
CLOSED"
BRAKE MONITOR FOR THIS CHASSIS AND RUNĆON CAM
FOR THE OTHER CHASSIS BOTH CLOSED"
BRAKE MONITOR FOR THE OTHER CHASSIS AND RUNĆON
CAM FOR THIS CHASSIS BOTH CLOSED"
ALT BRAKE MONITOR AND RUNĆON CAM SWITCHES ARE
BOTH CLOSED"
There should not be any overlap of the brake monitor and runĆon
cam switches at the near top position.
Check for proper cam configuration and operation (See fig.
5.1). Check for a faulty cam limit switch.