32 Rockwell Automation Publication 750-UM002H-EN-P - February 2017
Chapter 3 Safe Torque Off Option Module Operation
Figure 7 - Stop Category 0
Table 8 - Guardmaster Configurable Relay Example Summary
SP+
SP–
Sd
SE+
SE–
Sd
24V DC
0V DC COM
Gray
Pink
1 2 3 4 5 6 7 8 9 10 11
DC+
24V
COM
0V
PWR
RUN
FAULT
LOCK
COM
12 13 14 15 16 17 18 19 20 21
24V DC
A1 A2 A3 A4 A5 A6
B1 B2 B3 B4 B5 B6
AC Line
Input Power
Motor
24V DC COM
START
STOP
PowerFlex 750-Series
Drive
Gate Control
Jumpers:
ENABLE Installed
SAFETY Removed
START/STOP COM
SensaGuard
Interlock Switch
Micro800®
2080-IQ40B4 Plug-in I/O
Guardmaster 440C-CR30
Configurable
Safety Relay
Initiate Reset to
440C-CR30 Safety Relay via PAC
Reset
Attribute Description
Circuit status
Circuit is shown with guard door closed and system ready for normal drive
operation.
Operating principle
This is a dual-channel system with monitoring of the Safe Torque Off circuit and
drive. Monitoring is software configurable by using Connected Components
Workbench software. Opening the guard door switches the input circuits (1 and 2)
to the Guardmaster monitoring safety relay. The output circuits (19, 20, and 21)
cause the drive Enable circuit to trip and the motor coast to stop. To restart the
drive, the Guardmaster safety relay must first be reset followed by a valid start
command to the drive.
Application Considerations
When the hazard analysis for the overall machine determines the need for external
mechanical brakes or other stopping means, the external means shall be activated
after the removal of power for Stop Category 0.
If the safety option module sticks ON, the motor stops on command due to the
enable input. The system cannot be reset when this fault condition exists.
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