Allen-Bradley DriveGuard PowerFlex 700S User Manual page 19

Example 2
Safe-Off Connection with Controlled Stop Action, Dual Channel
Figure 3 Stop Category 1 – Controlled
GuardMaster
Trojan
Gate
+24V DC
A1 S21 S11 S52 S12 S22
Minotaur
MSR138DP
A2 X1 X2 X3 X4 Y39 Y40
+24V DC
Common
Circuit Status – Circuit shown with guard door closed and system ready
for normal operation.
Operating Principle – This is a dual channel system with monitoring of
the safe-off circuit and drive. Opening the guard door will switch the
input circuits (S11-S12 & S21-S22) to the Minotaur monitoring safety
relay unit. The immediate output circuits (13-14) will issue a Stop
command to the drive and cause a controlled deceleration. After the
programmed delay, the timed output circuits (47-48 & 57-58) will cause
the Safe-Off option and the drive Enable circuit to go to a safe state (off).
If the motor has not stopped rotating, it will coast to stop. To restart the
drive, the Minotaur safety relay inputs (S11-S12, S21-S22) must first be
ready for normal drive operation followed by a valid start command to
the drive.
Fault Detection – A single fault detected on the Minotaur safety input
circuits will result in the lock-out of the system to a safe state (off) at the
next operation and will not cause loss of the safety function.
If the Safe-Off option sticks ON, the motor will stop on command due to
the enable input. The system cannot be reset and thereby reveals the fault
condition to the operator.
37 47 57 13 23 S33
38 48 58 14 24 Y2
Description of Operation
PowerFlex 700S
+24V DC
Stop
Stop
Start
Start
Start/Stop Common
24V DC Common
S34
Safe Off Option
3
Y1
4
1
2
Common
Enable
AC Line
Input Power
AC Drive
Gate Control
Power Supply
Gate Control
Circuit
M
17