Rockwell Automation Publication 440R-UM012E-EN-P - November 2018 45
Example Operational Sequence Diagrams Chapter 9
3. You press the Start button and the motor begins to accelerate and the
proximity sensors generate pulses. At some point, the speed becomes
faster than the safely limited speed set by SLS1 on the GLP safety relay
but stays below the maximum safe speed. This speed is the normal
machine operating speed during production.
4. Later, you want to enter the cell. You press the Unlock Request button.
Upon release, the signal at Y32 goes to zero, which is a Stop signal for
the drive. The drive is configured to execute an orderly shutdown and
ramps the speed of the motor to zero. The pulses from the proximity
sensors reduce in frequency.
5. When the motor speed is slower than the configured Safely Limited
Speed, the GLP safety relay begins the Frequency Measurement Time to
verify that the motor speed remains below the SLS1 setting.
6. At the end of the frequency Measurement Time, the gate terminal 51
output turns ON to unlock the gate (the 51/L61 indicator turns OFF).
Simultaneously, the L11 signal stops oscillating. This action causes the
EM outputs to open which de-energizes K1and K2.
Now you can open the gate, enter the manufacturing cell, and perform
normal production operations as specified in your procedures.
You leave the cell and close the gate.
7. You press and release the Reset button. The lock command signal
(terminal 51) goes low to lock the gate. The GLP safety relay
interrogates S12 and S22. If the gate is locked, the GLP safety relay sets
Y32, X14 and X24 high, and L11 begins oscillating.
8. You press the Start button. The motor ramps up to production speed.
9. You press the Stop button. The motor decelerates to a stop. When the
speed drops below the safely limited speed, the GLP safety relay does
not change the door status.
10. You press the Start button. The motor ramps up to production speed.
11. The motor exceeds the maximum speed set by SLS2. The GLP safety
relay detects the speed by the proximity sensors and immediately turns
off Y32, X14 and X24, and L11 stops oscillating. The drive executes a
coast-to-stop. The safety gate remains locked. The PWR/Fault status
indicator is green with 4x flashing red to indicate overspeed.
IMPORTANT The motor can still be rotating slowly. The slowest rate must not
cause harm to the operator.
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