Safe – Rockwell Automation 21G PowerFlex 750-Series AC Drives Reference Manual User Manual

Page 86

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86

Rockwell Automation Publication 750-RM001F-EN-P - February 2012

Chapter 7

Safe Limited Speed (SLS) Modes

Safe Limited Speed with
Door Monitoring and
Enabling Switch Monitoring
Mode

When properly configured for Safe Limited Speed with Door Monitoring and
Enabling Switch Monitoring, the safety option performs Safe Limited Speed
(SLS) monitoring functions as described on

page 75

, in addition to the Safe Stop

functions as described in

Safe Stop Mode

on

page 61

.

The safety option also monitors both the Enabling Switch Monitor input
(ESM_In) and the Door Monitor input (DM_In). This mode lets you access the
hazardous area when the machine is under a Safe Limited Speed condition. The
following is a typical procedure for accessing the hazardous area by using this
mode.

1. Set the SLS_In input to OFF.

The Safe Speed Limit must not be exceeded after the P53 [LimSpd Mon
Delay], if configured, times out.

2. After the Safe Limited Speed Monitoring Delay has timed out, hold the

enabling switch in the middle position

Once a safe speed is detected and the enabling switch is in the middle
position, the safety option unlocks the door.

3. Continue to hold the enabling switch while you open the door, enter the

hazard area, and perform the required maintenance.

Follow these steps to remove the safe speed condition and resume normal run
operation.

1. Leave the hazard area while holding the enabling switch.

2. Hold the enabling switch until the door is closed and you have disabled the

SLS_In input by setting it to the ON or closed position.

3. Press the reset button, if manual reset is configured.

4. Release the enabling switch.

The machine resumes normal run operation.

ATTENTION: Make sure that the SLS_In input cannot transition to ON while
someone is in the hazard area.

Use appropriate procedures when selecting safe limited speed to prevent other
users from changing the mode while personnel are in the machine area.

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