Rockwell Automation 2094-EN02D-M01-S1 Kinetix 6200 and Kinetix 6500 Safe Speed Monitoring Safety Reference Manual - Manual (Page 84)

84 Rockwell Automation Publication 2094-RM001C-EN-P - May 2013
Chapter 7 Safe Limited Speed (SLS) Modes
Safe Limited Speed Status
Only Mode When properly configured for Safe Limited Speed Status Only, the drive
provides Safe Limited Speed status information in addition to the Safe Stop
functions as described in
Safe Stop Mode on page 55 .
When the Safe Limited Speed input (SLS_In) is OFF, the feedback velocity is
monitored and compared against a configurable Safe Speed Limit. If the
measured velocity exceeds the limit, no stopping action takes place. Instead, the
system status is made available as a safe output intended for a safety
programmable logic controller (PLC).
You can program an optional [Safe Limited Speed Monitor Delay] to delay the
start of Safe Limited Speed monitoring.
Safe Limited Speed monitoring is requested by a transition of the SLS_In input
from ON to OFF. If you configure a [Safe Limited Speed Monitor Delay], the
delay begins when Safe Limited Speed monitoring is requested by the SLS_In
input transition from ON to OFF. The drive begins monitoring for Safe Limited
Speed when the delay times out. The SLS_Out output is ON if Safe Limited
Speed monitoring is active and the speed is below the configured Safe Speed
Limit, considering hysteresis.
Figure 24 - Timing Diagram for Safe Limited Speed Status Only
TIP In Safe Limited Speed Status Only mode, Door Monitoring and Enabling
Switch Monitoring are not available.
ATTENTION: When the drive is properly configured for Safe Limited Speed
Status Only mode, it does not automatically initiate a Safe Stop in the event of
an overspeed condition.
Low
Threshold
(1)
SLS_In
SLS_Out
SLS
Request
Safe Speed
Limit
Speed
Time
SLS Monitoring Delay Safe Limited Speed
Active
SLS Request
Removed
(1) Low Threshold = (Speed Hysteresis/100) x Safe Speed Limit