Sls Function - Mitsubishi Electric 800 Series Instruction Manual

5.3

SLS function

This function is used to activate the STO function after a specified time when the motor speed (output frequency) exceeds a
specified limit.
Four operation patterns can be selected by setting different limits using SLS1 to SLS4 functions.
To use this function, specifications and operating conditions of motor speed estimation must be satisfied. (Refer to
Pr.
Monitoring speed selection
*1
S001
S005 SLS mode selection
S006 SLS frequency 1
S007 SLS frequency 2
S008 SLS frequency 3
S009 SLS frequency 4
S010 SLS deceleration monitoring
time 1
S011 SLS deceleration monitoring
time 2
S012 SLS deceleration monitoring
time 3
S013 SLS deceleration monitoring
time 4
S014 SLS operation frequency 1
S015 SLS operation frequency 2
S016 SLS operation frequency 3
S017 SLS operation frequency 4
S018 SLS speed detection delay
time
*1 To use the SLS function, set Pr.S001 = "1". When the SLS function is activated while Pr.S001 = "0 (initial value)", "E.SAF" (fault detail code 71)
is displayed.
 Basic operation
The following shows the operation example when only the SLS1 function is activated (Pr.S005 = "0 (initial value)").
• The SLS1 function is activated by turning OFF the SLS1 command (SLS1C) signal.
• Speed monitoring is started when the time set in Pr.S010 elapses after the SLS1 function is activated.
• When the motor speed exceeds the Pr.S006 setting, counting of the overspeed time is started. The overspeed time is
cleared when the speed is decreased to the Pr.S006 setting or lower.
• When the overspeed time reaches the Pr.S018 setting, "E.SAF" (fault detail code 72) is displayed and the STO function is
activated.
• When the SLS1C signal is turned ON, the SLS1 function is terminated.
24
5. Safety Sub-Functions
5.3 SLS function
Name Initial
value
0
0
6 Hz
6 Hz
6 Hz
6 Hz
5 s
5 s
5 s
5 s
3 Hz
3 Hz
3 Hz
3 Hz
0 s
Setting
range
0 Speed monitoring is disabled.
1 Monitoring is enabled using the estimated speed.
0 The frequency command is not changed automatically when
the SLS function is activated.
1 The frequency command is changed automatically when the
SLS function is activated.
0 to 60 Hz Set the level to detect the overspeed.
0 to 60 Hz
0 to 60 Hz
0 to 60 Hz
0 to 3600 s Set the time from when the SLS function is activated until
speed monitoring is started.
0 to 3600 s
0 to 3600 s
0 to 3600 s
0 to 60 Hz When Pr.S005 = "1", set the frequency command used when
the SLS function is activated. Set a value smaller than the
0 to 60 Hz
corresponding SLS frequency (Pr.S006 to Pr.S009).
0 to 60 Hz
0 to 60 Hz
0 to 60 s Set the time from when the motor speed exceeds the
overspeed judgment level until the STO function is activated.
page
Description
7.)