Appendix E: Safe Torque Off
Sto P
arameterS
P6.71
STO Alarm Latch
Range/Units
0: STO Alarm Latch
1: STO Alarm no Latch
Setting Explanations:
0: STO Alarm Latch: After the reason for an STO Alarm is cleared, a Reset command is needed to
clear the STO Alarm unless Fire Mode is turned ON. Once the STO Alarm is cleared, Fire Mode
can run the drive without first having received a reset signal. Fire Mode will also run the drive
after an STL1 or STL2 alarm is cleared without needing a power cycle.
1: STO Alarm no Latch: After the reason for an STO Alarm is cleared, the STO Alarm will be cleared
automatically. Cycling the run command OFF then ON is required, even if P6.29=1 (Line Start
Lockout disabled).
All of the STL1~STL3 errors are "Alarm Latch" mode. (In STL1~STL3 mode, the P6.71 function is not
effective.)
P6.29
Line Start Lockout
Range/Units
0: Enable start-up lockout
1: Disable start-up lockout
Setting Explanations:
0: Enable. When this parameter is enabled, the GS4 drive will not start the motor when powered
up with a RUN command already applied. The drive must see the RUN command change from
STOP to RUN before it will start.
1: Disable. When this parameter is disabled, the GS4 drive will start the motor when powered up
with a RUN command already applied.
When Safe Torque Off (STO) alarms STL1 or STL2 are activated, a power cycle is
required to reset the drive. When P6.29 is set to 1, the drive will start on power-up
while performing this reset condition.
P3.17
Multi-Function Output Terminal 1 (Relay 1)
P3.18
Multi-Function Output Terminal 2 (Relay 2)
Settings Pertaining to STO Function
Settings
Functions
56
SO Logic A output
57
SO Logic B output
Page E–4
Descriptions
Safety Output normally-open contact
Safety Output normally-closed contact
Drive Status
Safety Output Status
–
NO (P3�17/P3�18 = 56)
Normal Run
open
STO
close
STL1~STL3
close
DuRA
pulse
NC (P3�17/P3�18 = 57)
close
open
open
GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Type
Hex Addr
Dec Addr
♦R/W
0647
41608
Default
0
Type
Hex Addr
Dec Addr
♦R/W
061D
41566
Default
0
Type
Hex Addr
Dec Addr
♦R/W
0311
40786
♦R/W
0312
40787
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