Page E–4
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Appendix E: Safe Torque Off
Sto ParameterS
Type Hex Addr Dec Addr
P6.71 STO Alarm Latch
♦R/W 0647 41608
Range/Units Default
0: STO Alarm Latch
1: STO Alarm no Latch
0
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.)
Type Hex Addr Dec Addr
P6.29 Line Start Lockout
♦R/W 061D 41566
Range/Units Default
0: Enable start-up lockout
1: Disable start-up lockout
0
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.
Type Hex Addr Dec Addr
P3.17 Multi-Function Output Terminal 1 (Relay 1)
♦R/W 0311 40786
P3.18 Multi-Function Output Terminal 2 (Relay 2)
♦R/W 0312 40787
Settings Pertaining to STO Function
Settings Functions Descriptions
56 SO Logic A output Safety Output normally-open contact
57 SO Logic B output Safety Output normally-closed contact
Drive Status Safety Output Status
– NO (P3�17/P3�18 = 56) NC (P3�17/P3�18 = 57)
Normal Run open close
STO close open
STL1~STL3 close open
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