Error Cause What to do
10033
ecSTO_ACTIVE
Either one or both of the
S
TO inputs is not powered.
This error is detected when
the drive is enabled, or
when attempting to enable
the drive in software.
- safe switch or relay has
dropped
an output that
controls the STO input.
Use a test meter to check that
the device contr
olling the STO
input is providing the required
output.
- emergency stop switch
has b
een operated.
Check the operation of the
emergency stop switch. Check
that the contacts close correctly
when the switch is reset.
- faulty safety relay Check the operation of the
safety relay
.
10035
ecSTO_INPUT_MISMATCH
The drive has detected a
mi
smatch in its internal STO
registers.
This error can occur while
the drive is enabled or
disabled.
Check the operation of the
emerg
ency stop switch. Check
that the contacts close correctly
when the switch is reset.
Check that the period defined
by STOINPUTMISMATCHTIME
is long enoug
h to allow both
STO inputs to settle.
- emergency stop switch
fault
Check the operation of the
emerg
ency stop switch. Check
that the contacts close correctly
when the switch is reset.
- wiring fault Check all wiring for the STO
in
puts.
Appendix: Safe Torque Off (STO) 203
Decommissioning
Before decommissioning any safety system from active service:
• Evaluate the impact of decommissioning on adj
acent operating units and facilities
or other field services.
• Conduct a proper review and obtain required authorization.
• Ensure that the safety functions remain appropriate during decommissioning
a
ctivities.
Implement appropriate change management procedures for all decommissioning
activities
.
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