4.3.4 Test for STO Applications in Manual
Restart Mode
For applications where
parameter 5-19 Terminal 37/38 Safe
Torque Off
is set to the default value
[1] Safe Torque Off
Alarm
, conduct the commissioning test as follows.
1.
Set
parameter 5-40 Function Relay
to
[190] Safe
Function active
.
2.
Remove the 24 V DC voltage supply to terminals
37 and 38 using the safety device while the
frequency converter drives the motor (that is, the
mains supply is not interrupted).
3.
Verify that:
3a
The motor coasts. It may take a long
time for the motor to stop.
3b
If the LCP is mounted,
alarm 68, Safe
Torque Off
shows on the LCP. If the LCP
is not mounted,
alarm 68, Safe Torque
Off
is logged in
parameter 15-30 Alarm
Log: Error Code
.
4.
Reapply 24 V DC to terminals 37 and 38.
5.
Ensure that the motor remains in the coasted
state, and the customer relay (if connected)
remains activated.
6.
Send reset signal (via fieldbus, digital I/O, or
[Reset]/[Off Reset] key on the LCP).
7.
Ensure that the motor becomes operational and
runs within the original speed range.
The commissioning test is successfully completed when all
the above-mentioned steps are passed.
4.3.5 Test for STO Applications in
Automatic Restart Mode
For applications where
parameter 5-19 Terminal 37/38 Safe
Torque Off
is set to
[3] Safe Torque Off Warning
, conduct the
commissioning test as follows:
1.
Remove the 24 V DC voltage supply to terminals
37 and 38 by the safety device while the
frequency converter drives the motor (that is, the
mains supply is not interrupted).
2.
Verify that:
2a
The motor coasts. It may take a long
time for the motor to stop.
2b
If the LCP is mounted
Warning 68, Safe
Torque Off W68
, shows on the LCP. If the
LCP is not mounted,
Warning 68, Safe
Torque Off W68
is logged in bit 30 of
parameter 16-92 Warning Word
.
3.
Reapply 24 V DC to terminals 37 and 38.
4.
Ensure that the motor becomes operational and
runs within the original speed range.
The commissioning test is successfully completed when all
the above-mentioned steps are passed.
NOTICE
See the warning on the restart behavior in
chapter 4.1 Safety Precautions for STO
4.4 Maintenance and Service for STO
•
The user is responsible for security measures.
•
The frequency converter parameters can be
protected with a password.
The functional test consists of 2 parts:
•
Basic functional test.
•
Diagnostic functional test.
When all the steps are completed successfully, the
functional test is successful.
Basic functional test
If the STO function has not been used for 1 year, conduct
a basic functional test to detect any failure or malfunction
of STO.
1.
Ensure that
parameter 5-19 Terminal 37/38 Safe
Torque Off
is set to
*[1] Safe Torque Off Alarm
.
2.
Remove the 24 V DC voltage supply for terminals
37 and 38.
3.
Check if the LCP shows
alarm 68, Safe Torque Off
.
4.
Verify that the frequency converter trips the unit.
5.
Verify that the motor is coasting and stops
completely.
6.
Initiate a start signal (via fieldbus, digital I/O, or
the LCP), and verify that the motor does not start.
7.
Reconnect the 24 V DC voltage supply to
terminals 37 and 38.
8.
Verify that the motor is not started automatically
and restarts only by giving a reset signal (via
fieldbus, digital I/O, or [Reset]/[Off Reset] key on
the LCP).
Diagnostic functional test
1.
Verify that
warning 68, Safe Torque Off
and
alarm
68, Safe Torque Off
do not occur when 24 V
supply is connected to terminals 37 and 38.
2.
Remove the 24 V supply for terminal 37, and
verify that the LCP shows
alarm 188, STO Function
Fault
if the LCP is mounted. If the LCP is not
mounted, verify that
alarm 188, STO Function Fault
is logged in
parameter 15-30 Alarm Log: Error
Code
.
Safe Torque Off (STO)
VLT
®
Midi Drive FC 280
52
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MG07B102
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