Sto Commissioning - Danfoss VLT Midi Drive FC 280 Operating Instructions Manual

Safe Torque Off (STO)
FC 280
37
38
12
55
1 Safety device
Illustration 6.5 STO Wiring, External Supply
6 6 3. Complete the wiring according to the instructions
in chapter 4 Electrical Installation, and:
•
•
•

6.3 STO Commissioning

6.3.1 Activation of Safe Torque Off
To activate the STO function, remove the voltage at
terminals 37 and 38 of the frequency converter.
When STO is activated, the frequency converter issues
alarm 68, Safe Stop or warning 68, Safe Stop, trips the unit,
and coasts the motor to stop. Use the STO function to stop
the frequency converter in emergency stop situations. In
normal operating mode when STO is not required, use the
standard stop function instead.
NOTICE
If STO is activated while the frequency converter issues
warning 8 or alarm 8 (DC undervoltage), the frequency
converter skips the alarm 68, Safe Stop, but the STO
operation is not affected.
34
®
VLT
1
Eliminate short circuit risks.
Ensure that the STO cables are screened
if they are longer than 20 m.
Connect the safety device directly to
terminals 37 and 38.
Danfoss A/S © 11/2015 All rights reserved.
Midi Drive FC 280
6.3.2 Deactivation of Safe Torque Off
+
24 V source
Follow the instructions in Table 6.2 to deactivate the STO
-
function and resume normal operation based on the
restart mode of the STO function.
WARNING
RISK OF INJURY OR DEATH
Reapplying 24 V DC supply to either terminal 37 or 38
terminates the SIL2 STO state, potentially starting the
motor. Unexpected motor start may cause personal
injuries or death.
•
Ensure that all safety measures are taken before
reapplying 24 V DC supply to terminals 37 and
38.
Restart Steps to deactivate STO
mode and resume normal
operation
Manual 1. Reapply 24 V DC
restart
2. Initiate a reset signal
Automatic Reapply 24 V DC supply
restart to terminals 37 and 38.
Table 6.2 STO Deactivation
6.3.3 STO Commissioning Test
After installation and before first operation, perform a
commissioning test of the installation using STO.
Perform the test again after each modification of the
installation or application involving the STO.
NOTICE
A successful commissioning test of the STO function is
required after the initial installation, and after each
subsequent change to the installation.
To perform a commissioning test:
•
Follow the instructions in chapter 6.3.4 Test for
STO Applications in Manual Restart Mode if STO is
set to manual restart mode.
•
Follow the instructions in chapter 6.3.5 Test for
STO Applications in Automatic Restart Mode if STO
is set to automatic restart mode.
Restart mode configu-
ration
Default setting.
Parameter 5-19 Terminal
supply to terminals 37
and 38. 37/38 SAFE STOP=[1] Safe
Stop Alarm
(via fieldbus, digital
I/O, or [Reset]/[Off
Reset] key on the
LCP).
Parameter 5-19 Terminal
37/38 SAFE STOP= [3] Safe
Stop Warning.
MG07A102