Sto Commissioning - Danfoss VLT Midi Drive FC 280 Instruction Manual

Safe Torque Off (STO)
FC 280
6 6
1 Safety device
Figure 6.4 STO Wiring in 1 Cabinet, Adjustable Frequency
Drive Provides the Supply Voltage
FC 280
37
38
12
55
1 Safety device
Figure 6.5 STO Wiring, External Supply
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 adjustable frequency drive.
When STO is activated, the adjustable frequency drive
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 adjustable frequency drive in emergency stop
34
1
37
38
12
55
1
•
Eliminate short circuit risks.
•
Ensure that the STO cables are shielded
if they are longer than 20 m (65 ft).
•
Connect the safety device directly to
terminals 37 and 38.
Danfoss A/S © 11/2015 All rights reserved.
®
VLT Midi Drive FC 280
situations. In normal operating mode when STO is not
required, use the standard stop function instead.
NOTICE!
If STO is activated while the adjustable frequency drive
issues warning 8 or alarm 8 (DC undervoltage), the
adjustable frequency drive skips the alarm 68, Safe Stop,
but the STO operation is not affected.
6.3.2 Deactivation of Safe Torque Off
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.
24 V source
•
-
Restart
mode
Manual
restart
Automatic
restart
Table 6.2 STO Deactivation
Ensure that all safety measures are taken before
reapplying 24 V DC supply to terminals 37 and
38.
Steps to deactivate STO Restart mode configu-
and resume normal ration
operation
1. Reapply 24 V DC Default setting.
supply to terminals 37 Parameter 5-19 Terminal
and 38. 37/38 SAFE STOP=[1] Safe
Stop Alarm
2. Initiate a reset signal
(via serial communi-
cation bus, digital I/O
or [Reset]/[Off Reset]
key on the LCP).
Reapply 24 V DC supply Parameter 5-19 Terminal
to terminals 37 and 38. 37/38 SAFE STOP= [3] Safe
Stop Warning.
MG07A122