6.5.1 Restart behaviour after STO activation
By default the STO function is set to unintended-restart prevention
behaviour. To terminate STO and resume normal operation with
manual reset, do the following:
• Reapply 24 V DC supply to terminal 37.
• Send a reset signal via bus, Digital I/O or the reset button.
• Set the STO function to automatic restart by changing the value
of 5-19 terminal 37 "Safe Stop" from default value 1. "Safe Stop
Alarm" to value 3, "Safe Stop Warning".
Automatic restart means that STO is terminated, and normal
operation is resumed, as soon as the 24 V DC is applied to terminal
37. No reset signal is required.
Related information
6.7 Connecting the signal relays
6.5.2 Restart settings
• Remove the 24 V DC voltage supply to terminal 37 using the
interrupt device while the frequency converter drives the motor,
that is the mains supply is not interrupted.
• Check that the motor coasts and that the alarm Safe Stop
displays in the local operating panel if mounted.
• Reapply 24 V DC to terminal 37.
• Ensure that the motor remains in the coasted state.
• Send reset signal via bus, Digital I/O or the reset button.
• Ensure that the motor becomes operational again.
6.6 Connecting the signal terminals
As a precaution, signal cables must be separated from
other groups by reinforced insulation in their entire
lengths.
Connect the signal cables according to the guidelines for good
practice to ensure EMC-correct installation. See section Restart
behaviour after STO activation.
• Use screened signal cables with a conductor cross-section of
minimum 0.5 mm
2
and maximum 1.5 mm
2
.
• Use a 3-conductor screened bus cable in new systems.
6.6.1
Wiring diagram, signal terminals
U: 0-10 V
I: 0/4-20 mA
TM051506
External setpoint, voltage input
TM051508
2-wire sensor
14
English (US)
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