Commissioning
4 Commissioning
4.1 Safety Instructions
See chapter 2 Safety for general safety instructions.
4.2 Activation and Termination of Safe
Torque Off
The STO function is activated by removing the voltage at
terminal 37 of the frequency converter. By connecting the
frequency converter to external safety devices providing a
safe delay, an installation for a Safe Stop 1 can be
obtained. External safety devices need to fulfill Cat./PL or
SIL when connected to terminal 37. The STO function can
be used for asynchronous, synchronous, and permanent
magnet motors.
When the STO function (T37) is activated, the frequency
converter issues an alarm, trips the unit, and coasts the
motor to a stop. Manual restart is required. 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. Ensure
that requirements according to ISO 12100-2 paragraph
5.3.2.5 are fulfilled, before using the automatic restart
function.
4.3 Parameter Settings for STO in
Combination with Thermistor Module
MCB 112
When MCB 112 is connected, additional selections are
available for 5-19 Terminal 37 Safe Stop ([4] PTC 1 Alarm to
[9] PTC 1 & Relay W/A).
•
Selections [1]* Safe Stop Alarm and [3] Safe Stop
Warning are still available, but are for installations
without MCB 112 or any external safety devices.
If [1]* Safe Stop Alarm or [3] Safe Stop Warning are
selected and MCB 112 is triggered, the frequency
converter reacts with an alarm "Dangerous Failure
[A72]" and coast the frequency converter safely,
without automatic restart.
•
Selections [4] PTC 1 Alarm and [5] PTC 1 Warning
are not to be selected when an external safety
device is used. Those selections are for when only
MCB 112 uses the Safe Torque Off.
If selection [4] PTC 1 Alarm or [5] PTC 1 Warning is
selected and the external safety device triggers
Safe Torque Off, the frequency converter issues
an alarm "Dangerous Failure [A72]" and coasts
the frequency converter safely, without automatic
restart.
®
VLT
Frequency Converters - Safe Torque Off Operating Instructions
•
CAUTION
Selections allow for automatic restart when the external
safety device is de-activated.
Before selecting [7] PTC 1 & Relay W or [8] PTC 1 & Relay
A/W, ensure that:
•
•
See Operating Instructions for Thermistor Module MCB
112 for further information.
4.4 Automatic/Manual Restart Behaviour
By default the STO function is set to unintended restart
prevention behaviour. To terminate STO and resume
normal operation:
1.
2.
Set the STO function to automatic restart by setting 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.
MG37D102 - Rev. 2013-11-15
Select [6] PTC 1 & Relay A to [9] PTC 1 & Relay W/A
for the combination of external safety device and
MCB 112.
the unintended restart prevention is
implemented by other parts of the Safe Torque
Off installation, or:
a presence in the dangerous zone can be
physically excluded when Safe Torque Off is not
activated. In particular, paragraph 5.3.2.5 of ISO
12100-2 2003 must be observed.
Reapply 24 V DC supply to Terminal 37.
Give a reset signal (via Bus, Digital I/O, or [Reset]
key).
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