Commissioning
4 Commissioning
4.1 Safety Instructions
See chapter 2 Safety for general safety instructions.
4.2 Activation of STO
The STO function is activated by removing the voltage at
terminal 37 of the adjustable frequency drive. By
connecting the adjustable frequency drive 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 (terminal 37) is activated, the
adjustable frequency drive issues an alarm, trips the unit,
and coasts the motor to a stop. Manual restart is required.
Use the STO function to stop the adjustable frequency
drive 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 paragraph 6.3.3.2.5 are fulfilled before using the
automatic restart function.
4.3 Parameter Settings for STO in
Combination with VLT
Card MCB 112
When MCB 112 is connected, additional selections are
available for 5-19 Terminal 37 Digital Input ([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 adjustable
frequency drive reacts with an alarm Dangerous
Failure [A72] and coasts the motor 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 STO.
If selection [4] PTC 1 Alarm or [5] PTC 1 Warning is
selected and the external safety device triggers
STO, the adjustable frequency drive issues an
alarm Dangerous Failure [A72] and coasts the
motor safely, without automatic restart.
MG37D222
Instruction Manual
®
PTC Thermistor
Danfoss A/S © 09/2014 All rights reserved.
•
Select [6] PTC 1 & Relay A to [9] PTC 1 & Relay W/A
for the combination of external safety device and
MCB 112.
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:
•
The unintended restart prevention is
implemented by other parts of the STO instal-
lation, or
•
A presence in the dangerous zone can be
physically excluded when STO is not activated.
In particular, paragraph 6.3.3.2.5 of ISO
12100:2010 must be observed.
®
See VLT
PTC Thermistor Card MCB 112 Instruction Manual
for further information.
4.4 Automatic/Manual Restart Behavior
By default the STO function is set to unintended restart
prevention behavior. To terminate STO and resume normal
operation:
1.
Reapply 24 V DC supply to Terminal 37.
2.
Give a reset signal (via Bus, Digital I/O, or [Reset]
key).
Set the STO function to automatic restart by setting the
value of 5-19 Terminal 37 Digital Input 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.
4.5 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.
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