WARNING
Automatic Restart Behaviour is permitted in one of the
two situations:
1.
The Unintended Restart Prevention is
implemented by other parts of the Safe Torque
Off installation.
2.
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
2.2.2 Safe Torque Off Commissioning Test
After installation and before first operation, perform a
commissioning test of an installation or application, using
Safe Torque Off.
Perform the test again after each modification of the
installation or application involving the Safe Torque Off.
NOTICE!
A passed commissioning test is mandatory after first
installation and after each change to the safety instal-
lation.
The commissioning test (select one of cases 1 or 2 as
applicable):
Case 1: Restart prevention for Safe Torque Off is
required (that is Safe Torque Off only where
parameter 5-19 Terminal 37 Safe Stop
is set to default
value [1], or combined Safe Torque Off and MCB 112
where
parameter 5-19 Terminal 37 Safe Stop
is set to
[6]
PTC 1 & Relay A
or
[9] PTC 1 & Relay W/A
):
1.1 Remove the 24 V DC voltage supply to
terminal 37 using the interrupt device while the
frequency converter drives the motor (that is
mains supply is not interrupted). The test step is
passed when
•
the motor reacts with a coast, and
•
the mechanical brake is activated (if
connected)
•
the alarm “Safe Torque Off [A68]” is
displayed in the LCP, if mounted
1.2 Send Reset signal (via Bus, Digital I/O, or
[Reset] key). The test step is passed if the motor
remains in the Safe Torque Off state, and the
mechanical brake (if connected) remains
activated.
1.3 Reapply 24 V DC to terminal 37. The test step
is passed if the motor remains in the coasted
state, and the mechanical brake (if connected)
remains activated.
1.4 Send Reset signal (via Bus, Digital I/O, or
[Reset] key). The test step is passed when the
motor becomes operational again.
The commissioning test is passed if all four test steps 1.1,
1.2, 1.3 and 1.4 are passed.
Case 2: Automatic Restart of Safe Torque Off is wanted
and allowed (that is, Safe Torque Off only where
parameter 5-19 Terminal 37 Safe Stop
is set to [3], or
combined Safe Stop and MCB 112 where
parameter 5-19 Terminal 37 Safe Stop
is set to
[7] PTC 1 &
Relay W
or
[8] PTC 1 & Relay A/W
):
2.1 Remove the 24 V DC voltage supply to
terminal 37 by the interrupt device while the
frequency converter drives the motor (that is
mains supply is not interrupted). The test step is
passed when
•
the motor reacts with a coast, and
•
the mechanical brake is activated (if
connected)
•
the alarm “Safe Stop [A68]” is displayed
in the LCP, if mounted
2.2 Reapply 24 V DC to terminal 37.
If the motor becomes operational again, The test step is
passed. If both test steps 2.1 and 2.2 are passed, the
commissioning test is passed.
NOTICE!
See warning on the restart behaviour in
chapter 2.2.1 Terminal 37 Safe Torque Off Function
WARNING
The Safe Torque Off function can be used for
asynchronous, synchronous and permanent magnet
motors. Two faults can occur in the power semiconductor
of the frequency converter. When using synchronous or
permanent magnet motors a residual rotation can result
from the faults. The rotation can be calculated to Angle
= 360/(Number of Poles). The application using
synchronous or permanent magnet motors must take
this residual rotation into consideration and ensure that
it does not pose a safety risk. This situation is not
relevant for asynchronous motors.
Safety Instructions and Gen...
Operating Instructions
MG34M422
Danfoss A/S © Rev. 2013-07-03 All rights reserved.
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