2.2.2 Safe Stop Commissioning Test
After installation and before first operation, perform a
commissioning test of an installation or application, using
Safe Stop.
Perform the test again after each modification of the
installation or application involving the Safe Stop.
NOTE
A passed commissioning test is mandatory after first instal-
lation and after each change to the safety installation.
The commissioning test (select one of cases 1 or 2 as
applicable):
Case 1: Restart prevention for Safe Stop is required (that is
Safe Stop only where
5-19 Terminal 37 Safe Stop
is set to
default value [1], or combined Safe Stop and MCB 112
where
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 Stop [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 Stop 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 Stop is wanted and
allowed (that is, Safe Stop only where
5-19 Terminal 37
Safe Stop
is set to [3], or combined Safe Stop and MCB
112 where
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.
The test step is passed if the motor becomes operational
again. The commissioning test is passed if both test steps
2.1 and 2.2 are passed.
NOTE
See warning on the restart behaviour in
NOTE
The Safe Stop 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.
NOTE
The Safe Stop function can be used for asynchronous,
synchronous and permanent magnet motors. It may
happen that two faults occur in the frequency converter's
power semiconductor. When using synchronous or
permanent magnet motors this may cause a residual
rotation. The rotation can be calculated to Angle = 360/
(Number of Poles). The application using synchronous or
permanent magnet motors must take this into consid-
eration and ensure that this is not a safety critical issue.
This situation is not relevant for asynchronous motors.
Safety Instructions and Gen...
Operating Instructions VLT
®
CDS302 and CDS303
MG34M302 - VLT
®
is a registered Danfoss trademark/Commercial Compressor
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