Danfoss FC 300 Design Manual page 58

3. Introduction to FC 300
The commissioning test (select one of cases 1 or 2 as applicable):
3
Case 1: Restart prevention for Safe Stop is required (i.e., Safe Stop only where pa-
rameter 5-19 is set to default value [1], or combined Safe Stop and MCB112 where
parameter 5-19 is set to [6] or [9]:
1.
2.
3.
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 (i.e., safe stop only,
where parameter 5-19 is set to [3] or combined safe stop and MCB112, where pa-
rameter 5-19 is set to [7] or [8]:
1.
2.
3.
The test step is passed if the motor becomes operational again. The commissioning test is passed
if all three test steps 2.1, 2.2, and 2.3 are passed.
58
NOTE
Passing a commissioning test is mandatory for fulfilling Safety Category 3 by this
type of installation or application.
Remove the 24 V DC voltage supply to terminal 37 by the interrupt device while the motor
is driven by the FC 302 (i.e., line supply is not interrupted). The test step is passed if the
motor reacts with a coast and the mechanical brake (if connected) is activated, and if an
LCP is mounted, the alarm "Safe Stop [A68]" is displayed.
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.
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. Step 1.4: Send
Reset signal (via Bus, Digital I/O, or [Reset] key). The test step is passed if the motor
becomes operational again.
Remove the 24 V DC voltage supply to terminal 37 by the interrupt device while the motor
is driven by the FC 302 (i.e., line supply is not interrupted). The test step is passed if the
motor reacts with a coast and the mechanical brake (if connected) is activated and if an
LCP is mounted, the warning "Safe Stop [W68]" is displayed.
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.
Reapply 24 V DC to terminal 37.
NOTE
The safe stop function on the FC 302 can be used for asynchronous and synchronous
motors. It may happen that two faults occur in the adjustable frequency drive's
power semiconductor. When using synchronous motors, this may cause a residual
rotation. The rotation can be calculated to Angle=360/(Number of Poles). The ap-
plication using synchronous motors must take this into consideration and ensure that
this is not a safety-critical issue. This situation is not relevant for asynchronous mo-
tors.
MG.33.B9.22 - VLT ® is a registered Danfoss trademark.
FC 300 Design Guide