Close Frequency Limit
Output Frequency
Open Frequency Limit
Brake
Mech. Delay
Open Mech. Brake
Command (Digital output)
Start Command
ID1539
ID1535
1
2
3
5
4
6
7
Fig. 88: The Mechanical brake function
1. A Start command is given.
2. We recommend that you use start
magnetisation to build rotor flux fast and
to decrease the time when the motor can
produce nominal torque.
3. When the start magnetisation time is
over, the system lets the the frequency
reference go to the open frequency limit.
4. The mechanical brake opens. The
frequency reference stays at the open
frequency limit until the brake
mechanical delay is over, and the correct
brake feedback signal is received.
5. The output frequency of the drive follows
the normal frequency reference.
6. A Stop command is given.
7. The mechanical brake becomes closed
when the output frequency goes below
the close frequency limit.
SET
RESET
IN
IN
IN
IN
Open Freq Limit
Output Frequency
IN
IN
Close Freq Limit
Output Frequency
IN
IN
Running
Running
Run Request
Fault
IN
IN
IN
IN
IN
IN
IN
IN
IN
Motor Current
Brake Current Limit
MechanicBrake
MechanicBrakeInv
IN
P
I/O
I/O
NOT
RS
AND
1
2
GE
1
2
P
M
V
LE
1
2
P
M
NOT
NOT
V
V
V
OR
1
2
3
AND
1
2
OR
1
2
LT
1
2
M
Fig. 89: The mechanical brake opening logic
PARAMETER DESCRIPTIONS
VACON · 323
LOCAL CONTACTS: HTTP://DRIVES.DANFOSS.COM/DANFOSS-DRIVES/LOCAL-CONTACTS/
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