OPERATION
710-14888-00C EMX4i User Manual 55
Brake operation causes the motor to heat faster than the rate calculated by
the motor thermal model. If you are using brake, install a motor thermistor
or allow sufficient restart delay (parameter 5P).
Speed
1:
Stop Time
(parameter 2J)
2:
Brake Time
(parameter 2P)
3: Coast to stop time
Time
Parameter settings:
• Parameter 2I
Stop Mode
: set to 'DC Brake'.
• Parameter 2J
Stop Time
: This is the total braking time (1) and must be set
sufficiently longer than the brake time (parameter 2P) to allow the
pre-braking stage to reduce motor speed to approximately 70%. If the
stop time is too short, braking will not be successful and the motor will
coast to stop.
• Parameter 2O
DC Brake Torque
: set as required to slow the load. If set
too low, the motor will not stop completely and will coast to stop after the
end of the braking period.
• Parameter 2P
DC Brake Time
: Set Brake Time (parameter 2P) to
approximately one quarter of the programmed Stop Time. This sets the
time for the Full Brake stage (2).
DC Brake with External Zero Speed Sensor
For loads which may vary between braking cycles, install an external zero-speed
sensor to ensure the soft starter ends DC braking when the motor has reached a
standstill. This avoids unnecessary motor heating.
Configure DC brake for the longest braking time required, and also set parameter
7A
Input A Function
to 'Zero Speed Sensor'. When the motor reaches a standstill,
the zero speed sensor opens the circuit across 13, 14 and the soft starter
terminates the stop.
To Next Page
Loading...
