Lenze i510 - Inverter Motor Brake

10.4.2 Inverter motor brake
With this braking method, which can be selected in 0x2541:001 (PAR 706/001), the regenera-
ve ener
gy in the motor is converted as a result of dynamic acceleraon/deceleraon with
down-ramping of the ramp funcon generator.
NOTICE!
Too frequent braking may cause thermal overload of the motor.
▶
Avoid acvang the "Inverter motor brake" funcon over a longer me!
▶
In applicaons with a high mass inera and long braking mes (> 2 s), use the "DC braking"
funcon.
Precondions
•
The "Inverter motor br
ake" braking method must not be used with vercal conveyors
(hoists) or with acve loads!
•
The "Inverter motor br
ake" braking method only works in operang mode 0x6060
(PAR 301)= "-2: Lenze velocity mode".
•
The motor overload monitoring funcon is not adapted, so that it may possibly not work
correctly.
Details
During the acceleraon process, the ramp funcon generator is stopped. By means of a hyste-
resis 2 point DC-bus voltage controller, the frequency set in 0x2541:004 (PAR 706/004) is
added to the frequency setpoint, taking the sign of the current actual frequency into consider-
aon. Furthermore the ramp funcon generator is stopped in a state of overvoltage. If the DC-
bus voltage falls below a dened DC-bus voltage potenal of the hysteresis controller, the
addional frequency connected is reduced again and the ramp funcon generator is re-acva-
ted. By the alternang acceleraon and deceleraon resulng from this circuit, the energy is
converted thermally in the motor. For process-related reasons, torque oscillaons may occur.
Seng instrucons
Generally, the smallest value possible required by the applicaon for being able to sll tra-
verse the load to be moved in a controlled fashion should be set as addional frequency.
Greater mass inera values require an increase in the rated motor frequency set. Increasing
the rated motor frequency, however, causes greater torque oscillaons. A possible conse-
quence is the reduced service life of mechanical components. Furthermore an increase in the
rated motor frequency also increases the energy converted into heat in the motor. A possible
consequence is the reduced service life of the motor.
Parameter Name / value range / [default seng] Info
0x2541:004
(PAR 706/004)
Brake energy manag
ement: Addional frequency
(Brake management: Add.frequency)
0.0 ... [0.0] ... 10.0 Hz
Frequency deviaon which is connected to the deceleraon ramp in a
pulsave fashion when the "Inverter motor brake" braking method is
used.
0x2C01:005
(PAR 320/005)
Motor parameters: Rated frequency
(Motor parameters: Mot. frequency)
1.0 ... [50.0] ... 1000.0 Hz
General motor parameters.
Carry out sengs as specied by motor nameplate data.
0x6060
(PAR 301)
Modes of operaon
(Modes of op.)
•
Seng can only be changed if controller inhibit is
acve.
Selecon of the operang mode.
-2 Lenze speed mode
0 Mode not changed or assigned No operang mode (standsll).
2 Velocity mode
Addional funcons
Brake energy manag
ement
Inverter motor brake
157
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.actechdrives.com - Email: info@actechdrives.com