External Brake Control - Larsen & Toubro C*2000 Series User Manual

Chapter 8 Application

8.18 External brake control

Group Code
Function group 2 H40
I/O group
I 82
I 83
I 84
I 85
I 86
I 87
I 55
 I82~87 is visible only when I55 is set to 19.
 The function will be used to control ON/OFF of brake in the load system, in addition the Set Value shall be 0 (V/F
control) for the control pattern (H40). The control pattern and order shall be confirmed before use.
After brake control starts, prevent DC brake and frequency protection

 Brake open order
Input motor operation command, the inverter accelerates to forward/reverse start frequency (I84, I85), and the
motor current reaches the start current (I82), the output relay will release bake start signal, maintain the
start delay time of brake before acceleration.
Brake close order

Input Stop command in operation, the motor will decelerate, and stop deceleration after the output frequency
reaches the brake close frequency (I87), the output relay will release bake close signal, maintain the close delay
time of brake (I86), and the output frequency will be "0".
O u tp u t F re q .
O u tp u t C u rre n t
M o to r S p e e d
B ra k e o u tp u t
te rm in a l
R u n C o m m a n d
8-26
Item
Controlling method select
Brake open current
Brake open delay time
Brake open CW Freq.
Brake open CCW Freq.
Brake close delay time
Brake close Freq.
Multi-function relay select
I 8 4 , I 8 5
I 8 2
I 8 3
B ra k e O p e n tim e
B ra k e C lo s e tim e
Control method: V/F constant speed
operation
Set Value Setting Range
0 0~3
- 0.0~180.0
- 0.00~10.00
- 0.00~400.00
- 0.00~400.00
- 0.00~10.00
- 0.00~400.00
19 0~ 19
I 8 7
I 8 6
B ra k e C lo s e tim e
Initial Unit
0
50.0 %
1.00 sec
1.00 Hz
1.00 Hz
1.00 sec
2.00 Hz
17
Cx2000 AC Drive