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F codes
E codes
C codes
P codes
H codes
A codes
b codes
r codes
J codes
d codes
U codes
y codes
Ch
ap
. 5
FUNCTION C
O
DES
J68 to J70
J71, J72
J95, J96
Brake Signal (Brake-OFF current, Brake-OFF frequency/speed and Brake-OFF timer)
Brake Signal (Brake-ON frequency/speed and Brake-ON timer)
Brake Signal (Brake-OFF torque and Speed condition selection)
These function codes are for the brake releasing/turning-on signals of vertical carrier machines.
It is possible to set the conditions of the brake releasing/turning-on signals (current, frequency or torque) so that a hoisted
load does not fall down at the start or stop of the operation, or so that the load applied to the brake is reduced.
Brake signal --
BRKS
(E20 to E24 and E27, data = 57)
This signal outputs a brake control command that releases or activates the brake.
Releasing the Brake
When any of the inverter output current, output frequency, or torque command value exceeds the specified level of the brake
signal (J68/J69/J95) for the period specified by J70 (Brake signal (Brake-OFF timer)), the inverter judges that required
motor torque is generated and turns the signal
BRKS
ON for releasing the brake.
This prevents a hoisted load from falling down due to an insufficient torque when the brake is released.
Function
code
Name Data
setting
range
Remarks
J68 Brake-OFF
current
0% to 300%:
Set it putting the inverter rated current
at 100%.
See Note below.
J69
Brake-OFF frequency/speed 0.0 to 25.0 Hz
Available only under V/f control.
J70
Brake-OFF timer
0.0 to 5.0 s
J95
Brake-OFF torque
0% to 300%
Available only under vector control.
J96
Speed condition selection
(Braking conditions)
Response for brake-OFF current (Bit 2)
0: Slow response (default)
1: Quick response
Specifies the response type for
brake-OFF current detection.
Selecting slow response inserts a
detection filter into the current detection
circuit so that the brake-OFF timing will
be slightly behind the rising edge of the
actual current.
If the delay is not negligible with
adjustments, select quick response.
The inverter rated current differs depending upon the drive mode selected (LD, MD or HD).
Turning the Brake ON
When the run command is OFF and the output frequency drops below the level specified by J71 (Brake signal (Brake-ON
frequency/speed)) and stays below the level for the period specified by J72 (Brake signal (Brake-ON timer)), the inverter
judges that the motor rotation is below a certain level and turns the signal
BRKS
OFF for activating the brake.
Under vector control, when the reference speed or the detected one drops below the level of the brake-ON frequency
(specified by bit 3 of J96) and stays below the level for the period specified by J72 (Brake signal (Brake-ON timer)), the
inverter judges that the motor rotation is below a certain level and turns the signal
BRKS
OFF for activating the brake.
Содержание FRENIC-MEGA
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