Fuji Electric FRENIC MEGA G2 Series - Page 472

5.3 Description of Function Codes 5.3.8 J codes (Applied functions)
5-288
 Brake check signal “BRKE” (Function code E01 to E09, data = 65)
If the status of the brake signal “BRKS” fails to agree with the status of the brake check signal “BRKE” during
inverter operation, the inverter enters an alarm stop state with er6.
This signal is used as a feedback signal for the brake signal BRKS. When the mechanical brake does not operate,
it causes the inverter to trip to activate the mechanical brake. The response delay time for BRKS and BRKE can be
adjusted with H180: Brake response time.
H180: Brake signal operation check time, setting range: 0.00 s to 10.00 s
Applying the brake
When the run command is OFF and the output frequency drops below the level specified by J71 (Brake control
signal (Brake-applied frequency/speed)) and stays below the level for the period specified by J72 (Brake control
signal (Brake-applied timer)), the inverter judges that the motor rotation is below a certain level and turns the signal
“BRKS” OFF for activating (applying) the brake.
This operation reduces the load applied to the brake, extending lifetime of the brake.
Function
code
Name
Data setting range
Remarks
J71
Brake-apply
frequency/speed
0.0 to 25.0 Hz
J72
Brake-apply timer
0.000 to 5.000 s
J96
Brake signal (mode
selection)
(Only available when using
vector control with speed
sensor)
0 to 31 (decimal format)
Operation speed (bit 0)
0: Detected speed (default)
1: Reference speed
Specifies the criteria of speed to
be used for Brake-apply
condition.
Condition of brake-apply
control signal (Bit 4)
0: Regardless of run
command status (ON or
OFF) (default)
1: Only when run command is
OFF
Specifies whether to turn off a
brake control signal independent
of a run command ON/OFF or
only when a run command is
OFF. When forward and reverse
operations are switched, brake-
applied conditions may be met in
the vicinity of zero speed.
For such a case, select “Only
when a run command is OFF”
(Bit 4 = 1).
• Brake signals are valid only for motor 1, and when motor 2 to 4 is selected by switching the motor, the
brake signal turns ON. However, brake signals are also enabled with A98, b98, or r98.
• When the inverter is shut down due to an alarm status or coast to stop command, the brake control
signal is immediately applied.
• The stop is determined after the output frequency exceeds “F25 stop frequency + E30 frequency arrival
hysteresis width”, and then the output frequency falls below F25.
To inch the motor (repeatedly turn ON and OFF the run command in a short time), adjust F25 and E30.
速度指令/検出
ブレーキ信号
『BRKS』
OFF
J71:投入周波数
ON
J72:投入タイマ*
F25:停止周波数
F39:停止周波数
継続時間
*タイマカウント中にインバータの出力がOFFした場合，
J72のタイマは無視され，ブレーキが投入されます。
F39: Stop frequency
holding time
Speed
command/detection
J71: Brake-apply frequency
F25: Stop frequency
Brake control signal
"BRKS"
J72 Brake-apply Timer*
* If inverter output was turned off before the timer counts up, then the brake is applied.