SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
SJ700-2 Instruction Manual NT204DX - Hitachi America, Ltd.
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Chapter 4 Explanation of Functions<br />
When using the brake control function, assign the following signal functions to intelligent input and<br />
intelligent output terminals as needed.<br />
(1) To input a signal indicating that the brake is released from the external brake to the inverter, assign the<br />
braking confirmation signal (44: BOK) to one of the terminal [1] to [8] functions (C001 to C008).<br />
(2) Assign the brake release signal (19: BRK), which is a brake-releasing command, to one of the<br />
intelligent output terminals [11] to [15] (C021 to C025). To output a signal when braking is abnormal,<br />
assign the brake error signal (20: BER) to an intelligent output terminal.<br />
When using the brake control function, you are recommended to select the sensorless vector control<br />
(A044 = 03) 0Hz-range sensorless vector control (A044 = 04) or V2 (A044=05)as the V/F characteristic<br />
curve selection that ensures a high starting torque. (See Section 4.2.18.)<br />
Settings required for the brake control function<br />
Item Function code Data or range of data Description<br />
Brake Control Enable<br />
b120<br />
00 Disabling the brake control function<br />
01 Enabling the brake control function<br />
Time to wait after the output frequency<br />
Brake Wait Time for<br />
has reached the release frequency until<br />
b121<br />
0.00 to 5.00 (s)<br />
Release<br />
the output current reaches the release<br />
current<br />
Brake Wait Time for<br />
Acceleration<br />
Brake Wait Time for<br />
Stopping<br />
Brake Wait Time for<br />
Confirmation<br />
b122<br />
b123<br />
b124<br />
0.00 to 5.00 (s)<br />
0.00 to 5.00 (s)<br />
0.00 to 5.00 (s)<br />
Mechanical delay after the release<br />
signal has been output until the brake is<br />
released<br />
Mechanical delay after the release<br />
signal has been turned off until the brake<br />
is applied<br />
Wait time longer than the delay after the<br />
release signal output until the release<br />
completion signal output from the brake<br />
is input to the inverter<br />
Frequency at which to output the brake<br />
release signal (*1)<br />
Brake Release Frequency<br />
0.00 to 99.99 or 100.0 to<br />
b125<br />
Setting<br />
400.0 (Hz)<br />
"0 x rated current" to<br />
Brake Release Current<br />
b126<br />
"2.0x rated<br />
Setting<br />
current" (%)<br />
0.00 to 99.99 or 100.0 to<br />
Braking frequency<br />
b127<br />
400.0 (Hz)<br />
*1 Specify a frequency higher than the start frequency (b082).<br />
*2 Note that setting a low current may not ensure sufficient torque at brake releasing.<br />
*3 :applied for 75 to 150kW<br />
Frequency at which to permit brake<br />
releasing (*2)<br />
Frequency at which to apply the brake<br />
for stopping the motor (*1)<br />
The inverter will trip with the braking error signal (BER) (E36: brake error) output in one of the following<br />
cases:<br />
1) The inverter output current brake remains below the brake release current, even after the release wait<br />
time (b121).<br />
2) During acceleration, the braking confirmation signal (BOK) is not turned on within the braking wait time<br />
(b124). During deceleration, the braking confirmation signal (BOK) is not turned off within the braking<br />
wait time (b124). Otherwise, the braking confirmation signal is turned off although the brake release<br />
signal is output.<br />
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