Hitachi SJ7002 Series Instruction Manual page 102

Func.
Code Description
A051 DC braking enable
A052 DC braking frequency setting
Frequency at which DC braking activates during decel.
A053 DC braking wait time
The delay after reaching the DC braking frequency, or
[DB] signal, before DC braking begins
A054 DC braking force during deceleration
Variable DC braking force
A055 DC braking time for deceleration
Sets the duration for DC braking during decel
A056 DC braking / edge or level detection
for [DB] input
A057 DC braking force for starting
Variable DC braking force
A058 DC braking time for starting
Sets the duration for DC braking before accel.
A059 DC braking carrier frequency setting
Clearwater Tech - Phone: 800.894.0412 - Fax: 208.368.0415 - Web: www.clrwtr.com - Email: info@clrwtr.com
You can configure DC braking to initiate in one of two ways:
1. Internal DC braking – Set A051=01 to enable internal braking. The inverter automatically
applies DC braking as configured (during stopping, starting, or both).
2. External DC braking – Configure an input terminal with option code 7 [DB] (see
nal Signal for DC Injection Braking" on page 4–19
although this setting is ignored when a [DB] input is configured. The DC braking force
settings (A054 and A057) still apply. However, the braking time settings (A055 and A058)
do not apply (see level and edge triggered descriptions below). Use A056 to select level or
edge detection for the external input.
a. Level triggered – When the [DB] input signal is ON, the inverter immediately applies
DC injection braking, whether the inverter is in Run Mode or Stop Mode. You control
DC braking time by the duration of the [DB] pulse.
b. Edge triggered – When the [DB] input transitions OFF-to-ON and the inverter is in Run
Mode, it will apply DC braking only until the motor stops... then DC braking is OFF.
During Stop Mode, the inverter ignores OFF-to-ON transitions. Therefore, do not use
edge triggered operation when you need DC braking before acceleration.
CAUTION: Be careful to avoid specifying a braking time that is long enough to cause motor
overheating. If you use DC braking, we recommend using a motor with a built-in thermistor
and wiring it to the inverter's thermistor input (see
25). Also refer to the motor manufacturer's specifications for duty-cycle recommendations
during DC braking.
Keypad
Name/
SRW
OFF
ON
DON
EDGE
LEVEL
"Thermistor Thermal Protection" on page 4–
Range and Settings
OPE
00
Disable
0 1
Enable
02
Brake at set frequency only
0.00 to 60.00 (Hz)
0.0 to 5.0 (seconds)
0. to 80. (%)
0.0 to 60.0 (seconds)
00
Edge detection
0 1
Level detection
0. to 80. (%)
0.0 to 60.0 (seconds)
0.5 to 15 (kHz) up to SJ700-1500;
0.5 to 3.0kHz for models SJ700-
1850 to SJ700-4000
SJ700 Inverter
2
for more details). Leave A051=00,
Defaults
FEF2 FUF2 FF2
FE2 FU2 F2
(EU) (USA) (Jpn)
00 00 00
0.50 0.50 0.50
0.0 0.0 0.0
0. 0. 0.
0.0 0.0 0.0
01 01 01
0. 0. 0.
0.0 0.0 0.0
3.0 3.0 3.0
3–19
"Exter-
Run
Mode
Edit
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