Advanced Program Group (continued)
55
A425 [DC Brake Level]
Related Parameter(s): P107, A418
Defines the maximum DC brake current, in amps, applied to the motor when P107 [Stop Mode] is set to either “Ramp” or “DC Brake”.
Values
Default
Drive Rated Amps
⋅
0.05
Min/Max:
0.0/(Drive Rated Amps
⋅
1.8)
Display:
0.1 Amps
ATTENTION:
If a hazard of injury due to movement of equipment or material exists, an auxiliary mechanical braking
device must be used.
ATTENTION:
This feature should not be used with synchronous or permanent magnet motors. Motors may be
demagnetized during braking.
A427 [DB Resistor Sel]
Related Parameter(s): A428
Stop drive before changing this parameter.
Enables/disables external dynamic braking. This parameter applies only to Frame C drives.
Setting
Min/Max
0
“Disabled”
1
“Normal RA Res” (5% Duty Cycle) - Refer to Table B.C on page B-2
2
“No Protection” (100% Duty Cycle)
3
“% Duty Cycle” Limited (1% – 99% of Duty Cycle) - see A428
The drive is able to provide full braking indefinitely. Braking power is limited by the external DB resistor. When this parameter is set to 1 “Normal
RA Res” and an appropriate RA resistor is used (see selection Table B.C), the drive provides calculated resistor overload protection. However,
the drive cannot protect against a brake IGBT failure.
ATTENTION:
A risk of fire exists if external braking resistors are not protected. The external resistor package must be
self-protected from over temperature or the protective circuit shown in Figure B.3 on page B-7, or equivalent, must be supplied.
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