Optidrive E3 Set-up Guide
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Dynamic Braking
Dynamic Braking
Dynamic braking is enabled by parameter P-34.
Setting
Description
Explanation
0
(Default)
Disabled
1
Enabled with software
protection
Enables the internal brake chopper with software protection for
the 200W continuous rated resistor.
2
Enabled without software
protection
Enables the internal brake chopper without software protection.
An external thermal protection device should be fitted.
3
Enabled with software
protection
As setting 1, however the brake chopper is only enabled during a
change of frequency set-point and is disabled during constant
speed operation.
4
Enabled without software
protection
As setting 2, however the brake chopper is only enabled during a
change of frequency set-point and is disabled during constant
speed operation.
Dynamic braking is used dissipate any regenerated energy, usually from an inertia load, when it is slowed
down and stopped. The regenerated energy is dissipated as heat in a braking resistor.
The software protection when enabled on the Invertek 200W (size 2 & 3) or 500W (size 4) internally mounted
braking resistor (OD-BR100-IN & OD-BRES4-IN) will trip the drive on
0
00
0L
LL
L~
~~
~B
BB
BR
RR
R
if the resistor is overloaded. The
OD-BR100-IN and OD-BRES4-IN are fail safe resistors and do not require an external thermal overload device.
If the software protection is disabled and an external braking resistor used, a thermal protection device
(thermal overload) should be used to protect the resistor from overheating and causing a potential fire hazard.
The thermal overload should remove input power from the drive.
Some braking resistors may not require a thermal protection device as they are designed to be failsafe in the
event of an overload. Please consult the resistor manufacturer for details on the resistor being used.
Connect the braking resistor between the
BR
and
+DC
power terminals.
NOTE:
Dynamic braking is not available on Optidrive E3 size 1 drives.
WARNING:
Braking resistors can reach high temperatures. Locate the braking resistors so that damage cannot result. Use
cable having insulation that can withstand high temperatures.