GE AV-300I - Braking Unit Protection (BU Protection); Enabling of the Internal Braking (ENABLE BU); Figure 1.3.2.8.1: Braking Unit Function

GEH-6641E
—————— Function Description ——————
38
Ch.1
1.3.2.8 Enabling of the Internal Braking (ENABLE BU)
External
Resistor
I
2
t
logic
BU
ALARM
BU disable
Drive alarm
T
External
resistor
BU resistance
BU Control
BU res OL factor
BU res cont pwr BU res OL time
Figure 1.3.2.8.1: Braking Unit Function
1.3.2.8.1 Braking Unit Protection (BU Protection)
It controls the I
2
t Braking Unit protection function.
When the protection becomes active, it is possible to generate an alarm condition.
According to the different cases it is possible to use the device internal IGBT (Internal-External).
Overload factor = overload Power/ rated Power
Example:
DB resistance = 50 Ω
Resistor continuos Amp rating = 15A
Rated for 5 X Amps for 15 secs
Resistor short time overload rating = 5 time quarter minute (5 time continuous amps for 15 secs)
Set parameters:
Bu resistance = 50 I
2
* R
Bu res cont pwr = 11.25 kW (15
2
* 50)
Bu res OL time = 15 secs
Bu res OL factor = 25 (power = 12 R, 5 times overload current squared = 25)
STARTUP
Startup config
BU protection
BU control
BU resistance
BU res cont pwr
BU res OL time
BU res OL factor