GEFRAN-SIEI ARTDrive Vector V2 Series - Page 65

ARTDrive V2 series - Instruction Manual Chapter 4 Wiring Procedure • 65
T
BRL
Maximum braking time in condition of limit operating
cycle (braking power = P
PBR
with typical triangular
profile*)
T=2 = [s]
BRL
E
BR
P
PBR
* triangular power profile occurs when stopping an inertia load on a speed
ramp profile
Figure 4.8.2.1: Limit Operating Braking Cycle with Typical Triangular Power Profile
T
CL
n,P
P
PBR
T
BRL
n
E
BR
t
T
CL
Minimum cycle time in condition of limit operating cycle
(braking power = P
PBR
with typical triangular profile)
T = T = [s]
CL BRL
P
P
PBR
NBR
1
2
The BU overload alarm occurs if the duty cycle exceeds the maximum data
allowed in order to prevent possible damage to the resistor.
Resistor model: Standard resistor data
Example code: MRI/T900 68R
MRI = resistor type
900 = rated power (900 W)
T= with safety thermostat
68R = resistor value (68 Ω)
NOTE! The suggested match of resistor-model and inverter-size, allows a braking stop
at rated torque with duty cycle T
BR
/ T
C
= 20%
Where: T
BR
= Braking time
T
C
= Cycle time