TM 5-3895-374-24-1
Options
Braking power calculation
- High inertia machine, non-driving load
Braking torque on deceleration Cb = J Dw N m,
Dt
J :total moment of inertia referred to the motor shaft in kg m2,
Dw: speed difference in rad/s,
Dt: deceleration time in seconds
Instantaneous braking power Pb= Cb w in W
Average braking power during deceleration Pbd = 0,5 Cb Dw in W
Average braking power during one cycle Pbm = Pbd t in W
T
t braking time in s, T. time of one cycle in s
speed
- Driving load, continuous operation of unspecified duration
Braking is treated as continuous braking Pb = Pbm = Cb w in W,
Cb braking torque in N m,
w speed in rad/s
CAUTION whatever the application, the instantaneous braking power necessary must be < 1,5
the rated power of the speed controller
Braking resistance selection
The braking resistance is defined by its ohmic value and power dissipation capacity
Ohmic value of the resistance
Reference ATV-452
U40S
075(M)(N)
U55(N)
U40M
D18N
U55M
015M
D55
D75N
075
U15(N)
U75(N)(S)
D15(N)
D22(N)
U75M
037
D90N
D90
U22(M)(N)
D11(N)
D30S
D30(N)
D11M
D55N
U30
D15S
D37N
U40(N)
D55S
Minimum value
100
47
27
22
15
10
8
7
5
4
of the resistance (W)
Power of the resistance
rated Pn power that can be dissipated continuously, it must be greater than the average braking
power Pbm,
- maximum Pmax power that can be dissipated over a short period on intermittent duty, it must
be greater than braking power Pb
(page 3-215)
