ABB MicroFlex e150, User Manual

Page: 140 / 180

140 Technical data
Brake (X1)

Braking capacity
The braking capacity of the MicroFlex e150 can be calculated from the following
formula:
where the
Brake switching threshold
is 388 V. This gives the following typical values:

Brake resistor selection
The following calculations can be used to estimate the type of brake resistor that will
be required for the application. Some basic information is required to complete the
calculation. Remember to use the worst-case scenario for the application, to ensure
that the braking power is not underestimated. For example, use:
• The maximum possible motor speed.
• The maximum inertia.
• The minimum deceleration time.
• The minimum cycle time.
Description Unit All models
Nominal switching threshold V DC on: 388, off: 376
Nominal power
(10% peak power, r = 57
Ω
kW 0.25
Peak power
(10% peak power, r = 57
Ω
kW 2.7
Maximum brake switching current A
pk
10
Minimum load resistance Ω 39
Minimum load inductance µH 100
MicroFlex
e
150
catalog number
DC-bus
capacitance ( μ F)
Braking capacity (J)
115 V AC supply 230 V AC supply
E152A03... 560 34.7 12.5
E152A06... 1120 69.4 25
E152A09... 1680 104.2 37.6
E = — × DC bus capacitance × ( Brake switching threshold )
2
–
2
2 × Supply voltage
(
( )
) ¥
1
2