Determining the braking power

Continuous braking power/peak braking power

Regardless of the DC link voltage, the MOVIDRIVE^® MDR60A.. regenerative power supply provides the following maximum braking power when used as a brake module. A stable line supply is an essential requirement to ensure that energy is recovered and fed back into the supply system.

If there is a power failure or disruption in the supply system, the regenerative power supply cannot be operated and energy recovery is therefore impossible.

MOVIDRIVE^® MDR60A0150-503-00 regenerative power supply: used as brake module
Cyclic duration factor (CDF) CDF = Cyclic duration factor of the brake module in relation to a cycle duration T_D ≤ 120 s	Maximum braking power (P_{B_max})
100%	22 kW
75%	28 kW
60%	32 kW
50%	35 kW
< 40%	37 kW

The ratio between the percentage cyclic duration factor (CDF) and the power-applied hours (t_ein) within a cycle duration (T_D) of 120 s is as follows:

The following maximum braking power is available for the respective cyclic duration factor (CDF) ranges:

Cyclic duration factor (CDF) range	Maximum braking power (P_{B_max})
< 40%	P_{B_max} = 37 kW
40% to < 100%	P_{B_max} = 47.7 kW - CDF × 15 kW/58.3%
100%	P_{B_max} = 22 kW

INFORMATION

Destruction of the regenerative power supply.

Do not exceed the maximum braking power of 37 kW (peak braking power). Even short overloads can result in the destruction of the regenerative power supply. An overload of the regenerative power supply must be prevented by adjusting the emergency stop ramps of the connected inverters.

Example:

t_ein= 80 s

The following figure shows the calculation example:

t_ein	80 s braking time
t_p	= 40 s pause time
T_D	= 120 s cycle duration