Parameters and firmware blocks203Group 48 BRAKE CHOPPERConfiguration of an internal braking chopper.48Firmware block:BRAKE CHOPPER(48)This block configures the brakingchopper control and supervision.48.01 BC ENABLE FW block: BRAKE CHOPPER (see above)Enables the braking chopper control.Note: Before enabling the braking chopper control, ensure the braking resistor is installed and theovervoltage control is switched off (parameter 47.01 OVERVOLTAGE CTRL). The drive has a built-inbraking chopper.(0) Disable Braking chopper control disabled.(1) EnableTherm Enable the braking chopper control with resistor overload protection.(2) Enable Enable the braking chopper control without resistor overloadprotection. This setting can be used, for example, if the resistor isequipped with a thermal circuit breaker that is wired to stop the drive ifthe resistor overheats.48.02 BC RUN-TIME ENA FW block: BRAKE CHOPPER (see above)Selects the source for the quick run-time braking chopper control.0 = Braking chopper operation is prevented. In other words, although the braking chopper has beenenabled with parameter 48.01 and DC voltage rises over the activation level, the braking chopperremains inactive.1 = Braking chopper is always active, ie, the braking chopper starts switching, if the DC voltagereaches the activation level (even if the drive is not running).This parameter can be used for programming the chopper control to function only when the drive isoperating in the generating mode. By default this parameter is connected to parameter 06.01 STATUSWORD1 bit3 (RUNNING).Bit pointer: Group, index and bit48.03 BRTHERMTIMECONST FW block: BRAKE CHOPPER (see above)Defines the thermal time constant of the braking resistor for overload protection.0…10000 s Braking resistor thermal time constant.48.04 BR POWER MAX CNT FW block: BRAKE CHOPPER (see above)Defines the maximum continuous braking power which will raise the resistor temperature to themaximum allowed value. The value is used in the overload protection.0…10000 kW Maximum continuous braking power.BRAKE CHOPPER 35TLF10 2 msec (11)48.01 BC ENABLE[ Disable ]< 48.02 BC RUN-TIME ENA[ TRUE ]48.03 BRTHERMTIMECONST[ 0 s ]48.04 BR POWER MAX CNT[ 0.0000 kW ]48.05 R BR[ 0.0000 Ohm ]48.06 BR TEMP FAULTLIM[ 105 % ]48.07 BR TEMP ALARMLIM[ 95 % ]
