Title: +038=360.012-#####._06-BA-ESR NI-DV Controller Nicotra Gebhardt - Operating Instruction.pdf
o At motor speeds lower than 50% of rated speed, switchingfrequency is changed to 8 kHz5.4. Braking powerThe electronics within NI-DV can as a starting point supply braking power corresponding to its own consumption. It is expected that an air flow capable of maintaining typically up to 30% of nominal fan speed can be braked by this function. If greater braking power is required, an internal braking chopper capable of supplying braking power for brief periods can be connected. If maximum braking power is required, an external braking chopper capable of supplying up to 1/3 of nominal NI-DV power can be connected.5.5. Fire modeFire mode designates a function in which NI-DV is kept operating by an emergency program which disables the alarm monitor.Fire mode designates a function in which NI-DV is kept operating by an emergency program which disables the alarm monitor.