Delta BLD-E1 brushless DC motor drive BLD-E1 Series - Manual (Page 80)

Chapter 4 Parameters| BLD-E1 Series
Revision May 2009, 00DE, V0.50 4-39
temperature, carrier frequency will be lowered to 10kHz, moreover, overload condition will be adjust,
e.g. Fc= 15kHz, rated output current= 50% * 55% = 82.5% and continues for 1 minute, the carrier
frequency (Fc) will be reduced to the default setting.
O verload Adjusting Graph
The control of maximum running speed differ upon PWM setting, therefore, carrier frequency
setting must be 27 times greater than the actual outputted frequency to attain best speed
control response.
For example, if Pr.00-12 setting is 2K, in order to attain best rotation speed control response,
the max. output frequency must be less than 74.07Hz. When number of motor poles is 5 , t he
rotation speed is controlled to around 888rpm; in this case, it is recommend to set carrier
frequency to 2K and speed command to 900rpm. When carrier frequency (Pr. 00-12) setting
is 6K or lower, please refer to the following chart for value of carrier frequency and rotation
speed: