Brushless DC Motor Drive
｜
BLDH1500RA
5
ICAN
Nov 2022
3.5 Speed port description
This port feeds motor rotate speed and outputs in form of frequency, 1000rpm=1000Hz, 500rpm=500Hz; Notice that the precision
of feedback depends on correct poles setting
：
1) Closed loop mode : accurate feedback;
2) Open loop mode : 4 poles motor rotate speed feedback in default which is underlying setting and cannot be modified by
customer.
4. Current limit adjustment P-sv
The current limit adjustment knob P-sv can limit the peak value of motor phase current, thereby limiting the calorific value of
wingding and protecting the motor.
Customers can use the current limit value between scale 3 and scale 10, when adjusting it to the maximum 10, the phase line limit
current is 13A.
Notice: If P-sv is adjusted to 0, the motor will not rotate, and if there is a speed adjustment value at this time, it will alarm
and be locked-rotor.
5. Speed setting via external signal
When switching to external analog control mode, the built-in potentiometer RV must be closed.(RV knob is rotated anticlockwise
to the limit position)
When multiple speed setting signal exist at the same time, the signal priority is as below :
Frequency > PWM > Internal Potentiometer > SV
Below pictures are linearity test curve of external signal speed setting :
（
1KHz
）
duty ratio value range
：
2% ~ 95%
；
(50%duty ratio) frequency speed setting
：
X Hz = X rpm
Duty ratio %
External analog voltage (V)
Rotating speed
Rotating speed
