19
rotation, and setting EXST low (short circuit with ground) allows rotation.
(7) External speed control input port ADC-IN can adjust signal. The port voltage is 0 ~ DC3.3V. If
you want to input other speed control signals, the corresponding signal converters need to be
connected for correct operation.
External speed
control signal
Definition
Remark
0
0-3. 3V external
speed control
The voltage signal of 0 ~ 3.3V can be directly connected to the
ADC-IN port
1
0-5V external
speed control
Special conversion module from 0 ~ 5V to 0 ~ 3.3V is required
2
0-10V external
speed control
Special conversion module from 0 ~ 10V to 0 ~ 3.3V is required
3
4-20mA external
speed control
Special conversion module from 4 ~ 20mA to 0 ~ 3.3V is required
4
0-10KHz external
speed control
Special conversion module from 0 ~ 10KHz to 0 ~ 3.3V is
required
Table 5-1 List of external speed control signal
Note:
the external control speed can only be adjusted between 0-maximum speed. Due to the
error of AD, the actual minimum speed will be greater than 0.1 rpm, and the actual maximum speed
will be less than the theoretical maximum speed.
5.2 Maximum Speed Setting
When the motor stops, set the maximum speed through RS232 / RS485, please refer to the
command of 0x05 in Chapter 4.2.
When the instrument leaves the factory, the suitable maximum speed will be preset according to
the optional pump head/pump tube. The user does not need to set.
