Moons' STF05-R - Choosing a Power Supply; Voltage; Current

15
Rev. 1.0
11/08/2017
STF-R/C Hardware Manual
400-820-9661
2.6 Choosing A Power Supply
The main considerations when choosing a power supply are the voltage and current requirements
of the application.
2.6.1 Voltage
The STF drive and motor is designed to give optimum performance between 24~48 Volts DC. Choosing
the voltage depends on the performance needed and diver/motor heating that acceptable and/or does
not cause a drive over-temperature. Higher voltage will give higher speed performance, but will cause
the drive to produce higher temperatures. Using power supplies with voltage outputs that are near the
drive maximum may signicantly reduce the operational duty cycle.
The STF03/06 drive extended range of operation voltage can be as low as 11VDC minimum to as
high as 53VDC maximum. When operation below 11VDC, the STF03/06 series will work unstable.
The supply input cannot go blow 11VDC for reliable operation, otherwise under voltage alarm will be
triggered. STF03/06 drive will stop working when this alarm is triggered.
The STF10 drive extended range of operation voltage can be as low as 18VDC minimum to as high as
75VDC maximum (18-53VDC for STF05 Drives). When operation below 18VDC, the STF05/10 series
will work unstable. The supply input cannot go blow 18VDC for reliable operation, otherwise under
voltage alarm will be triggered. STF05/10 drive will stop working when this alarm is triggered.
STF03/05/06
If a regulated power supply is used, and that is near the driver maximum voltage of 53VDC ,a voltage
clamp may be required to prevent the voltage over 53VDC which will occurs a overvoltage fault. When
using an unregulated power supply, make sure the no-load voltage of the supply does not exceed the
maximum input voltage 53VDC.
STF10
If a regulated power supply is used, and that is near the driver maximum voltage of 75VDC ,a voltage
clamp may be required to prevent the voltage over 75VDC which will occurs a overvoltage fault. When
using an unregulated power supply, make sure the no-load voltage of the supply does not exceed the
maximum input voltage 75VDC.
2.6.2 Current
When STF drives work with different motors, the recommended power supply output current
capacity under different supply voltage is shown in below table. The STF drive power supply
current is
lower than the the winding currents because it uses switching amplifiers to convert a
high voltage and low current into low voltage and high current.
The more power supply voltage
exceeds the motor voltage,the less current will be required from the power supply.
It is important to note that the current draw is significantly different at higher speeds depending
on the torque load to the motor. Estimat
ing how much current is necessary may require a good
analysis of the load to the motor
.
Drive Motor Voltage Current Drive Motor Voltage Current
STF03
STF05
STF06
AM8 24V above 1A
STF10
AM23
24V above 3A
AM11 24V above 1A 48V above 4A
AM14 24V above 1A 70V above 4A
AM17
24V above 1.5A
AM24
24V above 4.5A
48V above 1.5A 48V above 4.5A
AM23
24V above 3A 70V above 4.5A
48V above 4A
AM34
24V above 6A
AM24
24V above 4.5A 48V above 6A
48V above 4.5A 70V above 6A