14
Rev. 1.0
09/06/2015
MSSTB-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 MSSTB 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 signicantly reduce the operational duty-
cycle.
The MSSTB drive extended range of operation can be as low as 18VDC minimum to as high as
75VDC maximum. (18-53VDC for MSSTB05 Drives) When operation below 18VDC, the MSSTB
series will work unstable. The supply input cannot go blow 18VDC for reliable operation, otherwise
under voltage alarm will be triggered. MSSTB drive will stop working when this alarm is triggered.
MSSTB05
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 over-voltage
fault. When using an unregulated power supply, make sure the no-load voltage of the supply does
not exceed the maximum input voltage 53VDC.
MSSTB10
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 over-voltage
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 MSSTB drives work with different motors, the recommended power supply output current
capacity under different supply voltage is shown in below table. The MSSTB drive power supply
current is lower than the the winding currents because it uses switching ampliers 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 signicantly different at higher speeds depending
on the torque load to the motor. Estimating how much current is necessary may require a good
analysis of the load to the motor.
Drive Motor Voltage Current Drive Motor Voltage Current
MSSTB05
AM11 24V above 1A
MSSTB10
AM23
24V above 3A
AM14 24V above 1A 48V above 4A
AM17
24V above 1.5A 70V above 4A
48V above 1.5A
AM24
24V above 4.5A
AM23
24V above 3A 48V above 4.5A
48V above 4A 70V above 4.5A
AM24
24V above 4.5A
AM34
24V above 6A
48V above 4.5A 48V above 6A
70V above 6A
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