Choosing a power supply, Voltage selection, 8stm17 hardware manual – Applied Motion STM17C-3CE User Manual
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Choosing a Power Supply
The main considerations when choosing a power supply are the voltage and current requirements for the application.
Voltage Selection
The STM17 is designed to give optimum performance between 12 and 48 Volts DC. Choosing the voltage depends on
the performance needed and motor/drive heating that is acceptable and/or does not cause a drive over-temperature.
Higher voltages will give higher speed performance but will cause the STM17 to produce higher temperatures. Using
power supplies with voltage outputs that are near the drive maximum may significantly reduce the operational duty-
cycle.
The extended range of operation can be as low as 10 VDC minimum to as high as 55 VDC maximum. When operating
below 12 VDC, the power supply input may require larger capacitance to prevent under-voltage and internal-supply
alarms. Current spikes may make supply readings erratic. The supply input cannot go below 12 VDC for reliable opera-
tion. Absolute minimum power supply input is 10 VDC. If the Input supply drops below 10 VDC the low voltage alarm
will be triggered. This will not fault the drive, but the drive will likely power down.
Absolute maximum power supply input is 55 VDC at which time an over-voltage alarm and fault will occur. When using
a power supply that is regulated and is near the drive maximum voltage of 55 VDC, a voltage clamp may be required to
prevent over-voltage when regeneration occurs. The RC-050 Regeneration Clamp is recommended for the STM17 in this
situation. When using an unregulated power supply, make sure the no-load voltage of the supply does not exceed the
drive’s maximum input voltage of 55 VDC.
The charts below show the heat output, in watts, of the drive at various speeds and voltages. See the section on “Duty
Cycle Heating” in the Reference Materials for more information.
STM17S-1AN Wattage vs Speed
1.8 Amps @ Ambient of 40°C
80 x 80x 6(mm) Aluminum Plate
0
10
20
30
40
50
60
0
10
20
30
40
50
Speed(RPS)
Watts
12V Watts
24V Watts
48V Watts
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STM17 Hardware Manual
920-0034 rev A
9/30/2010