10
Rev. 1.0
20/07/2020
SSDC-ECX-H/J Hardware Manual
400-820-9661
2.4 Choosing a Power Supply
The main considerations when choosing a power supply are the voltage and current requirements
for the application.
2.4.1 Voltage
The SSDC drive is designed to give optimum performance between 24 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 RS driver to produce higher temperatures. Using power supplies with voltage outputs
that are near the drive maximum may significantly reduce the operational duty-cycle.
SSDC06/10
For the SSDC06/10 drive, the extended range of operation can be as low as 18 VDC minimum to
as high as 75 VDC maximum. When operating below 18 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 18 VDC for reliable operation. This
will not fault the drive. Absolute maximum power supply input is 75 VDC at which point an over-
voltage alarm and fault will occur. When using a power supply that is regulated and is near the
drive maximum voltage of 75 VDC, a voltage clamp may be required to prevent over-voltage when
regeneration occurs. 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 75 VDC.
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