Overview
Manuals
System Compatibility
Operating principle
Features:
- As the core internal power board of the high-voltage/high-current section of the PowerFlex 750 series frequency converters
- It receives low-voltage pulse timing signals from the converter's main control architecture
- It features high electrical isolation and can output sufficient transient high-pulse current to drive the gates of high-power frequency converter thyristors or IGBTs
This circuit board acts as a "power conversion and distribution center" in automated equipment. Its main function is to efficiently convert and regulate the input power, providing a stable and reliable low-voltage DC power supply to the inverter's core microprocessor, internal control bus, and various sensors.
It integrates a high-speed optocoupler isolation circuit, which can safely and accurately receive weak PWM pulse modulation signals from the main control PLC or inverter CPU, and linearly amplify them to convert them into high-power gate drive current that can directly trigger IGBTs or silicon controlled rectifiers (SCRs).
The PN-173122 PN-200959 Allen Bradley Inverter power supply board may still be available for purchase and support from Moore Automated Company beyond End-Of-Life (EOL) by the manufacturer (OEM).
Allen Bradley PN-173122 PN-200959 Inverter power supply board INFO(Datasheets), Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
Typically used in PowerFlex 700 standard drives with a power range of 15 kW to 110 kW. Because they control critical low-voltage power distribution and hardware firmware processing, failure of any one component usually results in the drive display going completely black or immediately triggering an overcurrent/undervoltage fault.
1.Multiple Outputs of the Switching Power Supply: The onboard switching power supply circuitry first receives high-voltage DC power from the inverter's DC main bus. Through closed-loop regulation by high-frequency high-voltage switching transistors and a pulse-width modulation (PWM) chip, the high-voltage power is converted into multiple electrically isolated low-voltage DC power supplies: +5V, +12V, ±15V, and +24V. These power supplies are then distributed to low-voltage control circuitry and independent drive channels.
2.Drive Pulse Isolation and Amplification: When the inverter is running, six low-amplitude, low-current three-phase sinusoidal pulse-width modulation (SPWM) signals from the upper-level CPU enter the board via pins. Onboard high-speed isolation optocouplers provide complete physical electrical isolation between the high-voltage and low-voltage signals. These pulses are then amplified by a dedicated drive chip (e.g., a gate integrated driver) to provide sufficient dynamic charge-discharge capability (gate charging current) for precise control of the rapid turn-on and turn-off of the IGBT power transistors.
3.Closed-loop feedback protection monitoring: Throughout the dynamic triggering process, the onboard Hall current detection interface or Vce saturation voltage drop monitoring circuit will perform millisecond-level rigorous sampling of the electrical state of each arm of the inverter bridge. Once an abnormal feedback signal exceeding the safety threshold (such as an output short circuit) is detected, the hardware protection circuit on the control board will bypass the CPU software response and directly pull down the gate trigger voltage to achieve hardware-level instantaneous shutdown protection, ensuring the continuous and stable operation of the entire industrial drive unit.
