ABB NSSM01 Dual channel assembly module

The incoming AC line is rectified (on the PCB A600 assembly) and optically coupled to the control section. The output of the opto-coupler is controlled by R4, R6 and R7. The output of the opto-coupler is connected to pin 9 of U14 (on the A100 board) and is compared to the 2.5 volts reference on pin 8. For normal operation, pin 11 is high (15 volts). When a phase loss or a low line occurs, pin 11 switches to low, causing the soft start pins of U15, U16, U17, and U18 to go low, thus disabling the PWMs and turning the phase loss LED on. The neutral loss circuit is comprised of R1, R2, R3, CR7, CR9, CR1 and U1. If the neutral line is disconnected, a voltage will develop across R5 causing U1 to disable U2. Therefore, the soft start pins of U15, U16, U17, and U18 will go low disabling the PWMs.

OVERVOLTAGE PROTECTION 

This feature allows the user to control the power supply's overvoltage trip point. The overvoltage control (R16) located on the front panel controls an adjustable 2.5 volt reference which is fed to the U14 on the A100 board. An attenuator on the A100 board also couples the DC signal to U14. When the signal of the attenuator is higher than the adjustable 2.5 volt reference, U14, drives a DC signal to the A900 board. U801 (SCR optocoupler) drives Q601, which crowbars the output of the power supply. At the same time, U14 pulls the (SS line) low, which shuts off the PWM.

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