McCain ATC eX2 NEMA, Руководство пользователя

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McCain ATC eX2 NEMA Controller
– User Manual
9
Version 1.0
2.5 Internal Construction / Sub-Assemblies:
This section briefly describes the construction and operation of each sub-assembly of the ATC eX2
NEMA controller, indicating the interface connectors on each board and the relationship to the other
boards.
For a more detailed understanding of a specific module or sub-assembly please refer to the proper
appendices.
Appendix A Contains all schematics.
Appendix B Contains the assembly drawings.
Appendix C Contains the bills of materials.
2.5.1 Power Supply Sub-Assembly (M45891).
This sub-assembly consists of a switching power supply module with a large can back up capacitor. It
provides the DC voltages to the Control Signals board (M66450A) and receives the AC power from such
board. The DC voltages provided are +24VDC, +12VDC and +5VDC.
2.5.2 Control Signals Board Sub-Assembly (M66450A).
This board generates the POWERDOWN, POWERUP and LINESYNC signals and along with the DC
voltages received from the power supply assembly. It also sends the signals and voltages to the other
sub-assemblies through the corresponding harness.
The board also has a circuit to define the trip and recover window for the AC power input; this is a factory
set adjustment and should not be changed. The default is: 85VAC for power down and 90VAC for power
up.
This sub-assembly contains the below circuits and connectors:

A five positions header (AC INPUT) for receiving the AC power input.***

A three positions header (FUSE/SWITCH) for connecting the AC+ line to the fuse and switch
located on the front panel.

A three positions header (AC OUTPUT) for providing the AC power to the power supply sub-
assembly (M45891).

An AC filter circuit at the AC power input.

A zero-crossing detector.

An AC hysteresis trip/recover adjustment (POT1).

Circuitry for generating the POWERDOWN, POWERUP and LINESYNC signals.

A five positions header (DC INPUT) for receiving the DC voltages from the power supply sub-
assembly (M45891).