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General| Brand | Centralion |
|---|---|
| Model | 400VA |
| Category | UPS |
| Language | English |
Main relay for mode switching; transformer for inverter, booster, charger.
Booster and Buck relays adjust output voltage based on line conditions.
Processes input signals and houses the Central Process Unit.
Generates essential +5V and +12V DC power supplies for the system.
Traditional linear charging circuit using LM317 for battery charging.
Push-pull circuitry drives the inverter transformer coil.
Contains the UPS display device with an LED and a switch.
Power source during battery mode; types vary by specific UPS model.
Detailed steps for initiating UPS operation without AC power.
Steps for starting the UPS when connected to AC power.
Manages UPS shutdown from battery mode due to low voltage.
How the LM317 regulator sets battery charging voltage.
Current limiter process using R31, Q09, Q08 to prevent battery damage.
CPU's CHG-OFF signal turns off the charger in battery mode.
Methods for detecting line voltage quality using waveform and RMS values.
Zero crossing detection minimizes phase difference during mode switching.
How the zero crossing signal is generated and sent to the CPU.
Push-pull inverter active in battery mode, driven by CPU-controlled transistors.
MOSFET gates driven by transistors; C24/R83 reduce energy spikes.
Pulls down output voltage when Inverter MOSFETs are OFF during zero Volt intervals.
Q22 activation by CPU's CLAMP-OFF signal controls the clamp circuitry.
Defines functions for each pin of the NEC µPD78F9116A CPU.
Hardware reset circuit for the CPU implemented on power-up.
CPU pin 15 controls main relay RY01 for line/battery mode switching.
CPU pin 12 controls the booster relay (RY02) for boost mode.
CPU pin 14 controls the buck relay (RY03) for buck mode.
Describes the front panel LED controlled by the CPU.
Buzzer controlled by CPU pin 2 for audible alerts.
ON/OFF button for controlling UPS power states.
Senses output current via CT01 for CPU monitoring.
Calculates VA (line mode) and Wattage (battery mode) from current/voltage.
ZD03 clamps voltage spikes to protect the rectifier.
D-type connector pin definition for communication.
Components and function of the RS232 serial communication interface.
Critical safety warnings and preparation steps before troubleshooting.
Steps for initial visual check of components and connections.
Verifies MOSFETs, CPU voltage, and clock signals for battery mode issues.
Checks power supplies and tests transistors, diodes, and regulators.
Verifies power connection, main relay activity, and input fuse status.
Checks main relay, rectifier, and zero crossing signal for line mode faults.
Interprets continuous buzzer beeps and fault LED lights.
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