NEC NP-NC900C-A, Руководство по обслуживанию

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[5] Detect rule:
Hardware & Software Failure Detection
- By hardware, the hardware design will cut off the power of ballast to protect system immediately.
- By software, the Slave MCU should polling all the FAN status via the P00~P04 of PCA9555 (IC338), if
detect any failure that come from FAN driver IC, the Slave MCU will assert the ALERT signal, then go back
to the main loop processes of Slave MCU.
Lamp Thermostat Detection
The Slave MCU polling the signal status from the P13 of PCA9555 (IC27), the status ‘1’ indicates failure and ‘0’
indicates normal.
Lamp Interlock Detection
The Slave MCU polling the signal status from the P15 of PCA9555 (IC27), the status ‘1’ indicates failure and ‘0’
indicates normal.
Lamp Door Detection
The Slave MCU polling the signal status from the P16 of PCA9555 (IC27), the status ‘1’ indicates failure and ‘0’
indicates normal.
Notch Filter Detection
The Slave MCU polling the signal status from the P17 of PCA9555 (IC27), the status ‘1’ indicates failure and ‘0’
indicates normal.
* Software Design Notes *
- The Slave MCU should polling these statuses of “Lamp Thermostat Detection”, “Lamp Interlock
Detection”, “Lamp Door Detection” and “Notch Filter Detection” by order.
- When Slave MCU detected one of above mentioned failure, the Slave MCU will assert the
ALERT signal.
- There is hardware protection design to cut off the power of ballast 1 and ballast 2 when system
occur any one of above mentioned failure.