Air Flow Detector
The fans have a speed detection (opto-coupler device) for the air flow detection.
The opto-coupler device sends a signal to the PCC card.
Air Flow Monitoring
The status of the fan is scanned cyclically to determine an eventual fault. If a fault occurs during this
scanning the machine is powered OFF, this fault is displayed on the control panel and stacked in the PCC
card. After a 10-seconds wait, the machine is powered ON again.
The same operation can be done three times . After three times the machine stays power OFF.
Opto-Coupler Device Output
AFD 1 and AFD 2
────
┌─────┐
┌─────┐
┌─────┐
5V │
│
│
│
│
│
│
──── ────┘
└─────┘
└─────┘
└────
│
11 ms
│
│%─────────5│
AFD 0
────
─────────┐
┌───────────┐
5V │
│
│
│
────
└───────────┘
└─────
│
22 ms
│
│%─────────────────────5│
Chapter 10. Power System
10-27
Содержание 3745 Series
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