Smart Fans Replacement And Filter Cleaning; Figure 5-10: Smart Fans Location On Power Module Chassis - Delta M42U Operation And Installation Manual

5.4 Smart Fans Replacement and Filter Cleaning

M42/36/28U models are provisioned with processor-controlled "smart fans"
for cooling of the electronics. This section provides procedures for cleaning filters
associated with these fans, and instructions for field replacement of the fans.
The fans utilized have high reliability ratings and coupled with use of processor
controls provide a "smart" cooling system design with a long life. The system
features tachometer detection of a failed fan, and generates a "FAN-FAIL"
signal that is interfaced to the inverter control to trigger a FAN-FAIL alarm and
places the inverter in a power de-rate mode as required for safe operation.
Depending upon the model, fans are installed at two locations within inverter:
• Power Module (PM) compartment (-120, -121, -122)
Figures 5-10, 5-11 illustrates the fan locations.

Figure 5-10: Smart Fans location on Power Module chassis

Air Outlets
/ Smart Fans inside PM
79
Maintenance
Air inlet duct, 2 places