External String Fuse; Smart Fans Replacement And Filter Cleaning - Delta M70A 263 Operation And Installation Manual

5.3 External String Fuse

According to different local regulations, if the external string fuse is required,
please contact Delta dealers.
H4+

5.4 Smart Fans Replacement and Filter Cleaning

M70A_263 is 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
• Inside the inverter compartment
XX: Fuse rating 20A / 25A / 30A
Figure 5-9: External String Fuse
63
Maintenance
H4-