External String Fuse; Smart Fans Replacement And Filter Cleaning - Delta M50A 261 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 and M50A 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 system features 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.
M70A and M50A has one fan tray for power module cooling and two internal fans
for inside air circulation.
Figures 5-10 illustrates the PM fan locations.
Figures 5-11, 5-12, 5-13 illustrates the internal fan 1.
Figures 5-14, 5-15, 5-16 illustrates the internal fan 2.
Periodic fan and filter cleaning is required to insure long life and reliability.
- The time period between cleanings depends on the quality of the environment.
- Under normal duty use, Delta recommends smart fans and filters be cleaned
every 4 months
- For very dusty locations, it may be necessary to clean the fans and filters
quarterly or monthly.
XX: Fuse rating 20A / 25A / 30A
Figure 5-8: External String Fuse
ATTENTION
63
Maintenance
H4-