Check the combiner fuses if the power generation of inverter is abnormal using
the following procedure:
1. Check “Power meter/string monitoring” page on the LCD display, to determine
if any string current measurement is zero, which will most probably indicate
a blown fuse. (Figure 5-12)
2. Switch AC and DC power off and wait until LCD display turns off.
3. To access the wiring box, use procedure found in Section 5.1.1
4. Based on step 1, check the corresponding fuse locations by pulling out the
fuse holder (Figure 5-11) and checking continuity of the fuse.
5. Replace the fuse if necessary.
6. Re-install the WB cover, using the procedure found in Section 5.1.2
Figure 5-12: String monitor
1 :
2 :
3 :
1.6
0.0
1.5
4 :
5 :
6 :
1.6
1.7
1.7
IDC1 (A)
1 :
2 :
3 :
1.4
1.6
1.5
4 :
5 :
6 :
1.6
0.0
1.6
IDC2 (A)
Fuse open
or blown
Fuse open
or blown
M80/60 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:
• Wiring Box (WB) compartment (-120, -122)
• Power Module (PM) compartment (-120, -121, -122)
Figures 5-13, 5-14, 5-15 illustrates the fan locations.
5.4 Smart Fans Replacement and Filter Cleaning
94
Maintenance
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