Owner`s manual

3.2.3 Air Intake Cleaning
Inspect the air intake and exhaust openings for blockage. Verify that air flows freely through the equipment. Clean
the air intake and exhaust openings with a vacuum and a soft brush.
3.2.4 AC Fan Replacement Procedure
Every five years, replace the two AC fans on the “Static Switch” front panel, (MGE UPS SYSTEMS part number 04-
22130). This is accomplish by removing all the DC and AC power to the unit by turning OFF the main AC and DC
source circuit breakers. Then perform the following steps.
◗ Remove the front panel from the “Static Switch” (panel with two fans), by using a #2 “Phillips” screw
driver to take out the four screws securing the panel to the “Receiver” rack. Unplug the two fan wires
at the “Static Switch” printed circuit board. Observe the position of the connectors on the fans and the
fan guard orientation. It is important that the new fans be installed in the same position as the old fans.
Remove the fans from the panel. Disconnect the wiring harness from the old fans, as it will be used
for the new fans.
◗ Install the new fans onto the panel, making sure the fan guard orientation is proper and the connector
location is correct. Install the wiring harness removed from the old fans.
◗ Install the fan assembly onto the “Static Switch”, making sure to plug fan’s back into the “Static Switch”
printed circuit board connectors. Secure the front panel in place by using the four “Phillips” head
screws previously removed.
◗ Power up the system in the normal way by making sure the “Display” panel ON/Standby switch is in
the “Standby” position, all of the power module circuit breakers are OFF before AC or DC power is re-
applied to the system. Apply the 48VDC and the AC (if applicable), then turn ON each of the DC circuit
breakers on the power modules, then activate the system by turning ON the ON/Standby switch on
the “Display” panel.
3.2.5 DC Fan Replacement Procedure
Every five years, replace the DC fan in each power modules (MGE UPS SYSTEMS fan part number 43-153645-00).
This is accomplished by removing the power module from the receiver. Then perform the following steps.
◗ Remove the front panel from the power module by removing the six “Phillips” head screws securing
the front panel to the chassis, the two screws securing the top cover to the front panel (6-32 x _”
“Phillips” head screws), and the two screws hold the DC circuit breaker to the front panel. It should
not be necessary to remove the top cover.
◗ Remove the front panel, being careful to unplug the fan from the printed circuit board.
◗ Observe the orientation of the fan wires and the fan guard so that it will appear like all other power
module front panels. Remove the fan from the front panel by removing the four screws holding the fan,
panel, and fan guard together.
◗ Install the new fan in the reverse order of disassembly. When installing the front panel onto the
chassis, care
must be taken to ensure the three LEDs project through the front panel. Install all ten flat
head screws.
◗ Make sure the circuit breaker on the front panel is in its OFF position.
◗ Install the module back into the receiver rack.
3.5 to 21 kVA N+1 Inverter
Maintenancepage 3 — 2