InFocus MaxFlight MT3000B ELECTRIC, Owner'S Manual

Page: 82 / 121

Close out VNC to the on-board computer. You are now ready to start the Monster Truck
program from the main command console.
CHAPTER 6 – Time Replacement Items
6-1 REPLACEMENT OF INVERTER PARTS
The inverter consists of many electronic parts such as semiconductor devices. The following
parts may deteriorate with age due to their structure or physical characteristics, leading to
reduced performance or failure of the inverter. For preventative maintenance, the parts must
be changed periodically.
6-1A COOLING FAN
The cooling fan cools heat generating parts such as the main circuit semiconductor devices.
The life of the cooling fan bearing is usually 10,000 to 35,000 hours. Hence, the cooling fan
must be changed every 2 to 3 years if the inverter is run continuously. When unusual noise
and/or vibration is noticed during inspection, the cooling fan must be changed immediately.
Figure 1
Fan replacement
Removal
3) Push the catches on both sides and pull the fan casing down.
4) Disconnect the fan power connector.
Reinstallation
3) Reconnect the fan power connector.
Push the fan casing up until it locks into place.
6-1B SMOOTHING CAPACITORS
A large-capacity aluminum electrolytic capacitor is used for smoothing the DC in the main
circuit, and an aluminum electrolytic capacitor is also used for stabilizing the control power
in the control circuit. Their characteristics are adversely affected by ripple current, etc.
When the inverter is operated in an ordinary, air-conditioned environment, change the
capacitors about every 5 years. When 5 years have elapsed, the capacitors will deteriorate
more rapidly.
Check the capacitors at least every year (less than six months if their life will be expired
soon).
Check the following:
1.) Case (side faces and bottom face for expansion)
2.) Sealing plate (for remarkable warping and extreme cracks)
3.) Explosion-proof valve (for excessive valve expansion and operation)