Operating Basics
2–2
VX1411 MainFrame Instruction Manual
The On/Standby switch on the top-left corner of the front panel applies DC
voltages to the mainframe. The switch is a momentary contact switch. The
switch is lighted when DC voltages are applied to the mainframe.
Figure 2–3 shows the rear view of the standard VX1411 Mainframe.
The AC power connector is located on the bottom left side on the rear of the
mainframe. The AC fuse holder is located just above the power connector.
The chassis ground screw (if installed) can be used to connect multiple
mainframes to a common ground point.
The fan filter is located on the back of the mainframe. The filter slides easily into
the mainframe; there is no need to remove any covers to replace or clean the fan
filter.
Fan Speed Control
The Fan Speed switch controls the speed of the system cooling fans. When the
switch is set to the low position, the fans are set to a low speed to reduce fan
noise. When the switch is in the FULL position, the fans operate at full speed.
To maintain appropriate power supply cooling, set the fan speed switch
according to Figure 2–2. For high module loads and high ambient temperatures,
set the fan speed switch to full.
Ambient temperature (
_
C)
500
400
300
200
100
0
0
10
20
30
40
Full fan speed
Low or full fan
speed
Output
power (W)
50 55
60
Figure 2–2: Power output fan Vs temperature for the 2 fan speeds
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