PAGE 2.2 - 10 OPERATION MARK IV HD J2 TAMPER
REVISED 10 -2020 JUPITER II BULLETIN 5082505
2.2
2.2.1 Jupiter II Control System
2.2.1.8 Jupiter Diagnostics Overview
1. The diagnostic screens incorporated into Jupiter II can be used to troubleshoot electrical
systems and electrical components that are controlled or monitored by Jupiter. In some
applications, not all components and systems on the machine can be checked or
monitored by Jupiter.
2. When the computer detects a fault in the Jupiter network on the machine, it will generate
an alarm message that appears in the alarm panel on the computer monitor. The type of
alarm message will determine the most practical troubleshooting procedure.
3. If an alarm message would appear such as "Low Fuel", then the first thing to check would
be the fuel level in the fuel tank. If the fuel tank is not empty, then the Jupiter diagnostic
screens would be used to check for short circuits, voltage problems, etc.
4. If an alarm message would appear such as "Output Module Open Circuit Detected", then
the first thing to check would be the diagnostic screens to determine which module has the
open circuit and what is causing the open circuit at that module. In most cases, when a
fault occurs that can be checked by the diagnostic screens, the network diagnostic screen
will automatically be displayed on the monitor. The operator can then select the detail view
of the module on which the fault has occurred and determine where the open circuit is.
2.2.1.9 Pulse Width Modulation (PWM)
1. Several functions on the machine are controlled using Pulse Width Modulation (PWM).
2. Pulse Width Modulation (PWM) is a method of controlling the amount of power to a load
without having to dissipate any power in the load driver.
3. As an example, imagine a 10W light bulb load supplied from a battery. In this case the
battery supplies 10W of power and the light bulb converts this 10W into light and heat. No
power is lost anywhere else in the circuit. If we wanted to dim the light bulb so it only
absorbed 5W of power, we could place a resistor in series which absorbed 5W and then
the light bulb could absorb the other 5W. This would work, but the power dissipated in the
resistor not only makes it get very hot, but is wasted. The battery is still supplying 10W.
4. An alternative way is to switch the light bulb on and off very quickly so that it is only on for
half of the time. Then the average power taken by the light bulb is still only 5W and the
average power supplied by the battery is only 5W also. If we wanted the bulb to take 6W,
we could leave the switch on for a little longer than the time it was off and then a little more
average power will be delivered to the bulb.
5. This on-off switching is called Pulse Width Modulation (PWM). The amount of power
delivered to the load is proportional to the percentage of time that the load is switched on.
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