Checks If The Output Does Not Turn On; Checks For General Fault Conditions; Table 8-1. General Fault Conditions - Advanced Energy MDX II User Manual

CHECKS IF THE OUTPUT DOES NOT TURN ON

If the output does not turn on, possibly a fault condition exists or an internal software
configurable parameter has been changed. Do the following:
1. First check to see whether a fault message is displayed. If so, take the action listed in Table
9-2 on page 9-15.
2. Ensure that the settings for power limit, current limit, Iarc, and Varc configurables are
correct.
3. Ensure that the control mode selected and the program source settings (see page 5-16)
match the setpoint source.
4. Ensure that the unit is receiving an "on" command.

CHECKS FOR GENERAL FAULT CONDITIONS

Table 8-1. General Fault Conditions

Fault Condition
Output limits are below the
desired setpoint
Output displays half the
desired setpoint in User port
control mode
High voltage output with no
current or power
High current output with no
voltage or power
5700262-R
Explanation
An internal software config-
urable parameter has been
changed or the tap setting
and load impedance do not
match.
IN COM.A (pin 10) is not
referenced correctly to sys-
tem ground.
An open load or very high
impedance load exists.
A low impedance load
exists.
Troubleshooting and Customer Support
MDXII Power Supplies
Suggested Action
Ensure that the settings for
power limit, current limit,
Iarc, and Varc configurables
are correct.
Ensure that the tap setting
matches the load imped-
ance (see "Selecting the
Correct Tap" on page 5-8).
Ensure that User port pin 10
(IN COM.A) is connected to
system ground.
Turn off the output.
Verify the load connections
and tap setting (see "Select-
ing the Correct Tap" on
page 5-8).
Turn off the output.
Verify the load connec-
tions, load conditions, and
tap setting (see "Selecting
the Correct Tap" on
page 5-8).
8-3