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User Diagnostics
72 Operating Manual for XFR 2.8kW Series Power Supply
Table 3.4 User Diagnostics
Symptom Check Further Checks and Corrections
No output and the
display is blank.
Is input voltage within specified
range?
Connect to appropriate voltage source.
See page 40.
Power switch ON? Turn on power.
Internal circuit? See your service technician.
No output but the
display turns on.
OVP LED turned on? See page 61.
Front panel S/D LED turned on? See page 63.
OTP LED turned on? See page 70.
Current limit set to zero? See page 57.
Voltage control set to zero? See page 57.
REM LED turned on? If using remote analog control, check
your analog programming source
(Section 4). If not, refer to your digital
interface manual.
Is front panel ACF LED turned on? Connect unit to AC supply in specified
range. See page 40.
Internal circuit. See your service technician.
Output not adjustable. Is unit in current limit mode?
(Red Current Mode LED turned on.)
Turn current knob clockwise to increase
current limit. Reduce load if current is at
maximum. See page 57.
Is unit in remote mode?
(Green REM LED turned on.)
If using remote analog control, check
your analog programming source
(Section 4). If not, refer to your digital
interface manual.
Is unit at maximum voltage or current
limit?
Reduce load for lower voltage or current
requirement.
Output voltage
fluctuating or regulation
poor.
Is unit at current limit? Increase current limit setting or reduce
load. See page 57.
Is input voltage within specified
range?
Connect to appropriate AC voltage
source.
See page 40.
Are sense lines connected? See page 45 and page 53.
Is unit under remote analog control? Ensure that program source is stable.
Internal circuit. See your service technician.
Output oscillating. Internal circuit. See your service technician.