Chroma 61705 - Troubleshooting Common Issues

Programmable AC Source 61705 User’s Manual
7-2
1. Press ENTER to ignore the NG.
2. If there is no PROTECTION, press PAGE/EXIT to change to MAIN PAGE.
3. Program a small voltage such as 10Vac and press OUT/QUIT, see the measurement from
LCD display if V is 10V or not.
If the reading of V is around 10V, the AC Source needs to be calibrated (see Chapter 4). If
the reading does not change obviously or shows an unreasonable value or display shows
PROTECTION, the AC Source has some problems. Consult your dealer for assistance.
7.3 Troubleshooting
The following table lists the operating problems and suggested corrective actions:
Problem
Reason
Solution
Poor measurement
of V, I.
Aging of components result in
deviation of characteristics.
Periodic calibration is required. Refer
to Chapter 4 Calibration.
Distorted output
1. The AC Source output
voltage is too low.
2.
The rectified load is too large
at high frequency.
1. Program higher output voltage.
2. Reduce the load or lower than the
output frequency.
OVER TEMP
protection (OTP)
1. Ambient temperature is too
high.
2. Airway is obstructed.
1. Operate the unit in 0 ~ 40°C.
2. Unblock the airway.
OVER POWER
protection (OPP)
The output power is over
specification.
Remove the over power or lower down
output voltage.
OVER CURRENT
protection (OCP)
The output current is over
specification or I LIMIT.
Remove the overload or relax the I
LIMIT.
OUTPUT SHORT
protection
1. The output is shorted.
2. External current reverse.
1. Remove the short.
2. Remove the load.
INPUT FAIL
protection (UVP)
The AC Source line input
voltage is too low or too high.
Measure the input voltage, and
regulate it if it is over specification.
INT _ AD protection
1. Line input voltage cycle
dropout.
2. Instant over current of
output.
3. AD power stage damaged.
1. Check the stability of input voltage.
2. Remove the load.
3. If cannot reset the protection state,
consult the dealer for assistance.
INT _ DD protection
1. Line input voltage cycle
dropout.
2. Instant over current of
output.
3. DD power stage damaged.
1. Check the stability of input voltage.
2. Remove the load.
3. If cannot reset the protection state,
consult the dealer for assistance.
Problem
Reason
Solution
OUTPUT OVP
protection
1. Remote sense is open.
2. Output voltage peak is over
range.
1. Connect the output to remote sense
terminals.
2. Check the settings of Vac and Vdc
on MAIN PAGE.
Cannot control AC
S
ource by GPIB
1. The AC Source unit address
is incorrect.
2. GPIB cable is loose at rear.
1. Update the unit address.
2. Check the connection and tighten
the screws.