19 Troubleshooting
19.1 Warning and Error Messages
19.1.1 Polarity reverse or HV and LV reverse
Before the devices starts the resistance measurement in mode C or D, the 2293 does a ratio check to
verify that the transformer is connected correctly and the vector group and phase displacement are correct.
Polarity reverse the measured ratio is negative (Ratio < 0).
HV and LV reverse the measured ratio is positive smaller than 0.9 (0 < ratio < 0.9).
In any case, please check the connections from the 2293 to the DUT and the transformer vector group and
phase displacement configuration (e.g. YNyn6).
19.1.2 Current to small
During charging the device checks if the applied current reaches the set current. If the applied current is
much smaller than the set current or even zero, this error message pops up. To solve the problem, check
the connections to the DUT or reduce the measuring current when trying to measure high resistances.
19.1.3 OVP - Overvoltage Protection
This message appears when the voltage between any pair of measuring leads to the DUT exceeded 250V
and thus the OVP was triggered.
If you are performing a resistance measurement on the LV side of a transformer with a high ratio (e.g.
distribution transformer) and this error arises during charging, you should try to disconnect the HV
measuring leads. Because applying any voltage to the LV side results in a much higher voltage at the HV
side.
19.1.4 OCP - Over current Protection
The device automatically shuts down the supplies if the current during measurement exceeds certain limits.
It is possible that there is a hardware failure if this happens regularly.
19.1.5 OTP - Over temperature Protection
The temperature of the cooler of the power supplies is monitored permanently. If this temperature exceeds
a certain safety limit, the supply will automatically shut down. This can be caused by very high ambient
temperatures (>60°C) or direct exposure to the sun. If this is not the case, the reason is probably a
hardware malfunction.
To Next Page
Loading...