C H A P T E R 9 – T R O U B L E S H O O T I N G
AT5600 User Manual 98-119 issue 14 Page 203
9.2.3. Voltage Present Error
This message is a serious error indicating that voltage may still be present on the
AT5600 fixture. If seen, the power to any external AC sources must be switched
off first, followed by the power to the AT5600. When it is certain that any possible
hazards have been removed, the self-test fixture should be fitted to the AT5600
before being switched back on, and then a self-test system test initiated to check
the AT5600 for any faults.
If the AT5600 is found not to be faulty then the cause of this error must either;
1. An external source connected incorrectly
2. A faulty Voltech AC interface fixture
3. A capacitance is becoming charged within the part under test
An external source (used for one of the external source tests such as MAGX,
VOCX, WATX and STRX) must be connected via a Voltech AC Interface fixture,
and if necessary, a contactor connected to the safety interlock system must break
the signals from the external source when the interlock is opened. The AC
Interface cannot be relied upon to protect the operator from dangerous voltages at
its input.
If an external source is not being used, then the problem is most likely to a
capacitance charging during a Hi-pot test (normally HPDC). You must make sure
that any capacitance is limited to 30nF. Although the AT5600 is capable of
discharging capacitance values higher than this, in the case of a single fault
occurring within the AT5600, a part may not be discharged correctly (even when
the safety interlock is broken) and any more than 30nF may be dangerous to the
operator
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