Voltage Present Error - Voltech AT5600 User Manual

C H A P T E R 9 – T R O U B L E S H O O T I N G
9.2.3.
This message is a serious error indicating that voltage may still be present on the
AT5600 fixture.
After any HPDC, HPAC or IR test, the nodes used in that test are connected
internally to a discharge resistor (330 KOhm for DC, 50 KOhm for AC) to ensure
any voltages are removed before opening the relays and progressing to the next
test.
This prevents any hot switching of the relays and ensures longevity of the unit.
If after a maximum 3 seconds, the Voltage present has not decayed to below
100V or 5mA, then a VPRES error is posted.
This is typically seen as a 0240 or 0040 error code (see 9.1.2 for error codes)
With AC INTERFACE
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 hazards have been
removed, any fixture should be removed 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 (i.e., passed self-test) 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.
Without AC INTERFACE
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.
AT5600 User Manual 98-119 issue 30

Voltage Present Error

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