Associated Research HYPOTULTRA III 7620, Operation And Service Manual, Page: 80 / 148

72
The following describes how the relays operate for each test condition.
PROCESSING - The relay contact closes the connection between pin (5) and pin (6) while the
instrument is performing a test. The connection is opened at the end of the test.
PASS - The relay contact closes the connection between pin (1) and pin (2) after detecting that
the item under test passed all tests. The connection is opened when the next test is initiated or
the reset function is activated.
FAIL - The relay contact closes the connection between pin (3) and pin (4) after detecting that
the item under test failed. The connection will open when the next test is initiated or the reset
function activated.
RESET - The relay contact closes the connection between pin (7) and pin (8) when the RESET
button is pressed. The connection will close when the Reset button is pressed and will remain
closed until the RESET button is released.
7.2. Signal Inputs of Remote I/O and Programmed Test Files
The HypotULTRA III remote connector enables remote operation of the TEST, RESET, and
REMOTE INTERLOCK functions, and allows the operator to select one of 10 pre-
programmed test files.
When the PLC Remote mode is on, the HypotULTRA III will respond to simple switch or relay
contacts closures. A normally open momentary switch can be wired across pins 3 and 5 to
allow remote operation of the TEST function. A minimum pulse width or contact closure of
20mS is required to guarantee a test start. A normally open momentary switch can be wired
across pins 2 and 5 to allow remote operation of the RESET function. A minimum pulse width
or contact closure of 50mS is required to guarantee that a running test will abort. When the
PLC remote function is (ON) the TEST switch on the front panel will be disabled to prevent a
test from being activated through this switch. For safety, the front panel RESET switch remains
active even when a remote reset switch is connected so that high voltage can be shut down from
either location.
The Remote File Select function gives the user the capability to quickly change parameters and
initiate a test remotely. Ten pre-programmed test files can be accessed by connecting pins
1,6,8, and 9 to the common pin 7, in different combinations. The memory select bits should be
set simultaneously and remain set for a minimum of 20ms to guarantee that the correct memory
will be selected. However, the memory select bits may be set in sequential manner, provided
that the time delay between each bit is less than 4ms. When the desired bit pattern has been
established it should remain set for a minimum of 20ms to guarantee that the correct memory
will be selected. The
Remote File Select Truth Table (binary) shows the different
combinations of momentary switch (relay) closures, and which memory programs that will be
selected as the result. It may be necessary to "OR" the momentary switches (relay contacts) to
prevent incorrect program selection due to timing errors.