Phenix Technologies HC-75C Operator's Manual page 16

BASIC OPERATION
These steps should be followed to test a circuit breaker after the POWER ON procedure in Section 6:
Ensure that the test set's main circuit breaker, CB201, is open.
1.
2. Connect the breaker under test to the output of the test set. Ensure the output is configured
correctly (either Parallel or Series connection) and the WinHC connection setting matches the
configuration. Also see CONNECTION NOTE on page 8-1.
3. If required, select the voltmeter sensing mode (INPUT, OUTPUT, or EXTERNAL) by clicking the
Voltmeter radio button. The metering system is auto ranging. To see the current range, mouse-
over the voltmeter display for 3 seconds.
4. Switch CB202 ON (if previously opened), then switch CB201 ON.
5. Ensure that Tap 1 is selected and the Vernier is at approximately 1%. Alternately, the Vernier
and Tap may be set closer to their final positions, if known, to limit the time to reach a specific
current level.
6. Click CONTACT MODE to select the method of breaker trip sense. Select either Normally Open
(N.O.), Normally Closed (N.C.), or Current Latch Contact Mode. If using N.C. or N.O. sense,
connect the continuity sense leads to an unused set of contacts on the breaker under test. The
N.O. and N.C. modes offer more reliable trip timing than Current Latch, and should be used
whenever possible (i.e. multi-phase breakers).
7. Click CURRENT RANGE to select the appropriate current range. For best resolution, select the
lowest appropriate range for the expected current. The test set may auto-range up if the output
current exceeds the selected range and Range Error will be displayed on the current meter. If this
occurs, the test should be performed again to obtain a correct current measurement.
8. Click TEST MODE to select the desired mode of operation. The currently selected test mode will
be displayed on the bottom line of the LCD. The available test modes are as follows:
● NORMAL MODE
● MEMORY MODE
● JOG to TRIP
● JOG to HOLD
● CURRENT HOLD
9. Click Settings in Test Parameters to access the test parameters. See the specific procedures for
the different Test Modes on the next few pages.
HC 75C
TESTING PROCEDURE
In this mode, the test technician controls all of the functions.
This mode retains the test results after the output is manually turned off
(without the breaker tripping) to allow saving of the test results. It is used
for tests that do not cause the breaker to trip, for example, performing a
minimum pickup test, where the output is slowly increased until the
minimum pickup indicator illuminates.
This mode is used for determining the instantaneous trip point of the
circuit breaker under test.
This mode is used to reach a desired breaker holding current with
minimal breaker stress.
This mode is used to maintain a preset current value for a long period of
time.
8-2