Seaward B255 User Manual
Page 17
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Operating Manual
Clare B255 Power Tool & Appliance Test Station
13
Facia Controls
1. Display Meter – multi-scale meter to show Earth Circuit Resistance, Load
Current and Leakage Current values.
2. Set Inf. Control – used for setting the full scale (INF.) indication of the meter
to compensate for mains fluctuations or differences from location to
location. Please refer to Set-Up Procedures for adjustment details.
3. Test Selector – a rotary switch for selecting the required test. When
connecting or disconnecting items to be tested OR when the instrument is
to be left un-attended or tests are not being applied, always set this switch
to one of the STANDBY positions, the test buttons are then disabled.
4. Supply Switch – an illuminated two-button device for controlling the
incoming supply to the instrument. Firmly depress the upper green button
to turn the instrument ON, (button illuminates) and the lower red button to
turn it OFF. This switch also acts as a miniature circuit breaker (mcb) to
protect internal wiring.
5. Flash Test Result indicators – a green PASS lamp and red FAIL lamp
indicate test status whenever any of the Flash tests are applied, a flash fault
is also indicated by a high pitched audible alarm.
6. Safety Test buttons – the white, momentary action, PRESS TO TEST
button is used to apply the selected Earth or Flash test. The adjacent, red,
10mA button can be used to increase the standard 5mA trip level for the
500V and 1250V LN-E tests only - this button must be depressed and held
BEFORE the main TEST button is depressed.
7. Load Test buttons – the LOAD TEST button is used to apply mains voltage
to the product under test and the resultant run current is displayed on the
middle 0-25A scale. For readings below 2.5A the meter range can be
expanded to read 0-2.5A full scale by also depressing the 2.5A button.
The LOAD TEST button is also used to apply a selected EARTH LEAKAGE
test, which again requires the product to be powered. The measured leakage
current will be displayed on the lower 0-5mA meter scale.
8. Set Zero control – used to set ‘mechanical zero’ on the meter. This is
carried out during factory build and calibration procedures and should not
normally be re-adjusted by the user.