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1. Power Supply
Set the power supply voltage mid way between the two voltage trip settings.
Check the current indicated on the milliammeter (3) is approximately 20mA.
NB: Replace the milliammeter (3) with a link for the following tests.
2. Over Voltage Trip
Slowly increase the voltage until the over voltage alarm LED lights.
3. Over Voltage Reset
Slowly reduce the voltage until the over voltage alarm
LED extinguishes
4. Under Voltage Trip
Slowly reduce the voltage until the under voltage alarm LED lights.
5. Under Voltage Reset
Slowly increase the voltage until the under voltage alarm LED extinguishes
6. Cut-off Facility
For units with cut-off facility, slowly increase the supply voltage until the over voltage LED
lights and check that the cut-off relay alarm trips after the specified time delay.
7. Timer
Increase the voltage to a value above the over voltage trip point. Note the time between
the over voltage alarm LED coming on and the output relay alarm tripping.
8. High Impedance
Set the power supply voltage midway between the two voltage trip points. Increase the
series resistance (5) from zero until the high impedance LED comes on.
NB: Reset the series resistance to zero.
9. Earth Fault, Positive (Negative)
Connect point A to the positive (negative) terminal of the alarm. Slowly decrease the
resistor (10) from 100k
Ω
until the positive (negative) EARTH FAULT LED lights.
The earth fault current is proportional to the reading on the voltmeter (9). The total
resistance (8) + (10) should be specified value
±
10%.
10. Output Contacts
The correct operation of the relay contacts can be checked using a battery operated test
lamp or buzzer.
A version with both relays designated as non-urgent is also available: Refer either to the
connection label or the Operating and Maintenance manual for relay connections.
Содержание BA300
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