Guardian Technologies 4759 TEST 23 - TEST TRANSFER RELAY TR, Section, Part, Diagnostic Tests

V-TYPE PREPACKAGED TRANSFER SWITCHES

PART 3

SECTION 3.4

DIAGNOSTIC TESTS

TEST 23 - TEST TRANSFER RELAY TR

DISCUSSION:

In automatic operating mode, the transfer relay must be energized by circuit board action or standby source power will not be available to the standby closing coil. Without standby source power, the closing coil will remain de-energized and transfer to "Standby" will not occur. This test will determine if the transfer relay is functioning normally.

PROCEDURE:

1.See Figure 2. Disconnect all wires from the transfer relay, to prevent interaction.

2.Set a VOM to its "R x 1" scale and zero the meter.

3.Connect the VOM test leads across Relay Terminals 6 and 9 with the relay de-energized. The VOM should read INFINITY.

4.Using jumper wires, connect the positive (+) post of a 12 volt battery to relay Terminal “A” and the negative (-) battery post to Relay Terminal "B". The relay should energize and the VOM should read CONTINUITY.

Figure 2. Transfer Relay Test Points

5.Now, connect the VOM test leads across Relay Terminals 1 and 7.

a.Energize the relay and the meter should indicate INFINITY.

b.De-energize the relay and the VOM should read

CONTINUITY.

RESULTS:

1.Replace transfer relay if it is defective.

2.If transfer relay checks good go to Test 26.

TEST 24- CHECK MANUAL TRANSFER

SWITCH OPERATION

Figure 3. Manual Transfer Switch Operation

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