Guardian Technologies 4456, 4390, 4389 TEST 26 - CHECK 23 AND WIRING/CONNECTIONS, Section, Part

V-TYPE PREPACKAGED TRANSFER SWITCHES

PART 3

SECTION 3.4

DIAGNOSTIC TESTS

TEST 26 - CHECK 23 AND 194

WIRING/CONNECTIONS

DISCUSSION:

An open circuit in the transfer switch control wiring can prevent a transfer action from occurring. In the auto mode, the circuit board supplies +12 VDC to Wire 194. This DC voltage is supplied to the transfer relay (TR) at Terminal Location A . The opposite side of the transfer relay (TR) coil (Terminal B) is connected to Wire 23. Positive 12VDC is present on this also. Circuit board action will allow current to flow through the circuit and the (TR) is energized.

PROCEDURE/RESULTS:

1.Set VOM to DC volts

2.Place generator AUTO-OFF-MANUAL switch to the AUTO position. Utility power should be present; the generator should not start.

3.Connect the negative (-) test lead to a suitable frame ground in the transfer switch.

4.Connect the positive (+) test lead to Wire 194 at the terminal strip in the transfer switch.

a.If voltage is present, proceed to Step 5.

b.If voltage is NOT present, proceed to Step 9.

5.Connect the positive (+) test lead to Wire 23 at the terminal strip in the transfer switch.

a.If voltage is present, proceed to Step 6.

b.If voltage is NOT present, repair wiring between terminal strip and transfer relay (TR).

6.Connect the negative (-) test lead to the ground lug in the generator control panel. Connect the positive (+) test lead to Wire 23 in the generator control panel at the interconnection terminals (ICT) or at the terminal strip.

a.If voltage is present, proceed to Step 7.

b.If voltage is NOT present, repair wiring between transfer switch and generator control panel.

7.Connect the positive (+) test lead to Wire 23 located in the J1 connector Pin Location 3, connected to the circuit board (see Figure 3, Page 4.1-2).

a.If voltage is present, proceed to Step 8.

b.If voltage is NOT present, repair wiring between (ICT and J1connector).

8.Turn off utility power to transfer switch, simulating a utility failure.

a. Generator starts and transfer occurs, discontinue tests.

b. Generator starts and transfer does NOT occur. With the generator running and utility OFF, ground Wire 23 in the control panel at interconnection terminals (ICT) or at the terminal strip. If transfer occurs replace circuit board.

9.Connect the negative (-) test lead to the ground lug in the generator control panel. Connect the positive (+) test lead to Wire 194 in the generator control panel at the interconnection terminals (ICT) or at the terminal strip.

a.If the voltage is present, repair wiring between ICT (or terminal strip) and transfer switch

b.If voltage is NOT present, proceed to Step 10.

10.Connect the positive (+) test lead to Wire 194 located in the J1 connector Pin Location 4, connected to the circuit board (see Figure 3, Page 4.1-2).

a. If voltage is present, repair wiring between J1 connector and ICT (or terminal strip).

b. If voltage is NOT present, replace circuit board.

TEST 27- CHECK VOLTAGE AT TERMINAL

LUGS N1, N2

DISCUSSION:

If retransfer to the "Utility" power source side is to occur, utility source voltage must be available to terminal lugs N1 and N2 of the transfer mechanism. In addition, If that source voltage is not available to NI/N2 terminals, automatic startup and transfer to "Standby" will occur when the generator manual-off- auto switch is set to AUTO. This test will prove that "Utility" voltage is available to those terminals, or is not available. It is the first test in a series of tests that should be accomplished when (a) retransfer back to ’Utility" does not occur, or (b) startup and transfer occurs unnecessarily.

DANGER: PROCEED WITH CAUTION! HIGH AND DANGEROUS VOLTAGES ARE PRESENT AT TERMINAL LUGS N1/N2. CONTACT WITH HIGH VOLTAGE TERMINALS WILL RESULT IN DANGEROUS AND POSSIBLY LETHAL ELECTRICAL SHOCK. DO NOT ATTEMPT THIS TEST WHILE STANDING ON WET OR DAMP GROUND, WHILE BAREFOOT, OR WHILE HANDS OR FEET ARE WET.

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