mep 004a no fault lights working plus more

[KLChurch]

S7 in run mode
The only terminals hot is #8 and #11
All the rest cold. Checked them all.
Kris

 

[KLChurch]

I could not see the pin numbers so I used the wire numbers to assume the terminal numbers. Ass you me.
Kris

 

[KLChurch]

Bench tested the two A4 relays to be OK
Kris

 

[KLChurch]

I remembered that A1 has + and - terminals so I tested in Run and Stop modes.
No 24 VCD either position.
Kris

 

[Guyfang]

Bench tested the two A4 relays to be OK
Kris

Push in CB1.
Open the control panel.
Put your fingers on the K1. Place S2 in the run position. Do you feel it click?

In the run configuration, CB1 pushed in, S2 in run) do you have 24 VDC at TB1-10, (terminal board in the control panel)?

 

[Guyfang]

Just edited my last post

 

[KLChurch]

No K1 click
24 VDC at TB1-10 in run mode.
By the way, why do you keep me pushing CB1? It never is out.
Kris

 

[Guyfang]

I remembered that A1 has + and - terminals so I tested in Run and Stop modes.
No 24 VCD either position.
Kris

Did you test from ground to Pin A for 24 volts in the run position, and then from pin B to ground, OHMS position for the meter?

 

[Guyfang]

No K1 click
24 VDC at TB1-10 in run mode.
By the way, why do you keep me pushing CB1? It never is out.
Kris

Bad habit. We will just call it run configuration now, or start configuration.

Wire number 45A goes from TB1-10 to S2, pin 3. When the S2 is in the run configuration, then the power should come out on S2 pin 2, wire number P40S. Trace the flow this far.

 

[KLChurch]

A1 terminal -
No continuity to ground.

A1 terminal + with run on
No volts

Still trying to trace the wires 45A and P40S.
Kris

 

[Guyfang]

Something to do after you trace the wires. Disconnect the cable between the A9 fault indicator, and the SP relay box. Ohm out pins A & B, to see if maybe a wire is broken or unhooked.

 

[KLChurch]

Wire number 45A goes from TB1-10 to S2, pin 3. When the S2 is in the run configuration, then the power should come out on S2 pin 2, wire number P40S. Trace the flow this far.
45A From TB1-10 to S2 in run config has continuity.
P40S from pin 3 to pin 2 in run config has continuity.
Kris

 

[KLChurch]

Need to know what wires are they between A9 and SP.
Kris

 

[KLChurch]

I cant believe I graduated to sergeant major. So I get a promotion for being a pupil?


Kris

 

[KLChurch]

Instead of checking the continuity of just the two wires between SP and A9, I checked all of them.
All had continuity.
No broken wires
Kris

 

[Guyfang]

Lets do a round up.

When you felt K1, you didn't feel any click.
Earlier you tested the A4 card, and said you had VDC at pin 7, in run mode. But no VDC on pin 9. You also said you had in the start position, voltage on pin 8, but not pin two.

This means K1 is not closing.

View attachment Scan_0003.pdfThis is a schematic for the A4 card. Take it out of the control panel. Use your 24 volt power supply to do the test outlined in paragraph d. But we change it up a bit. With no VDC applied, you test ohms between pins 1&3. Should get continuity. Pins 7&9. Should be open. Then apply VDC and that should be reversed.

 

[KLChurch]

OK I will report back in a couple hours.
Glad I can do it in my house. It is hot outside.
Kris

 

[KLChurch]

This is a schematic for the A4 card. Take it out of the control panel. Use your 24 volt power supply to do the test outlined in paragraph d. But we change it up a bit. With no VDC applied, you test ohms between pins 1&3. Should get continuity. Pins 7&9. Should be open. Then apply VDC and that should be reversed.

Everything tested correctly to the above test.
Also I heard a click on K1 when 24 vdc applied
Kris

 

[KLChurch]

Bench test pics front and back

 

[Guyfang]

Ok. Put it back in. Then using the M-meter on ohms, on terminals 1&3, (getting continuity) put the S2 in the start mode. You should get an open. Does that happen?