Electric baws…what is this schematic symbol?

Robot porn

It’s been many, many years since I had to even think about an electric schematic. So maybe my memory is failing me. But I don’t recognize that symbol.

What make and model excavator you working on?

More ChatGPT

Got it — you’re narrowing down a “no power to the A/C compressor” issue on an excavator, and you’re at the point in the schematic where power disappears after some point on wire 36, near the M1 (compressor motor).

From the image, here’s what you’re likely dealing with:

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?? Interpretation of Your Diagram Segment
• Wire 36 has power before reaching the compressor motor (M1), but not at M1.
• The symbol in the image shows:
• Power flows through wire 36
• It passes through what looks like a connector (symbol: open semicircle)
• Then it goes to M1 (A/C Compressor Motor)
• It’s labeled with H1, possibly a connector or harness reference

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? Next Diagnostic Steps

Here’s how you can move forward logically:

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1. Locate Connector H1
• The “H1” in the diagram most likely refers to a harness connector (could be a junction, plug, or terminal block).
• Find H1 physically on the machine using the service manual or wiring layout (usually near the compressor or in the A/C harness).
• Check for corrosion, looseness, or burn marks.

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2. Test Wire 36 at Both Sides of Connector
• Use a multimeter or test light:
• Test power before H1
• Test power after H1 (toward M1)
• If you have power before H1 and nothing after ? bad connector or broken wire inside loom

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3. Check Ground Side of the Circuit
• The compressor may not run without a proper ground.
• Check if M1 has a good chassis ground or if the ground wire is intact.

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4. Check Relay or Pressure Switch (if in line)
• Some A/C compressors won’t get power unless the system passes through:
• Pressure switches (low/high)
• A/C clutch relay
• Thermal cutoff switches
• These can be inline on wire 36 or associated branches.

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5. Check for CAN/BMS Control (if newer excavator)
• If it’s a newer model, a Body/AC Control Module may control power to the compressor via logic or CAN signal.
• In that case, the module won’t send power unless conditions are right (engine running, refrigerant OK, temp demand present).

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Let me know:
• The make/model/year of the excavator
• If you want to upload more of the schematic
• If you’ve identified voltage at a certain connector and not beyond

I’ll walk you through the next layer based on what you find.

• The semicircle symbol: This is the standard representation of a motor compressor, especially in HVAC schematics.

That is interesting I have never seen a motor on any schematic shown like that. Motors are normally circles with an M or an M and a number if more than one motor is in the system. Compressors usually have three connections with 2 coiled lines going from R & S to C. It looks like a capacitor (ie run capacitor) but the semi-circle is pointed the wrong way. It looks like I have seen male and females plus in all manner of schematics and mechanical drawings. The male plug may be attached to the motor or motor 1 as it were.

Heavy equipment could have a completely different setup than I am used to seeing in engine driven A/C systems.

quote:

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a shallow vag

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or thicc hymen

quote:

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That symbol is not for an electrical component. I look at schematics nearly daily and have never seen this. It's likely a proprietary symbol.

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You have never seen that used for a male and female electrical connector?


I had to Google a little to make sure I was not going crazy.

It is the AC in my TB260 we are working on.

Thanks baws.

Can you show us more of the subsytem schematic?

This is my guess:

It is an electrical connector. It is attached on the male side to a motor (likely a circle with a M or M1 inside and may have one or more caps before it gets to the motor), the 36 is the wire trace number, and the female side is attached to one of the legs coming off the high side of a transformer.

I reached out to both my hvac and electrician friends, they said when they get they counting their millions they’ll get back to me.