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Testing Drive Motor Controllers
• Make sure all wires from the controller are disconnected from the Mower.
• Connect a jumper wire from the ground wire to each of the other wires to drain capacitance
Test for short circuit:
1. Set DMM to Resistance Mode.
2. Connect DMM red probe to red power cable
3. Connect DMM black probe to black power cable.
Nominal resistance: 3Meg (or "Open")
Check resistance in controller output:
1. Set DMM to Resistance Mode.
2. Check continuity between any two terminals (heavy Yellow and heavy Green for example).
3. Check continuity between two other terminals (2 and 3 for example).
4. The 2 measurements should be nearly identical.
Nominal resistance: 18.5K Ohms
Diode Check
Test Power and Ground Resistance at output circuitry
1. Set DMM to DIODE MODE
2. Connect black lead of DMM to heavy black wire (ground).
3. Sequentially connect red probe to each of the heavy
Phase wires.
4. The measurements should be nearly identical.
Expected reading : "OL" or "OPEN"
5. Connect black lead of DMM to heavy RED wire
6. Sequentially connect red probe to each of the heavy phase
wires
7. The measurements should be nearly identical.
Typical reading: 0.45V
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Master Drive Controller
Slave Drive Controller
32
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