Midmark® Smart Air Compressor Capacitor Test and Repair
The capacitor’s function is to store electricity, or electrical energy. The capacitor also functions as a filter, passing alternating current (AC), and blocking direct current (DC).
Capacitors are located on Compressor Heads
The best check is to replace the capacitor with testing a known good one. The replacement capacitor MUST be of the same Mfd and Voltage Ratings or the motor could be damaged.
1HP 115V Run Capacitor: 40MFD 370v / Start Capacitor: 430-516MFD 125v
1HP 230V Run Capacitor: 20MFD 440v / Start Capacitor: 145-174MFD 220v
1.Disconnect power.
2.Access start and run capacitors and disconnect capacitor wiring.
3.Discharge capacitors by touching screwdrivers to two contacts on a capacitor and to each other.
4.Set meter to highest Ω reading.
5.Place meter probes on capacitor connectors. Reverse the leads, this should produce the same reading.
|
Meter Reading |
Status |
Required Action |
|---|---|---|
|
O or Open Reading |
|
Replace Capacitor |
|
Start Low and Increases |
|
Capacitor OK |
