How can I troubleshoot a potential relay coil?
Troubleshooting of a potential relay can be done with an ohmmeter. All electrical connections must be removed from the relay. If the resistance across terminals 2 and 5 is zero, then the relay coil is shorted. If the resistance across termi- nals 2 and 5 is infinite, then the relay coil is open.
How are current relays supposed to be mounted?
Current relays are position- sensitive; they must be mounted in an upright position. The current relay has a low-resistance coil of wire wrapped around the outside of the relay body (see Figure 1). This coil of wire is in series with the run winding of the motor.
When to remove a relay from a compressor?
The relay must be removed from the compressor hermetic terminal to check the resis- tance of the PTC material. The resis- tance of the PTC material should be from 2 ohms to 5 ohms. If the resistance is less than 2 ohms or greater than 5 ohms, the relay should be replaced. Conclusion
What causes the run winding to drop out of a relay?
Current in the run winding is at its peak when power is first applied to the compressor. Initially, a solenoid effect acts on the armature to close the relay contacts and engage the start winding. As motor speed increases, the run winding current decreases, causing the contacts to open and drop the start winding out of the circuit.
When to replace the contacts in a relay?
If the contacts are welded, they should be replaced. If the contact capacity is too small, replace the relay with a larger capacity. If the contact pressure is not enough, the spring can be adjusted or replaced to increase the pressure. If the pressure is still insufficient, the contacts should be replaced.
When do you need to troubleshoot a relay?
That is, on a horn, 12V should always be present on 86, and 85 is grounded when the horn button is pressed). If the control side fails either of these tests, you must troubleshoot the wiring. Often it is a problem in whatever is switching the control side on and off.
Why does a solid state relay not turn off?
After you turn of the control voltage, it has no path to discharge, aside from through the relay. That relay, being a solid state one, will have a high input resistance, and thus will take forever to discharge the capacitor. As long as the capacitor’s charged, there’s voltage across it, and thus, the relay won’t turn off.
When do you need to replace the ECM power relay?
If there is no power when the key is inserted, the engine will not start, or the battery is dead, you may need to replace the ECM power relay. 1. No power when the key is inserted 2. Engine will not start 3. Battery drain or dead battery Average rating from 130,153 customers who received a Vehicle Engine Electrical Inspection.