Uploaded March 2022 | Updated September 2026, 2 weeks ago
INTRODUCTION AND WIRING FOR TESTING
0:55 Missing wiring diagram (on connection plate)
1:55 Looking at the 5 terminals AZ, A, Z, S and T (K not connected)
2:50 Adding terminal wire "tails" for testing
4:30 Recommended nut driver (2BA size)
9:10 Resilient mount motor and earthing
9:30 Adding Wago terminal blocks
TESTING
10:15 Identifying the run winding (AZ - A)
11:00 Low resistance of the run winding (4.3 Ohms)
12:20 Checking run winding is isolated from other terminals
13:30 Identifying the start winding (S - T)
13:50 Higher resistance of the start winding (14.3 Ohms)
14:40 Identifying the capacitor terminals (Z - S) --- this test needs to be improved!
17:40 Charging the capacitor with a battery (and watching it discharge)
22:25 Wiring motor with the start winding disconnected (not recommended!)
23:40 Motor fails to start with start winding disconnected
24:20 Using a pull cord to start the motor (spin motor to synchronous speed)
26:30 Where is the centrifugal switch wired?
27:25 Adding a battery and indicator lamp to the start winding to check centrifugal switch
29:40 Battery and lamp circuit diagram
30:40 Checking centrifugal switch operation
FINAL WIRING AND FUNCTIONAL TESTING
30:30 Wiring run and start winding in parallel
36:50 Motor runs (clockwise - looking at output end)
38:10 Changing the motor start direction
39:35 Motor runs (anticlockwise)
42:00 Checking current using a clamp meter
We examine a Brook Cro mpton Parkinson single-phase capacitor-start induction motor with 5 terminal connections labelled AZ, A, Z, S and T. We use a multimeter and continuity lamp to check wiring and operation of the centrifugal switch. We see what happens when the start winding is disconnected (not good!) and then try starting the motor using a pull cord instead of the start winding. We then wire the run and start windings and check the motor start direction can be reversed.
AZ and A = run motor windings
S and T = start winding (includes the centrifugal switch)
Z and S = the start capacitor
INTRODUCTION AND WIRING FOR TESTING
0:55 Missing wiring diagram (on connection plate)
1:55 Looking at the 5 terminals AZ, A, Z, S and T (K not connected)
2:50 Adding terminal wire "tails" for testing
4:30 Recommended nut driver (2BA size)
9:10 Resilient mount motor and earthing
9:30 Adding Wago terminal blocks
TESTING
10:15 Identifying the run winding (AZ - A)
11:00 Low resistance of the run winding (4.3 Ohms)
12:20 Checking run winding is isolated from other terminals
13:30 Identifying the start winding (S - T)
13:50 Higher resistance of the start winding (14.3 Ohms)
14:40 Identifying the capacitor terminals (Z - S) --- this test needs to be improved!
17:40 Charging the capacitor with a battery (and watching it discharge)
22:25 Wiring motor with the start winding disconnected (not recommended!)
23:40 Motor fails to start with start winding disconnected
24:20 Using a pull cord to start the motor (spin motor to synchronous speed)
26:30 Where is the centrifugal switch wired?
27:25 Adding a battery and indicator lamp to the start winding to check centrifugal switch
29:40 Battery and lamp circuit diagram
30:40 Checking centrifugal switch operation
FINAL WIRING AND FUNCTIONAL TESTING
30:30 Wiring run and start winding in parallel
36:50 Motor runs (clockwise - looking at output end)
38:10 Changing the motor start direction
39:35 Motor runs (anticlockwise)
42:00 Checking current using a clamp meter
We examine a Brook Cro mpton Parkinson single-phase capacitor-start induction motor with 5 terminal connections labelled AZ, A, Z, S and T. We use a multimeter and continuity lamp to check wiring and operation of the centrifugal switch. We see what happens when the start winding is disconnected (not good!) and then try starting the motor using a pull cord instead of the start winding. We then wire the run and start windings and check the motor start direction can be reversed.
AZ and A = run motor windings
S and T = start winding (includes the centrifugal switch)
Z and S = the start capacitor
