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Finding phase order for Resolver commutation
In order to enable the user to find the right order of motor phases, the following procedure has to be performed:
1. Connect the Resolver according to the following table:
 
EBA/IBP terminals
(Horizontal type)
SBA terminals
Resolver terminal
20
25
Screen
23
8
S1
24
7
S3
25
6
S2
26
5
S4
27
9
R1
28
10
R2
Leave the screen open on the motor/Resolver side.
  Connect the power common (terminal 1 in EBA/IBP or terminal G in SBA) to the motor chassis.
  Check the commutation DIP switch for 60° position.
2. Do not connect the motor leads - leave them open for the following tests.
3. Connect a two channels scope as follows:
 
Channel 1:
Channel 1 (GND) - connect to the circuit common of the amplifier.
Input signal - connect to commutation signal A.
Pin 1 of J20 for EBA/IBP, or Pin 10 of J5 for SBA - connect to commutation signal A.
Channel 2:
Channel 2 (GND) - connect to motor phase B.
Input signal - connect to to motor phase C.
4. Rotate manually the motor in CCW direction (view in front of the output shaft).
5. If the signals you observe in the scope are coherent (see following plot), the phases selection done under 3 is correct. If not, select another pair of motor phases until you get the required result.
6. If there is no combination which results with the right phasing, select the pair that gives the closest result and program a new EPROM with the right phase shift.
Correct pair of sensor / phase (alternative A)
Wrong pair of sensor / phase
 
7. Continue the test by connecting the scope channels as follows:
 
Channel 1:  
Channel 1 (GND) - connect to the circuit common of the amplifier.
Input signal - connect to commutation signal B.
Pin 2 of J20 for EBA/IBP, or Pin 11 of J5 for SBA - connect to commutation signal A.
Channel 2:  
Channel 2 (GND) - connect to motor phase A.
Input signal - connect to to motor phase B.
8. Rotate manually the motor in CCW direction (view in front of the output shaft).
9. If the signals you observe in the scope are coherent, the phases selection done under 3 is correct. If it is not, re-define phase B as C and C as B (alternative B). This will results in a 180° phase shift between the Hall signals and the BEMF (see following plot). You may want to double check this by starting again from step 3 but this time expect 180° phase shift in both steps (3 and 7).
 
Correct pair of sensor / phase(alternative B)