ElmoMC SimplIQ Software Manual - Manual (Page 116)

SimplIQ Software Manual Commutation
MAN-SIMSW (Ver. 1.4)
8-6
As shown in the table, change CA[25] switches the B and C phases. Actually, changing
CA[25] will reverse the direction in which the motor moves for a given torque command.
8.3.4.2 Hall Sensor Parameterization
Figure 8-1 presents an idealized picture of the digital Hall sensor reading. All waveforms
are in the precise phase and polarity. In practice, the results of the figure may not equal
what is seen immediately after connecting the motor and its sensors to the
SimplIQ drive.
ƒ The Hall sensors must be matched to the motor coils. The connection order of the Hall
sensors to their respective connectors pins may be incorrect, or the motor phase
connections may have been switched (as described in the previous section) to modify the
motor direction.
ƒ The Hall sensors may be active high or active low. For certain Hall sensor arrangements
(known as 30º arrangements), two sensors may be active high and the other one active
low, or vice versa.
In addition, the switching lines in the figure are set at 30, 90, 150, 210, 270 and 330 degrees.
The even spacing of 60º is true for most motors, but many motors exhibit a significant origin
deviation. For example, with a 10º deviation, the digital Hall sensor switching points may be
at 40, 100, 160, 200, 280 and 340 degrees respectively. This error, although hardly noticeable
at low speed, causes the loss of significant motor torque at high speed.
If Hall sensors are not present, and if commutation is performed using an incremental
encoder, then upon starting the motor, the
SimplIQ drive must first find the electrical
direction of the motor. If digital Hall sensors are not present (CA[20]=0), then at motor on, a
commutation search is performed (refer to
section 8.4 ).
The following parameters describe the Hall sensors:
Parameter Description
CA[1]
Polarity of digital Hall sensor A: 1 for active high; 0 for active low.
CA[2] Polarity of digital Hall sensor B: 1 for active high; 0 for active low.
CA[3] Polarity of digital Hall sensor C: 1 for active high; 0 for active low.
CA[4] Actual Hall sensor connected to A Hall connector pin:
1 for A, 2 for B and 3 for C.
CA[5] Actual Hall sensor connected to B Hall connector pin:
1 for A, 2 for B and 3 for C.
CA[6] Actual Hall sensor connected to C Hall connector pin:
1 for A, 2 for B and 3 for C.
CA[7] Offset of digital Hall sensors in encoder units. The range for this parameter
is [0…CA[18]-1]. This parameter compensates for deviations in the Hall
sensor switching point. If no encoder is present, set this parameter to zero.
CA[20] Digital Hall sensors present:
0: No digital Hall sensors connected
1: for Digital Hall sensors connected.
Table 8-2: Hall Sensor Parameters