ETEL Doc. - Operation & Software Manual # DSC2P 903 / Ver. F / 3/6/05
Chapter C: System functions
Operation & Software Manual
Direct Drives & Systems
107
We consider that the motor has reached a stable balance point position after this lapse of time.
To sum up, these are the three possible initial configurations:
Case 1:
The motor is not in a balance point position (stable or unstable) and moves to a stable balance
point position when the current in the phase is increased.
Case 2:
The motor is in a stable balance point position and when the current increases, it follows the
shift of the balance point position.
Case 3:
The motor is in an unstable balance point position and when the balance point moves, the
motor is confronted to the same problem as case 1 and moves when the current increases to
a stable balance point position.
As we see, in all cases, the motor reaches at the end of the phasing a stable balance point position. Moving
the pointers in the motor look-up table is useful when the motor is initially in the same configuration as case 3.
12.7.2.3 Phasing with digital Hall effect sensor
It is possible to interface digital Hall effect sensor only with three-phase motors. Three digital inputs (H1, H2
and H3), specific or not, can be used to connect a digital Hall effect sensor (except on the DSCDL) if K90 = 3,
4 or 5. The digital Hall effect sensor is connected to these 3 inputs (refer to the corresponding
'Hardware
Manual'
for more information).
Caution:
On the
DSCDM
, these 3 inputs are
only
dedicated to a digital Hall effect sensor and
cannot
be
used as a standard digital input (DIN) as it is the case on the DSC2P, DSC2V and DSCDP.
Monitoring M48 allows the reading of the counter of the digital Hall effect sensor:
On the following graph, the Hall signals and the sine voltages between the motor phases (V1-2, V2-3 and
V3-1) are displayed:
Available on
DSC2P
DSC2V
DSCDP
DSCDL
DSCDM
M
Name
Comment
M48
Digital Hall effect sensor signal
Gives the value of the digital Hall effect sensor's counter only if K90 = 3, 4 or 5
(DSCDL)
unstable balance point
stable balance point
If the motor is in an unstable
position, it will automatically move
to a stable position.
If the motor is in a stable
position, it will follow the stable
position, which has moved.
Pointers motion
⇒
balance positions motion
Содержание DSC Series
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