Operation & Software Manual
92
Direct Drives & Systems
Chapter C: System functions
ETEL Doc. - Operation & Software Manual # DSC2P 903 / Ver. F / 3/6/05
SLS
(
S
earch
L
imit
S
troke) command is:
Remark:
A homing must be done (with IND command) before sending the SLS command.
The SLS command is available only when K61 = 1.
Note:
With K36 = 1 the target of a POS / STA / STI movement is limited by parameters K34 and K35
without generating an error.
12.4.2 Current limits
An overcurrent in the motor phases can destroy it. Parameters
K83
,
K84
and
K85
help to avoid it. Parameter
K60
will limit the force/torque reference (theoretical) at the position regulator's output. Thus, the current in the
motor should also be limited. However, the real force/torque in the motor may oscillate and go over parameter
K60.
Parameter K83 protects the motor from an
instantaneous overcurrent
. If the motor current gets higher than
the value of parameter K83, the controller changes to error mode.
OVER CURRENT1
(M64=2) or
OVER
CURRENT2
(M64=3) message is displayed.
Reaching the current in monitoring
M82 is not permitted
; this value is a theoretical measurable value, for
calculations only! (refer to
).
Parameters K84 and K85 protect the motor from a
too high current during a too long time
, whose
energy
could raise the temperature high enough to burn the motor. This i
2
t (energy) limit is given by parameter K85.
When the instantaneous current value increases over the value of parameter K84, an integrator is activated.
As long as the current stays over the value of parameter K84, it is integrated, but when it passes under it the
integrator empties progressively. If the integral value is higher than parameter K85, the controller displays an
I2T ERROR
error (M64=4).
Command format
Comments
SLS.<axis>
Searches the limit stroke according to parameter K145. Limit position is returned in monitorings M36 and
M37 (given in [upi]). K47 is taken into account by SLS command but not in M36 and M37.
Available on
DSC2P
DSC2V
DSCDP
DSCDL
DSCDM
K
Name
Comment
Units
K83
Motor
overcurrent limit
If the current in the phases is > K83, the
OVER CURRENT
error appears (M64=2 or 3)
[ci]
K84
I2t rms current limit The integration starts when the motor current is > K84
-
K85
I2t time limit
If the integral value is > K85, the
I2T ERROR
error (M64=4) appears
-
K60
Force/torque limit
Max. force/torque reference at the position regulator output (will limit the current in the motor)
[foi]
[toi]
M
Name
Comment
Units
M67
I2t integration
limit test
When monitoring M67 is greater than parameter K85, the controller generates an
I2T ERROR
error (M64=4)
-
M82
Controller
maximum current
Maximum current [A] = M82/100. Should never be reached! This theoretically maximum value
is used for calculations only
[A]*100
MOTOR
If K36=2, an error appear
If K36=2, an error appear
K35
K34