70 JVL Industri Elektronik A/S - User Manual - Integrated Stepper Motors MIS23x, 34x, 43x
5.1 Adjusting the motor current
The current supplied to each of the step motor’s phases can be adjusted for standby and
running currents by changing the values of standby and running currents under “Driver
parameters” in the MacTalk program. The register is also accessible in general through
the serial interface.
The electronics automatically switches between the two currents by detecting the pres-
ence of step-pulses. If a rising edge is detected at the step-clock, the “Move current” is
selected. If no rising edge is detected during the period specified by “Standby time” at
the step-clock input, the current is automatically switched back to “Standby current”.
Values for the two currents are typically adjusted so that the Operating Current is signif-
icantly higher than the Standby Current, since the motor must be supplied with more
power to drive its load during acceleration and constant operation than when it is sta-
tionary.
Note that the maximum Standby Current normally will be set to 50% or lower of the
maximum current for the actual driver type. The only overriding consideration that must
be made in the adjustment of motor phase currents is that the thermal output of the mo-
tor must not exceed the maximum operating temperature of the step motor.
Current overview
If a MIS232 motor is used and the current is set to 3000 mA, the motor will be able to
deliver a torque of 1.6 Nm at low speed. If the current is set to 1000 mA, the motor will
be able to deliver 0.53Nm.
See Run_Current, page 124 for information about Running Current and Standby_Current,
page 125 for information about Standby Current.
MIS231 MIS232 MIS234 MIS340 MIS341 MIS342 Unit
Standby Current 0-3000 0-3000 0-3000 0-9000 0-9000 0-9000 mA RMS
Running Current 0-3000 0-3000 0-3000 0-9000 0-9000 0-9000 mA RMS
Holding Torque 0-1.2
[170] 0-1.9[269] 0-3.0[425] 0-3.0[425] 0-6.1[863] 0-9.0[1274] Nm [Oz-In]
TT2 2 0 8 G B
Clk
Running
Standby
0
Standby time
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