ABB ACS850 series, Firmware Manual

Page: 16 / 260

16 Start-up
Multimotor drives
This section applies only to drive systems in which multiple motors are connected to the drive.
Check that the motors have the same relative slip (only
for asynchronous motors), nominal voltage and number of
poles. If the manufacturer motor data is insufficient, use
the following formulas to calculate the slip and the number
of poles:
where
p = number of pole pairs (= motor pole number / 2)
f
N
= motor nominal frequency in Hz
n
N
= motor nominal speed in rpm
s = motor slip in %
n
S
= motor synchronous speed in rpm.
Set the sum of the motor nominal currents. 99.06 Mot nom current
Set the nominal motor frequencies. Frequencies must be
the same. 99.08 Mot nom freq
Set the sum of the motor nominal powers.
If the motor powers are close to each other or the same
but the nominal speeds vary slightly, parameter
99.09 Mot
nom speed can be set to an average value of the motor
speeds.
99.10 Mot nom power
99.09 Mot nom speed
ID RUN (motor identification run)
WARNING! With Normal or Reduced ID run the motor will run at up to
approximately 50…100% of the nominal speed during the ID run. ENSURE THAT
IT IS SAFE TO RUN THE MOTOR BEFORE PERFORMING THE ID RUN!
Note: Ensure that possible Safe Torque Off and emergency stop circuits are closed during the
ID run.
s
n
S
n
N
–
n
S
-----------------
100%
⋅
=
n
s
f
N
60
⋅
p
---------------- =
p Int
f
N
60
⋅
n
N
---------------
⎝ ⎠
⎛ ⎞
=