Siemens SIMOVERT MASTERDRIVES Betriebsanleitung Seite 244

Parameterizing Steps
Torque reference
value
Reference power
value
Reference current
value
NOTE
9-10
Since the torque signals and parameters in the control system are
always specified and displayed as a percentage, the ratio of the
reference torque (P354) to the rated motor torque (P113) is always
important for accuracy. If both values are the same, a display value of
100 % corresponds exactly to the rated motor torque, irrespective of the
values actually entered in P354 and P113.
For purposes of clarity, however, it is advisable to enter the true rated
torque of the drive in P113 (e.g. from catalog data).
P
(mot, rated)
W
=
P 113
2 ⋅ π ⋅ n(mot, rated)
60
The reference power (in W) is calculated from the reference torque and
reference speed:
P 354 ⋅ P 353 ⋅
=
P
W , ref
60
Power values for the control system are also always specified as a
percentage referred to the specified reference power. The ratio of
P / P can be used for conversion to the rated motor
W,ref mot,rated
power.
⋅ ⋅ ⋅ π
P 113 2
=
P
mot , rated
60
If the reference torque P354 is increased, for example, the reference
current P350 must be increased by the same factor, because the
current increases at higher torque.
Setting and visualization parameters in engineering units (e.g. Imax
in A) must also be no more than twice the reference value.
If the reference quantities are changed, the physical value of all
parameters specified as a percentage also changes; that is all the
parameters of the setpoint channel, as well as the maximum power for
the control system (P258, P259) and the static current for frequency
control (P278, P279).
If the reference values and the rated motor values are identical (e.g.
following quick parameterization), signal representation (e.g. via
connectors) up to twice the rated motor values is possible. If this is not
sufficient, you must change to the "Drive setting" menu (P060 = 5) to
change the reference quantities.
2 π ⋅
P 108
Operating Instructions
05.2003
6SE7087-6JP60 Siemens AG
SIMOVERT MASTERDRIVES