Siemens SINAMICS DCM Operating Instructions Manual page 254

Control module for variable-speed dc drives
Hide thumbs Also See for SINAMICS DCM:
Table of Contents

Advertisement

Commissioning
8.8 Manual optimization
Overall optimization of the armature circuit
• Checking the precontrol characteristic
• Checking the step response
254
- If "OPERATION ENABLE" has been applied and the "SHUTDOWN"
command is entered, an armature current of approximately 0% will now flow.
• Calculate the armature circuit resistance p50110 from the armature current and
armature voltage
- Gradually increase the main setpoint (shown at r52011) until the actual
armature current value (r50019 as a % of the unit's rated armature current)
reaches approximately 70% of the motor's rated armature current.
- Calculate the armature circuit resistance:
Ra[Ω] = r50038 / (r50019 × p50100) = armature voltage [V] / armature
current [A]
• Calculate the armature circuit inductance p50111 from the armature current at the
transition point from discontinuous to continuous current
- Make an oscilloscope trace of the armature current.
- Starting from 0, gradually increase the main setpoint (shown at r52011) until
the armature current reaches the transition point from discontinuous to
continuous current.
- Calculate the armature circuit inductance using the following formula:
La[mH] = 0.4 × r50015 / (r50019 × p50100)
= armature voltage [V] / armature current at the transition point from
discontinuous to continuous current [A]
Procedure
-
Set the function generator to a triangular waveform (0 % to 100 %), period =
10000 ms
-
Supply point: p50601[4] (see function diagram 6855)
-
Set p50082 = 0 (field off)
-
p50153 = 3 (influence of EMF disabled)
-
Record signals r52121 (output, precontrol) and r52110 (output, armature current
controller)
-
The parameters of the precontrol (Ra [p50110], La [p50111] and λa [p51591])
are correctly set if the armature current controller output has the lowest possible
value (e.g. less than 5 %) over the complete setpoint range.
Procedure
-
Set the function generator to a squarewave, with
step height = e.g. 5 %
offset = various values, e.g. 80 %
period = 1000 ms
pulse width = 500 ms
-
Supply point: p50601[4] (see function diagram 6855)
-
Set p50082 = 0 (field off)
SINAMICS DCM Control Module
Operating Instructions, 06.2010, C98130-A7067-A1-02-7619

Advertisement

Table of Contents
loading

Table of Contents