Santerno Sinus Penta - “VTC” Control Algorithm

SINUS PENTA
PROGRAMMING GUIDE
42/486
7.2. “VTC” Control Algorithm
1) Wiring:
Follow the instructions stated in the “Caution Statements” and “Installation” sections in the Sinus
Penta’s Installation Guide.
2) Power on:
Power on the drive and do not close the link to the ENABLE-A and ENABLE-B inputs to prevent
the motor from running. Check if the display/keypad turns on.
3) Parameter
setting:
The equipment startup is made easier by the START-UP MENU, which is a wizard for the setup of
the main motor control parameters.
From the START-UP MENU, set the following:
1. The real power supply voltage in C008
. It is possible to select the rated mains voltage
range or the power supply from a DC-bus stabilized by a Regenerative Penta;
2. The control algorithm as VTC (Vector Torque Control) in C010;
3. The motor ratings by way of:
• C015 (fmot1) rated frequency
• C016 (rpmnom1) rated rpm
• C017 (Pmot1) rated power
• C018 (Imot1) rated current
• C019 (Vmot1) rated voltage
• C029 (Speedmax1) max. allowable speed.
CAUTION: It is not advi
sable to set rated motor power and current lower than 50% of
the drive size. This would adversely affect the motor control performance.
4) Setting no-load
current C021
If the motor current is known, set C021 (I
0
) to the value of I
0
expressed as a percentage of the
rated motor current.
If the no-
load current of the motor is not known but the motor can rotate freely without any
connected load, start the motor in IFD mode at nominal rpm, read out the current value from the
Motor Measures Menu and use that value as the first trial value for I
0
. For example, if the rated
motor current is C018 = 133A and M026 = 36A, set C021= 36/133=27%.
NOTE: If the motor must run at a higher speed than the rated speed (field weakening
mode) read out the no-load current value at rated speed in any case.
Lastly, if the no-load current of the motor is not known and the motor cannot rotate under no-load
conditions, you can use the first I
0
trial value automatically computed by the Penta drive during the
tuning procedure described in step 5).
NOTE: Each time the tuning procedure in step 5) is carried out with no-
load current
parameter C021 (I
0
) = 0, the Penta drive will automatically enter a value based on the motor
current ratings.
5) Autotune of
motor parameters
(motor stopped)
With the ENABLE-A and ENABLE-B commands open, access the AUTOTUNE MENU and set
I073=[1: Motor Tune] and I074=[0: Motor Params]. Press ESC to confirm the new values.
Close the ENABLE-A and ENABLE-B commands and wait until tune is complete (Warning “W32
Open Enable” is displayed).
The drive has now computed and saved the following parameter values:
- C022 (stator resistance) through motor measurements
- C023 (leakage inductance) through motor measurements
- If C021=0, a first trial value for no-load current C021
is computed based on the motor
ratings
- C024 (mutual inductance)
- If C025=0, a first trial value for rotor time constant C025 is computed based on the motor
ratings
If alarm “A097 Motor Wires KO“ trips, check the motor wiring. If alarm “A065 Autotune KO” trips,