Notes On Use Of Speed Control Mode - Sanken SVCO6 Instruction Manual

7-3 Description of Functions

Notes on use of speed control mode:

Note 1: When setting the control mode of speed sensorless vector control, the following conditions must be met.
1. One inverter to one motor.
2 .The motor must be a Sanken designated 2, 4, 6 or 8-pole 3-phase induction motor or a similar motor.
3 .To inverter rated, motor capacity that can drive is one level lower or 2 levels lower the motor or standard applicable
motor. (Only 8 pole motors, 3 levels lower motor can be chosen.)
4 .The wiring length between the inverter and the motor shall be less than 30 m. If the wiring length exceeds 30 m,
conduct auto tuning of the motor parameters in advance using the auto tuning mode 2.
And, for vector control, the maximum wiring length shall be controlled within 100m.
Note 2: F5001 does not apply to the setting of 2 and 3 in Note 1, please set it correctly according to the above. And, the
inverter action and control characteristics cannot be guaranteed where the F5001's setting does not match ratings of
the connected motor.
Note 3: In the speed sensorless vector control mode, motor parameters, control frequency and voltage are used to drive the
motor, therefore control characteristics depend on motor parameters, and the best performance may not be
achieved depending on the motor. If motor characteristics, etc. are not mastered, auto measurement of motor
constant shall be carried out using auto tuning, and, the use of V/f mode of which the control characteristics do not
depend on motor parameters is recommended for control.
Note 4: When setting speed sensorless vector control mode, the following function codes shall be limited.
: setting inactive
F1004 - F1008
F1102 (Starting mode) =3 (started by starting frequency after DC braking): setting inactive. Starting excitation shall
be made by setting starting excitation time (F6006), and then the operation shall be started by starting frequency
according to the setting values of operation start frequency (F1104) and starting delay time (F1105).
F1103 (starting frequency): Although the setting is active, the minimum value is 0.2Hz in speed sensorless vector
control mode.
F1111 (braking method) =2: setting inactive. Braking excitation is made according to the setting of braking
excitation time (F6008) when stopped. The relation between output frequency and the settings of F1104 and F1112 is
handled in the same way with V/f mode.
F1113, F1114: Changed to F6007, F6008 for DC braking function.
F1701, F1703: Changed to F6001, F6003 for current limiting.
Note 5: Others
1 Upper frequency limit (F1007) sets the motor's rated speed as the synchronous speed, please set the frequency
specified by the motor's number of poles as the maximum value of frequency setting. The operation is a weak
magnetic-controlled constant power operation where the frequency setting values above rated frequency (F5003) are
used to drive motor, however, do not set the upper frequency limit too much higher than the rated frequency as it
may cause mechanical damage to the motor.
2 When output is stable, because the motor's speed is controlled to keep it constant, the frequency that the inverter
actually outputs constantly changes. In contrast to the case of the V/f mode, the set frequency and the output
frequency do not necessarily coincide when output is stable. Therefore, the output frequency may exceed the set
frequency.
3 ―Frequency arrival‖ and ―frequency matching‖ set by F1509 - F1511 determine when the output frequency reaches
or matches the set frequency. Therefore, for the ―frequency matching‖ function, set the frequency matching range
(F1508) to a few Hz because of the reason described in 2.
4 All values output to the operation panel's 7-segment monitor are based on the output frequency. In the frequency
display mode, the output frequency is displayed. In case of speed and no-units display, estimated speed is displayed
in speed sensorless vector control; and detected speed is displayed in speed sensor vector control.
5 In the use of speed sensor vector control mode, please correctly configure the basic settings of PG sensor. The motor
can not be normally controlled if incorrectly configured.
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