6
-4
Carrier
Frequency
When
selecting the carrier frequency, observe the following precautions items.
•
When
using a device with C6-01 set to 1 (VT), adjust the carrier frequency according to the cases shown
below.
If
the wiring distance between Inverter and motor is long: Set the carrier frequency low. (Use the following
values
as guidelines.
If
speed and torque are inconsistent at low speeds: Set the carrier frequency low.
If
Inverter noise is affecting peripheral devices: Set the carrier frequency low.
If
leakage current from the Inverter is large: Set the carrier frequency low.
If
metallic noise from the motor is large: Set the carrier frequency high.
Carrier
frequency upper limit depends on the Inverter capacity. Refer to Factory Settings that Change with the
Inverter
Capacity (o2-04) on page 5-85.
•
When
using V/f control or V/f control with PG, you can vary the carrier frequency to match the output fre-
quency,
as shown in the following diagram, by setting C6-03 (Carrier Frequency Upper Limit), C6-04
(Carrier
Frequency Lower Limit), and C6-05 (Carrier Frequency Proportional Gain).
Fig 6.1
•
With
vector control, the carrier frequency is fixed by the Carrier Frequency Upper Limit in C6-03 if user-
set,
or by the carrier frequency set in C6-02.
•
To
fix the carrier frequency, set C6-03 and C6-04 to the same value, or set C6-05 to 0.
•
If
the settings are as shown below, OPE11 (Data setting error) will occur.
If
Carrier Frequency Proportional Gain (C6-05) > 6 and C6-03 < C6-04.
If
C6-01 = 0 and Carrier Frequency Selection C6-02 is set from 2 to E.
If
C6-01 = 1 and Carrier Frequency Selection C6-02 is set from 7 to E.
Wiring
Length
50
m
or
less
100
m
or
less
Over
100
m
C6-02
(carrier frequency)
setting
0
to 6 (15 kHz)
0
to 4 (10 kHz)
0
to 2 (5 kHz)
C6-03
C6-04
Output frequency
Output frequency
×
C6-05
×
K*
E1-04
Max. Output Frequency
Carrier Frequency
* K is the coefficient determined by
the set value in C6-03.
C6-03
≥
10.0 kHz: K=3
10.0 kHz > C6-03
≥
5.0 kHz: K=2
5.0 kHz < C6-03: K=1
Summary of Contents for SYSDRIVE 3G3RV
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