IMO Precision Controls Jaguar VXS, Руководство пользователя

Страница: 31 / 67

The PWM carrier frequency is adjustable
from 0.75kHz to 15.6kHz.
Setting Ranges
0 = 0.75kHz
and 1 = 1kHz
…in unit steps to…
15 = 15.6kHz
The higher the PWM frequency, the more
closely the output current wave approximates to
a pure sine wave. Audible noise at the motor is
lower at the higher PWM frequencies, but care
should be taken to allow for higher losses with-
in the inverter and increased RF emissions from
the motor cables.
Refer also to Chapter 10.
Function 13 controls the number of times
the inverter will automatically attempt to
restart after a trip caused by overcurrent or
overvoltage, not by any other cause.
The maximum number of attempts is 10.
Factory-set default value is 0 — no restart.
There are four modes of Function 14:
0 Inactive. The motor does not restart.
The LED display will indicate an LU
(undervoltage trip) when the voltage
falls below the trip level. This is the
factory-set default.
1 Inactive. The motor does not restart.
The LED display will indicate an LU
(undervoltage trip) when the voltage is
restored.
2 Active. The motor restarts at the same
output frequency as when the trip
occurred.
3 Active. The motor restarts at starting
frequency, Function 30.
For Motor 1 only. Refer also to Function 66.
There are five modes of the Function 15:
0 Inactive.
1 or 3 Active. The factory-set default — suit-
able for ‘standard’ 4-pole induction
motors.
2 or 4 Active. For inverter-rated motors.
Characteristic curves for the settings of
Function 15 = 1, 2, 3, 4 are shown above.
29
15 Thermal overload 1 — mode
13 Restart attempts
14 Restart mode
12 PWM carrier frequency
WARNING Automatic restarting may be
a hazard to personnel working in the
vicinity of the motor or the driven
machine. It is recommended that
appropriate notices are displayed to
prevent danger.
WARNING If Function 14 is set to the
value 2 or 3, the inverter will restart
immediately
when power is
restored.
Oper.
time
(sec)
50
≥
50Hz
0 100 150 200
20Hz
0.5Hz
Function 15
= 1 or 3
Function 15 = 1
Function 15 = 3
1
150
300
Oper.
time
(sec)
50 0 100 150 200
Function 15
= 2 or 4
Function 15 = 2
Function 15 = 4
1
150
300
Function 15 = 1 or 3
Function 15 = 2 or 4
%
%
% set current (A)
% set current (A)