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The output frequency of the inverter, and hence the speed of the motor, can be controlled by any of the following
means (see 5.3.2, parameter P04 and also Figure 3) :
(1)
Connection of 0–10 V control voltage (terminals X11.7/8).
(2)
Connection of a 0–20 mA current loop control input (terminals X11.9/10).
(3)
Connection of a 4–20 mA current loop control input (terminals X11.9/10).
(4)
Connection of a 5 kΩ control potentiometer (terminals X11.6/7/8).
(5)
By digital parameterisation via the push–buttons fitted to the inverter, or via equivalent external
push–buttons connected to terminals X11.17 and X11.18.
(6)
Via the serial I/O connection (see section 7) .
1.3 Monitoring Facilities
The following monitoring facilities are available:
(1)
Seven–segment display for output frequency, output current, fault indication or parameterisation.
This is viewed through a window in the cover.
(2)
A 0–10 V analogue signal, proportional to output frequency or output current.
(3)
A changeover relay, normally energised when the drive is connected to a suitable input supply. The
relay is de–energised when a fault (see section 5) is indicated.
(4)
The drive may be interrogated via the serial I/O connection (see section 7) .
1.4 Motor Characteristics
The inverter can be adjusted to suit individual motor characteristics in the ways described in 1.4.1 and 1.4.2.
1.4.1 Voltage/Frequency Characteristic
Six voltage/frequency characteristic curves are available plus one programmable curve (see Figure 2) . They are
intended for the following applications:
Curve 0:
V
/50 Hz (constant torque)
N
For standard 50 Hz induction motors with linear speed/torque characteristics.
Curve 1:
V
/60 Hz (constant torque)
N
For standard 60 Hz induction motors with linear speed/torque characteristics.
Curve 2:
V
/87 Hz (constant torque)
N
For delta–connection of standard induction motors designed for star–connection of 50 Hz input
voltage. This increases the speed range over which constant motor torque can be achieved.
Curve 3:
V
/120 Hz (constant torque)
N
For applications where a constant torque is required over the full operating speed range 0.1 to
120 Hz.
Curve 4:
V
/50 Hz (torque proportional to speed
N
For operation of 50 Hz motors driving loads where torque is proportional to (speed)
examples of such loads are fans and pumps.
Curve 5:
V
/60 Hz (torque proportional to speed
N
For operation of 60 Hz motors driving loads where torque is proportional to (speed)
Curve 6:
Programmable (not shown in Figure 2)
The curve type and corner frequency may be selected by the user.
1/3
1.5
)
1.5
)
English
1.5
. Typical
1.5
.
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