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14
Affinity User Guide
www.controltechniques.com Issue Number: 5
2.3.1 Typical short term overload limits
The maximum percentage overload limit changes depending on the selected motor. Variations in motor rated current, motor power factor and motor
leakage inductance all result in changes in the maximum possible overload. The exact value for a specific motor can be calculated using the
equations detailed in Menu 4 in the
Advanced User Guide
.
Typical values are shown in the table below for RFC mode (RFC) and open loop (OL) modes:
Table 2-5 Typical overload limits for size 1 to 6
Generally the drive rated current is higher than the matching motor rated current allowing a higher level of overload than the default setting as
illustrated by the example of a typical 4 pole motor.
The time allowed in the overload region is proportionally reduced at very low output frequency.
The maximum overload level which can be attained is independent of the speed.
2.4 Model number
The way in which the model numbers for the Affinity range are formed is
illustrated below.
2.5 Operating modes
The Affinity is designed to operate in any of the following modes:
1. Open loop mode
Open loop vector mode
Fixed V/F mode (V/Hz)
Quadratic V/F mode (V/Hz)
2. RFC mode
2.5.1 Open loop mode
The drive applies power to the motor at frequencies varied by the user.
The motor speed is a result of the output frequency of the drive and slip
due to the mechanical load. The drive can improve the speed control of
the motor by applying slip compensation. The performance at low speed
depends on whether V/F mode or open loop vector mode is selected.
For further details refer to section 8.1.1
Open loop vector mode
The voltage applied to the motor is directly proportional to the frequency
except at low speed where the drive uses motor parameters to apply the
correct voltage to keep the flux constant under varying load conditions.
Typically 100% torque is available down to 1Hz for a 50Hz motor.
Fixed V/F mode
The voltage applied to the motor is directly proportional to the frequency
except at low speed where a voltage boost is provided which is set by
the user. This mode can be used for multi-motor applications.
Typically 100% torque is available down to 4Hz for a 50Hz motor.
Quadratic V/F mode
The voltage applied to the motor is directly proportional to the square of
the frequency except at low speed where a voltage boost is provided
which is set by the user. This mode can be used for running fan or pump
applications with quadratic load characteristics or for multi-motor
applications. This mode is not suitable for applications requiring a high
starting torque.
2.5.2 RFC mode
Rotor flux control provides closed loop control without the need for
position feedback by using current, voltages and key motor parameters
to estimate the motor speed. It can eliminate instability traditionally
associated with open loop control such as operating large motors with
light loads at low frequencies.
For further details, refer to section 8.1.2
Operating mode
RFC mode from cold
RFC mode from 100% Open loop from cold Open loop from 100%
Overload with motor rated current = drive rated current
110% for 165s
110% for 9s
110% for 165s
110% for 9s
NOTE
Product line
BA: Affinity Building
product
Automation
Frame size
Voltage rating
0:
2:
4:
5:
6:
Voltage independent
200V to 240V
380V to 480V
500V to 575V
500V to 690V
Current rating step
BA 6
4
0
1 -E12/E54
Variant designator
None:
E12/E54:
Standard drive
UL Type 12 (NEMA 12) / IP54
UL Type 12 (NEMA 12) / IP66
E12/E66:
Содержание Affinity
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