120
E300 Installation and Commissioning Guide
Issue Number: 1
A22
(
Motor Rated Speed
B07
)
Open-loop
This is the speed at which the motor will rotate when supplied with its base frequency at the rated voltage under rated load conditions
(synchronous speed - slip speed). Entering the correct value into this parameter, allows the drive to increase the output frequency as a function of
load in order to compensate for speed drop. If slip compensation is required, this parameter should be set to the value from the motor name plate
which should give the correct rpm for a hot machine. Sometimes it will be necessary to adjust this during commissioning, as the nameplate value may
be inaccurate. Slip compensation is disabled if the motor rated speed is set to 0 rpm or to the synchronous speed or if
Slip Compensation Enable
(
B10
) = Off (0).
RFC-A
Rated load rpm is used with motor rated frequency to determine the full load slip of the motor which is used by the vector control algorithm.
Incorrect setting of this parameter can result in the following:
•
Reduced efficiency of motor operation
•
Reduction of maximum torque available from the motor
•
Failure to reach maximum speed
•
Over-current trips
•
Reduced transient performance
•
Inaccurate control of absolute torque in torque control modes
The nameplate value is normally the value for a hot machine, however, some adjustment may be required when the drive is commissioned if the
nameplate value is inaccurate. The rated full load rpm can be optimized by the drive (refer to
Motor Parameter Adaptive Control
(
B25
) in the
E200
Design Guide
).
RFC-S
The motor rated speed is not used by the motor control algorithms, but it is used by the motor thermal protection system. The units for motor
rated speed are always rpm The nameplate value is normally the value for a hot machine. Setting this parameter to 0 disables the motor thermal
protection. For further details on the motor thermal protection system refer to parameter
Thermal Protection Mode
(
B19
) in the
E200 Design Guide
.
A23
(
Open Loop Control Mode
B09
)
(
RFC-S Action On Enable
B09
)
The open loop control mode defines the drive output mode. It should be noted that the maximum output voltage of the drive is limited to a level just
below DC bus voltage (
J65
)
/
√
2 . Therefore if the drive is being supplied via its own rectifier input stage, the output voltage is limited to a level just
below that of the supply voltage. If the drive is operating in voltage mode, the output voltage is limited to
A19
(
Motor Rated Voltage
B03
)
or the
maximum possible output voltage whichever is the lowest. If (
B45
)
= On (1) the maximum possible output voltage can be
increased. For further details refer to the
E200 Design Guide
.
0
: Ur S (Resistance compensation, stator resistance measured at each start) Resistance compensation is a form of stator flux oriented sensorless
motor control. A linear frequency to voltage characteristic is used where the drive output voltage is increased from 0 V to
A19
(
Motor Rated Voltage
B03
) as (
J60
) increases from 0 Hz to
A21
B06
).
When the output frequency is above the motor rated frequency, the output voltage is limited to
A19
(
B03
). Vector based stator
resistance compensation is applied below
A21
(
B06
) / 4 and is then tapered out from (
A21
B06
) / 4
to (
A21
B06
) / 2. This method controls the flux level correctly in the motor in the steady state, provided the correct value of
B34
) is used. The stator resistance is measured each time the drive is started.
A22 {B07}
Motor Rated Speed
RW
Num
ND
US
OL
Ú
0 to 33000 rpm
Ö
50 Hz default: 1500 rpm
60 Hz default: 1800 rpm
RFC-A
50 Hz default: 1450 rpm
60 Hz default: 1750 rpm
RFC-S
0.00 to 33000.00 rpm
3000.00 rpm
A23 {B09}
Open-Loop: Open Loop Control Mode
{B09}
RFC-S: Action On Enable
RW
Txt
US
OL
Ú
UrS (0) Ur (1) Fixed (2)
Ur Auto (3) Ur I (4)
Ö
Ur I (4)
RFC-A
RFC-S
Disabled (0), Short (1),
Short Once (2),
Long (3), Long Once (4)
Disabled (0)
Value
Text
0
UrS
1
Ur
2
Fixed
3
Ur Auto
4
Ur I
Содержание E300 Series
Страница 211: ......
Страница 212: ...0479 0005 01 ...