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80
Unidrive User Guide
www.controltechniques.com Issue Number: 9
This voltage is used as the level for both standard ramp modes. If hold
mode is used and this is set too low the drive will never stop, and if it is
too high and no braking resistor is used the drive may trip on OV (DC
bus over voltage). If Standard ramp with P control (Pr
2.04
= Stnd.Ct (2))
is used and Pr
2.08
is set too low the machine will coast to rest, and if it
is set too high and no braking resistor is used it may trip on OV. The
minimum level should be greater than the voltage produced on the DC
bus by the highest supply voltage.
Normally the DC bus voltage will be approximately the rms supply
voltage x
√
2.
The values of Pr
0.27
and Pr
0.28
affect the dynamic performance of the
drive in the following conditions:
•
Operation in current limit
•
Braking when Pr
0.15
Ramp mode selector
is set at Stnd.Ct (default)
•
Loss of AC supply when Pr
6.03
AC supply loss mode selector
is set
at ridE.th.
information.
on page 198 for details of the trip
codes.
If the drive trips, the trip code representing the cause of the trip is logged
in Pr
0.30
. Pr
0.30
continues to display this trip until the drive trips with a
different trip code.
If this parameter is set to zero then no auto-reset attempts are made.
Any other value will cause the drive to automatically reset following a trip
for the number of times programmed. Pr
10.35
defines the time between
the trip and the auto reset. The reset count is only incremented when the
trip is the same as the previous trip, otherwise it is reset to 0. When the
reset count reaches the programmed value, any further trip of the same
value will not cause an auto-reset.
If there has been no trip for 5 minutes then the reset count is cleared.
Auto reset will not occur on an External trip (Et).
This parameter defines the time between a trip and an auto reset subject
to the 10s minimum trip time for IGBT over-current trips (OI.AC and OI.br
trips).
Use Pr
0.32
to select the required serial communications mode as
follows:
When the total current level is above 105% motor rated current (Pr
5.07
x 1.05) the overload accumulator increases, until it reaches 100% when
the drive will give an Ixt trip or apply a restriction on the current limit. The
level of the accumulator is given by:
Accumulator = (I
2
/ (Pr
5.07
x 1.05)
2
) x (1 - e
-t/
τ
) x 100%
If the motor rated current parameter (Pr
5.07
) is modified the overload
accumulator is reset to zero. This allows the drive to be used with more
than one motor of different ratings without producing overload trips when
the drive has been running with a large motor and then a smaller motor
is connected.
0.26 {2.08}
Standard ramp voltage
RW
Uni
Ú
200V drive: 0 to 400 V
400V drive: 0 to 800 V
Ö
200V drive: 375
400V drive: EUR> 750, USA> 775
Care should be taken in the setting of Pr
2.08
. It is
recommended that the setting should be at least 50V higher
than the maximum expected level of the DC bus voltage. If
this is not done, the motor may fail to decelerate on a STOP
command.
0.27 {4.13}
Current-loop proportional gain
RW
Uni
Ú
0 to 30,000
Ö
20
0.28 {4.14}
Current-loop integral gain
RW
Uni
Ú
0 to 30,000
Ö
40
0.29 {5.05}
DC bus voltage
RW
Uni
P
Ú
200V drive: 0 to 415 V
400V drive: 0 to 830 V
Ö
0.30 {10.20}
Last trip
RW
Txt
S
P
Ú
0 to 200 V
Ö
0.32 {10.34}
Number of auto-reset attempts
RW
Uni
Ú
0 to 5
Ö
0
WARNING
0.33 {10.35}
Auto-reset time delay
RW
Uni
Ú
0.0 to 25.0 s
Ö
1.0
0.35 {11.24}
Serial comms. mode
RW
Txt
R
P
Ú
ANSI 2 (0), ANSI 4 (1),
OUtPUt (2), INPUt (3)
Ö
ANSI 4 (1)
ANSI 2 (0) ANSI protocol, two-wire
ANSI 4 (1) ANSI protocol, four-wire
Use the following modes to transfer the value of a parameter in one
drive to a parameter in another drive:
OUtPUt (2)
Transmit the value of the parameter specified by the setting of
Pr
11.27
Serial comms. source / destination parameter
(CT protocol)
INPUt (3)
Apply the received value to the parameter specified by the setting
of Pr
11.27
Serial comms. source / destination parameter
(CT
protocol)
0.48 {4.19}
Overload accumulator
RO
Uni
P
Ú
0 to 100 %
Ö
NOTE
Содержание Unidrive 1 Series
Страница 208: ......
