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222
Affinity User Guide
www.controltechniques.com Issue Number: 5
1: Torque control
The torque demand is given by the sum of the torque reference and
the torque offset, if enabled. The speed is not limited in any way,
however, the drive will trip at the overspeed threshold if runaway
occurs.
11.21.9 Stop modes
Open-loop
Stopping is in two distinct phases: decelerating to stop, and stopped.
Once modes 3 or 4 have begun the drive must go through the ready
state before being restarted either by stopping, tripping or being
disabled.
If this parameter is set to DiASbLE (5), the disable stopping mode is
used when the run command is removed. This mode will allow the drive
to be started immediately by re-applying the run command. However, if
the drive is disabled by removing the drive enable (i.e. via the Enable
input or Pr
6.15
Drive enable
) then the drive cannot be re-enabled for 1s.
RFC
Only one stopping phases exists and the ready state is entered as soon
as the single stopping action is complete.
Defines the current level used during DC injection braking as a
percentage of motor rated current as defined by Pr
5.07
.
Defines the time of injection braking during phase 1 with stopping modes
3 and 4, and during phase 2 with stopping mode 2 (see Pr
6.01
).
11.21.10 Line power supply loss modes
0: diS
There is no line power supply loss detection and the drive operates
normally only as long as the DC bus voltage remains within specification
(i.e. >Vuu). Once the voltage falls below Vuu an under-voltage ‘UV’ trip
occurs. This will reset itself if the voltage rises above Vuu Restart, as
stated in the table below.
1: StoP - Open-loop
The action taken by the drive is the same as for ride through mode,
except the ramp down rate is at least as fast as the deceleration ramp
setting and the drive will continue to decelerate and stop even if the line
power supply is re-applied. If normal or timed injection braking is
selected the drive will use ramp mode to stop on loss of the supply. If
ramp stop followed by injection braking is selected, the drive will ramp to
a stop and then attempt to apply dc injection. At this point, unless the line
power supply has been restored, the drive is likely to initiate a trip.
1: StoP - RFC
The speed reference is set to zero and the ramps are disabled allowing
the drive to decelerate the motor to a stop under current limit. If the Line
power supply is re-applied while the motor is stopping any run signal is
ignored until the motor has stopped. If the current limit value is set very
low level the drive may trip UV before the motor has stopped.
2: ridE.th
The drive detects line power supply loss when the DC bus voltage falls
below Vml
1
. The drive then enters a mode where a closed-loop
controller attempts to hold the DC bus level at Vml
1
. This causes the
motor to decelerate at a rate that increases as the speed falls. If the line
power supply is re-applied it will force the DC bus voltage above the
detection threshold Vml
3
and the drive will continue to operate normally.
The output of the line power supply loss controller is a current demand
that is fed into the current control system and therefore the gain Pr
4.13
and Pr
4.14
must be set up for optimum control. See parameters Pr
4.13
and Pr
4.14
for set-up details.
6.01
Stop mode
RW
Txt
US
OL
Ú
COASt (0), rP (1), rP.dcl
(2), dcl (3), td.dcl (4),
diSAbLE (5)
Ö
rP (1)
RFC
COASt (0), rP (1),
no.rP (2)
Stopping
Mode
Phase 1
Phase 2
Comments
0: Coast
Inverter
disabled
Drive cannot
be re-enabled
for 1s
Delay in phase 2 allows
rotor flux to decay
1: Ramp
Ramp down
to zero
frequency
Wait for 1s with
inverter
enabled
2: Ramp
followed
by DC
injection
Ramp down
to zero
frequency
Inject DC at
level specified
by Pr
6.06
for
time defined by
Pr
6.07
3: DC
injection
with zero
speed
detection
Low
frequency
current
injection
with
detection of
low speed
before next
phase
Inject DC at
level specified
by Pr
6.06
for
time defined by
Pr
6.07
The drive automatically
senses low speed and
therefore it adjusts the
injection time to suit the
application. If the injection
current level is too small
the drive will not sense
low speed (normally a
minimum of 50-60% is
required).
4: Timed
DC
injection
braking
stop
Inject DC at
level
specified by
Pr
6.06
for
time
specified by
Pr
6.07
5: Disable
Inverter
disabled
Allows the drive to be
immediately disabled and
then re-enabled again
immediately if required.
Stopping Mode
Action
0: Coast
Inhibits the inverter
1: Ramp
Stop with ramp
2: No ramp
Stop with no ramp
6.06
Injection braking level
RW
Uni
RA
US
OL
Ú
0.0 to 150.0 %
Ö
100.0
6.07
Injection braking time
RW
Uni
US
OL
Ú
0.0 to 25.0 s
Ö
1.0
6.03
Line power supply loss mode
RW
Txt
US
Ú
diS (0), StoP (1), ridE.th (2)
Ö
diS (0)
Содержание Affinity
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