14-10 Mains Failure
Option:
Function:
If the ramp is quicker than the
ramp-down speed of the
application, the ramping generates
current. This results in a higher U
DC
,
which is limited using the brake
chopper/resistor brake.
14-11*1.35
UDC
0
UDC
Ref
A
B
C
D
E
F
130BC924.10
U
n [RPM]
t [
s
]
DC [V]
t [
s
]
A Normal operation
B Mains failure
C Kinetic back-up
D Mains return
E Kinetic back-up ramping to trip
F Trip
Illustration 4.44 Kinetic Back-Up,
Trip with Recovery where Mains
Returns below
Parameter 14-15 Kin. Back-up Trip
Recovery Level
, in this Illustration
a Quick Ramp is Used
14-11 Mains Fault Voltage Level
Range:
Function:
Size
related
*
[100 - 800 V] This parameter defines the
threshold voltage at which the
function in
parameter 14-10 Mains
Failure
is activated. Select the
detection level depending on the
supply quality. For a supply of 380
V, set
parameter 14-11 Mains Fault
Voltage Level
to 342 V. This results
in a DC detection level of 462 V
(
parameter 14-11 Mains Fault Voltage
Level
x1.35).
14-11 Mains Fault Voltage Level
Range:
Function:
NOTICE
Converting from VLT 5000 to
FC 300:
Even though the setting of the
mains voltage at mains fault is
the same for VLT 5000 and FC
300, the detection level is
different. Use the following
formula to obtain the same
detection level as in VLT 5000:
Parameter 14-11 Mains Fault
Voltage Level
(VLT 5000 level)
= value used in VLT 5000
x1.35/sqrt(2).
14-12 Response to Mains Imbalance
Operation under severe main imbalance conditions reduces the
lifetime of the motor. Conditions are considered severe if the
motor is operated continuously near nominal load (for example,
a pump or a fan running near full speed).
Option:
Function:
[0]
*
Trip
Trips the frequency converter.
[1]
Warning
Issues a warning.
[2]
Disabled
No action.
[3]
Derate
14-14 Kin. Back-up Time-out
Range:
Function:
60 s
*
[0 - 60 s]
This parameter defines the kinetic
back-up timeout when running on
low voltage grids. If the supply
voltage does not exceed the value
defined in
parameter 14-11 Mains
Fault Voltage Level
+5% within the
specified time, the frequency
converter then automatically runs a
controlled ramp-down profile
before stop.
14-15 Kin. Back-up Trip Recovery Level
Range:
Function:
Size
related
*
[ 0 -
60000.000
Reference-
FeedbackUnit]
This parameter specifies the kinetic
back-up trip recovery level. The unit
is defined in
parameter 0-02 Motor
Speed Unit
.
14-16 Kin. Back-up Gain
Range:
Function:
100 %
*
[0 - 500 %]
Enter the kinetic back-up gain value
in percent.
Parameter Descriptions
Programming Guide
MG06J202
Danfoss A/S © 03/2019 All rights reserved.
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Содержание VLT AutomationDrive FC 361
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