Danfoss VLT 5000 FLUX, Руководство по эксплуатации, Страница: 104 / 158

VLT
®
5000 FLUX
Function:
This parameter allows monitoring of the power
transmitted to the brake resistor. The power is
calculated on the basis of the resistor ohm value
(parameter 401), the intermediate circuit voltage and
the resistor running time. If the power transmitted
over 120 sec. exceeds 100% of the monitoring limit
(parameter 402) and Warning [1] has been selected,
a warning will come up on the display. The warning
will disappear if the power goes below 80%. If the
calculated power exceeds 100% of the monitoring
limit and Trip [2] has been selected in parameter 403
Power monitoring, the frequency converter will trip
and give an alarm. If power monitoring has been
selected Off [0] or Warning [1], the brake function will
remain active, even if the monitoring limit has been
exceeded.This may lead to thermal overload of the
resis tor. It is also possible to have a warning via the
relay/digital outputs. The typical measuring accuracy
of the power monitoring depends on the accuracy of
the resistor ohmic value (better than ± 20%).
Description of choice:
Select whether this function is to be active (
Warning/Alarm ) or inactive ( Off ).
404 Brake check
(BRAKE TEST)
Value:
✭
Off (OFF) [0]
Warning (WARNING) [1]
Trip (TRIP) [2]
Function:
In this parameter a testing and monitoring function
can be integrated which will give a warning or an
alarm. On power-up it will be tested whether the brake
resistor is disconnected. The test of whether the brake
resistor is disconnected is carried out during braking,
while the test of whether the IGBT is disconnected
is carried out when there is no braking. A warning
or trip disconnects the brake function.
The testing sequence is as follows:
1. If the intermediate circuit voltage is higher than the
brake starting voltage, discontinue the brake check.
2. If the intermediate circuit voltage is unstable,
discontinue the brake check.
3. Carry out a brake test.
4. If the intermediate circuit voltage after the
brake test is lower than the starting voltage,
discontinue the brake check.
5. If the intermediate circuit voltage is unstable,
discontinue the brake check.
6. If the braking power is higher than 100%,
discontinue the brake check.
7. If the intermediate circuit voltage is higher than
the intermediate circuit voltage -2% before the
brake test, discontinue the brake check and
give off a warning or alarm.
8. Brake check OK.
Description of choice:
If Off [0] is selected, this function will still monitor whether
the brake resistor and the brake IGBT short-circuit
during operation, in which case it will give off a warning.
If Warning [1] is selected, the brake resistor and brake
IGBT will be monitored with respect to short-circuiting.
In addition, on power-up it will be checked whether
the brake resistor has been disconnected.
NB!:
A warning in connection with Off [0] or Warning
[1] can only be removed by disconnecting the
mains supply and turning it back on, provided
the fault has been corrected. Please note that in
connection with Off [0] or Warning [1] the frequency
converter will continue even if a fault has been found.
In the case of Trip [2], the frequency converter will
cut out while giving an alarm (trip locked) if the brake
resistor has short-circuited or been disconnected
or if the brake IGBT has short-circuited.
405 Reset function (RESET MODE)
(RESET MODE)
Value:
✭
Manual reset (MANUAL RESET) [0]
Automatic reset x 1 (AUTOMATIC X 1)
[1]
Automatic reset x 2 (AUTOMATIC X 2) [2]
Automatic reset x 3 (AUTOMATIC X 3) [3]
Automatic reset x 4 (AUTOMATIC X 4) [4]
Automatic reset x 5 (AUTOMATIC X 5) [5]
Automatic reset x 6 (AUTOMATIC X 6)
[6]
Automatic reset x 7 (AUTOMATIC X 7) [7]
Automatic reset x 8 (AUTOMATIC X 8) [8]
Automatic reset x 9 (AUTOMATIC X 9) [9]
Automatic reset x 10 (AUTOMATIC X 10) [10]
Reset at power up (RESET POWER UP)
[11]
Function:
This parameter makes it possible to select the
reset function desired after tripping.
After reset, the frequency converter can be restarted.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.55.A6.02 - VLT is a registered Danfoss trademark
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