VLT® 5000 Crane
Programming
4. If the intermediate circuit voltage 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 MODE
Value:
✭
Manual reset (MANUAL RESET)
[0]
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.
Description of choice:
If
Manual reset
[0] is selected, reset must be
effected via the [RESET] key.
Warning: The motor may start
without warning.
421 SPEED FILT. TIME
Value:
1 - 20 ms
✭
3.2 ms
Function:
Oscillations on the feedback signal are dampened
by a lowpass filter and the resolution on speed
measurement is increased. This is necessary for the
Flux Vector control to function properly. The
Speed
Filter Time
is used with
Speed Control, Closed Loop
.
Description of choice:
If a time constant (
τ
) eg. of 10 ms is programmed, the
cut-off frequency for the lowpass filter will be 1/0.01 =
100 RAD/sec., corresponding to (100/2 x
π
) = 16.0
Hz. This means that the PI regulator will only regulate
a feedback signal that varies by a frequency of less
than 16.0 Hz. If the feedback signal varies by a higher
frequency than 16.0 Hz, the PI regulator will not react.
For parameter group 5xx, please refer to the following
chapter,
Serial Communication
.
✭
= factory setting. () = display text [] = value for use in communication via serial communication port
MG.50.N4.02 - VLT is a registered Danfoss trademark
69
