2-13 Brake Power Monitoring
Option:
Function:
[6]
Warning &
trip 30s
Warning and trip based on 30 s time
periode.
[7]
Warning 60s
Warning based on 60 s time periode.
[8]
Trip 60s
Trip based on 60 s time periode.
[9]
Warning &
trip 60s
Warning and trip based on 60 s time
periode.
[10] Warning 300s Warning based on 300 s time periode.
[11] Trip 300s
Trip based on 300 s time periode.
[12] Warning &
trip 300s
Warning and trip based on 300 s time
periode.
[13] Warning 600s Warning based on 600s time periode.
[14] Trip 600s
Trip based on 600 s time periode.
[15] Warning &
trip 600s
Warning and trip based on 600 s time
periode.
If power monitoring is disabled or Warning is selected, the
brake function remains active, even if the monitoring limit
is exceeded. This may lead to thermal overload of the
resistor. It is also possible to generate a warning via a
relay/digital outputs. The measuring accuracy of the power
monitoring depends on the accuracy of the resistance of
the resistor (better than
±
20%).
2-15 Brake Check
Option:
Function:
Select type of test and monitoring function to
check the connection to the brake resistor, or
whether a brake resistor is present, and then
display a warning or an alarm in the event of a
fault. The brake resistor disconnection function is
tested during power-up. However, the brake
IGBT test is performed when there is no braking.
A warning or trip disconnects the brake function.
The testing sequence is as follows:
1.
The DC-link ripple amplitude is
measured for 300 ms without braking.
2.
The DC-link ripple amplitude is
measured for 300 ms with the brake
turned on.
3.
If the DC-link ripple amplitude while
braking is lower than the DC-link ripple
amplitude before b1%. Brake
check failed, return a warning or alarm.
4.
If the DC-link ripple amplitude while
braking is higher than the DC-link
ripple amplitude before b1%.
Brake check OK.
[0]
*
Off
Monitors brake resistor and brake IGBT for a
short-circuit during operation. If a short-circuit
occurs, a warning appears.
[1]
Warning
Monitors brake resistor and brake IGBT for a
short-circuit, and runs a test for brake resistor
disconnection during power-up.
2-15 Brake Check
Option:
Function:
[2]
Trip
Monitors for a short-circuit or disconnection of
the brake resistor, or a short-circuit of the brake
IGBT. If a fault occurs, the frequency converter
cuts out while displaying an alarm (trip locked).
[3]
Stop and
trip
Monitors for a short-circuit or disconnection of
the brake resistor, or a short-circuit of the brake
IGBT. If a fault occurs, the frequency converter
ramps down to coast and then trips. A trip lock
alarm is displayed.
[4]
AC brake Monitors for a short-circuit or disconnection of
the brake resistor, or a short-circuit of the brake
IGBT. If a fault occurs, the frequency converter
performs a controlled ramp-down.
NOTICE
Remove a warning arising in connection with
[0] Off
or
[1] Warning
by cycling the mains supply. The fault must
be corrected first. For
[0] Off
or
[1] Warning
, the
frequency converter keeps running even if a fault is
located.
2-16 AC brake Max. Current
Range:
Function:
100 %
*
[ 0 - 1000.0
%]
Enter the maximum permissible current
when using AC brake to avoid
overheating of motor windings. The AC
brake function is available in Flux mode
only.
NOTICE
Parameter 2-16 AC brake Max. Current
has no effect when
1-10 Motor Construction
=
[1] PM, non-salient SPM
.
2-17 Over-voltage Control
Option:
Function:
[0]
Disabled
No OVC required.
[2]
*
Enabled
Activates OVC.
NOTICE
Parameter 2-17 Over-voltage Control
has no effect when
1-10 Motor Construction[1] PM, non-salient SPM
.
NOTICE
The ramp time is automatically adjusted to avoid
tripping of the frequency converter.
Programming
Design Guide
20
Danfoss A/S © Rev. 05/2014 All rights reserved.
MG90O202
5
5
Содержание VLT Brake Resistor MCE 101
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