•
•
-
-
N O T I C E
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.
If the DC-link ripple amplitude while braking is lower than the DC-link ripple amplitude before b1%:
Brake check has
failed by returning a warning or alarm
.
If the DC-link ripple amplitude while braking is higher than the DC-link ripple amplitude before b1%:
Brake check is
OK
.
N O T I C E
Remove a warning arising with
[0] Off
or
[1] Warning
by cycling the mains supply. The fault must be corrected first. For
[0] Off
or
[1] Warning
, the drive keeps running even if a fault is located.
Option Name
Description
[0]*
Off
Monitors brake resistor and brake IGBT for a short circuit during operation. If a short circuit occurs,
Warn-
ing 25 Brake resistor shortcircuited
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]
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 drive cuts out while showing an alarm (trip lock).
[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 drive ramps down to coast and then trips. A trip lock alarm is shown (for example, warn-
ings 25, 27, or 28).
[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 drive performs a controlled ramp-down.
[5]
Trip lock
Parameter 2-16 AC Brake Max. Current
Table 158: Parameter 2-16 AC Brake Max. Current
2-16 AC Brake Max. Current
Default value: 100%
Parameter type: Range, 0 - 1000.0%
Setup: All setups
Conversion index: -1
Data type: Uint32
Change during operation: True
Enter the maximum allowed current when using AC braking to avoid overheating of motor windings.
N O T I C E
Parameter 2-16 AC brake Max. Current
has no effect when
parameter 1-10 Motor Construction=[1] PM, non salient SPM
.
AU373327181955en-000101 / 130R1208 | 101
Danfoss A/S © 2021.08
Parameter Descriptions
VLT® AutomationDrive EZ FC 321
Programming Guide