Danfoss VLT AutomationDrive EZ FC 321 Programming Manual page 101

VLT® AutomationDrive EZ FC 321
Programming Guide
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 braking +1%: 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 braking +1%: Brake check is
OK.
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 Monitors for a short circuit or disconnection of the brake resistor, or a short circuit of the brake IGBT. If a
trip 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%
Conversion index: -1
Enter the maximum allowed current when using AC braking to avoid overheating of motor windings.
Parameter 2-16 AC brake Max. Current has no effect when parameter 1-10 Motor Construction=[1] PM, non salient SPM.
Danfoss A/S © 2021.08
N O T I C E
N O T I C E
Parameter type: Range, 0 - 1000.0%
Data type: Uint32
N O T I C E
Parameter Descriptions
Setup: All setups
Change during operation: True
AU373327181955en-000101 / 130R1208 | 101