Scope of this technical record
Compact-drive evidence package for deciding repair, donor board, used replacement drive or modernization path on VLT 2800 / 2900 hardware.
Evidence collection must be performed by qualified personnel with the drive isolated and discharged before internal access.
VLT 2800 / 2900 evidence package
The evidence package supports repair, donor-drive or modernization decisions.
VLT 2800 / 2900 compact-drive evidence record
Repair or replace starts with evidence
The compact drive may be repairable, but the decision depends on whether the case is control supply, motor/cable fault, output power stage or current feedback. A short code description is not enough.
The service package should include the first observed symptom, not only the last alarm after several resets.
Evidence package
| Evidence | Why it matters | Decision supported |
|---|---|---|
| Type code and power size | Matches donor or replacement hardware | Used drive / donor board |
| First display state | Separates boot trouble from output trip | Control supply or fault route |
| Alarm timing | Separates load from drive-side fault | Workflow selection |
| Motor/cable proof | Protects replacement hardware | External repair or drive repair |
| Board labels and history | Avoids wrong board assumption | Repair or replacement |
Field record checklist
- Type code
- Power size
- First symptom
- Alarm log
- Display pattern
- Motor/cable proof
- Input/DC-link evidence
- Board labels
- Repair history
Technical basis and reference documents
This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.
Confirms Alarm 13 overcurrent, Alarm 14 earth fault, Alarm 16 current short circuit, input-phase and DC-link alarm boundaries used to structure the first service routes.
Documents VLT 2800 warning and alarm text including Alarm 13 peak current, Alarm 14 ground fault, Alarm 15 switch-mode supply and Alarm 16 short-circuit cautions.
Provides practical Alarm 14 separation between motor/cabling evidence and drive-side current-sensor evidence, including no-motor current observations and manual-initialization caution.
Linked circuit records
Low-voltage route for VLT 2800 blinking-display and control-board cases: DC-link feed, auxiliary supply start-up, +5 V logic, +24 V control, 10 V reference, keypad interface and external I/O load must be separated.
Energy path for compact Danfoss cases where DC-link undervoltage, display instability or power-board suspicion must be separated from input fuses, rectifier, DC link and auxiliary supply behavior.
Output-stage route for Alarm 13, Alarm 14 and Alarm 16 cases after external motor, cable and terminal evidence has been collected. The route connects gate-drive channels, driver supply, current feedback and output module decisions.
Turn this record into a qualified service request
A repair decision is much more reliable when the request includes the exact identity of the drive, the first fault evidence and the machine condition when the symptom appeared.
- Complete drive type code / MLFB or nameplate model
- Fault code, fault value and first event before reset
- When the event appears: power-up, enable, ramp, run, decel or stop
- Motor/cable connected or isolated during the symptom
- Visible board, option-card, module and connector identifiers
- Previous repair history, replacement parts and repeat-failure pattern