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Control-board / display / low-voltage evidence record

Danfoss VLT 2800 CB1-CB3 Control-Board Evidence Record

Provides compact-drive control electronics, keypad/display interface, low-voltage logic and I/O reference paths used when diagnosing blinking display or weak control supply behavior.

Board evidence record8 min read

Scope of this technical record

Evidence record for VLT 2800 control-board, display and low-voltage cases before repair, donor-board or replacement-drive decisions.

Safety boundary

Remove power and verify safe state before board access. Board-level work is for qualified personnel only.

VLT 2800 CB1-CB3 evidence route

1Type code
→
2Display
→
3Rails
→
4I/O
→
5Board label

The record collects chassis-side evidence before keypad, board or replacement choices.

Control-board evidence to collect

A useful CB1-CB3 record includes the type code, board label, display behavior, low-voltage rail behavior, keypad test result and external wiring isolation result.

Without those facts, a blinking display can be misread as a keypad, board or complete-drive failure.

Field record checklist

  • Type code
  • CB1-CB3 label
  • Display behavior
  • +5 V / +24 V
  • Keypad result
  • I/O isolation
  • Reference load

Technical basis and reference documents

This is an independent editorial technical reference. Original manufacturer documentation remains controlling for installation, repair and commissioning decisions.

Danfoss service tips for VLT alarm boundariesDanfoss

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.

VLT 2800 Series instruction manualDanfoss

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.

Danfoss earth-fault service notesDanfoss

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

Circuit
Danfoss VLT 2800 +5 V / +24 V Control-Board and I/O Path

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.

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Evidence intake

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
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