ABB-RTAC-01 Resolver‑to‑Digital Interface Card

Description

Core performance characteristics

RTAC‑01 processes sine‑cosine resolver signals fed back from motor shaft resolver sensor. It converts analog resolver signals into digital position and speed information which can be recognized by drive main control unit. Installed via internal slot of frequency converter / drive unit, no standalone cabinet space required. Matches multi‑pole resolver sensors widely used on large‑size servo and main‑drive motors. Signal isolation design reduces interference from motor‑side high‑frequency noise. Supports different resolver excitation frequency settings according to actual sensor parameters. Status LED lamps display working state and signal abnormality. Power is supplied by drive backplane bus, no separate external power wiring. Operating temperature range 0 ℃ ~ +55 ℃, IP20 protection level, suitable for cabinet‑inside environment only.

Field usage conditions

Mostly paired with heavy‑duty industrial drives in metallurgy, paper machinery, lifting equipment and large‑volume production lines. It collects real‑time rotor angle and rotating‑speed data of main motor, provides feedback basis for closed‑loop speed and torque control. Applicable to newly assembled drive units; also a common replacement spare part for old‑site drive renovation. When original resolver interface fails on‑site, directly replacing RTAC‑01 can restore motor closed‑loop control without modifying motor resolver wiring. For high‑precision speed‑regulation occasions, stable resolver signal conversion guarantees motor running smoothness and avoids speed jitter caused by feedback signal distortion.

Practical deployment considerations

Module insertion and removal must be done with drive main power fully cut off. Avoid live hot‑plugging, which may damage both interface card and main control board. Resolver wiring shall adopt shielded twisted‑pair cable, separate from high‑power power‑cable laying path to restrain electromagnetic interference. Configure resolver excitation parameters inside drive software according to nameplate parameters of actual resolver sensor. Check whether slot spring contacts are oxidized or deformed before installation. Keep ventilation passages of drive cabinet unblocked; excessive ambient temperature will increase signal‑conversion error. Do not take apart the card on‑site. Once hardware damage occurs, adopt whole‑card replacement solution. Keep related parameter backup files for quick commissioning after replacement.

Typical on‑site symptoms & handling ideas

1. Drive reports resolver feedback fault: Check resolver field cable shielding and wiring integrity. Confirm drive internal resolver excitation parameter matches sensor specifications. Re‑seat RTAC‑01 card, observe whether fault disappears.
2. Motor speed jitter during operation: Check cable interference source. Verify grounding condition of resolver shielding layer. Confirm no aging inside resolver sensor; swap spare RTAC‑01 for comparison test.
3. Module indicator keeps fault alarm: Confirm resolver coil has no short‑circuit or open‑circuit fault. If external circuit is normal, it indicates internal hardware damage of RTAC‑01, implement spare‑part replacement.
4. Position feedback deviation exists: Double‑check pole‑pair parameter setting of resolver inside drive parameters.