Schneider RM17TA00 3-Phase Multifunction Supply Monitoring Relay

(위상 순서 / 위상 손실 / 3-Phase Voltage Unbalance)

시리즈: Zelio Control / Harmony RM17T Series, DIN 레일 장착 3-phase monitoring relay, commonly known as phase sequence protector.

✅ Monitoring Functions

Phase sequence detection (L1-L2-L3): Instant trip upon reverse phase sequence

Phase loss detection: Instant trip if any phase is lost (including phase loss with regenerated voltage from motors)

3-phase voltage asymmetry (불균형): Adjustable threshold from 5% 에게 15% of Un, with time-delayed tripping

Logic rule: 위상 반전 / phase loss → instantaneous trip; voltage unbalance → delayed trip.

📌 Key Electrical Specifications

Monitoring voltage range: AC 208～480V (operating limit: 183～528V AC)

빈도: 50/60 헤르츠 (±10%)

Output contact: 1 C/O (SPDT), 5에이 / 250VAC

Time delay adjustment: 0.1～10s (only for unbalance faults)

Reset delay: 대략. 1.5에스

소비전력: ≤22VA @ 400V 50Hz

설치: DIN 35mm rail; width 17.5mm (1 모듈 폭)

표시: Status LED; sealed transparent cover prevents accidental parameter changes

🧮 RM17T Series Selection Comparison (Key for Model Selection)

RM17TT00: 위상 순서 + 위상 손실 (NO unbalance monitoring)

RM17TA00 (현재 모델): 위상 순서 + 위상 손실 + 3-phase voltage asymmetry

RM17TU00: 위상 순서 + 위상 손실 + 저전압

RM17TE00: 위상 순서 + 위상 손실 + asymmetry + 과전압 + 저전압 (full-function model)

🛠️ 일반적인 적용 시나리오

엘리베이터, hoisting & 운반 장비, 공기 압축기, 물 펌프, 냉동 장치, 포장 기계; prevents motor reverse rotation, burnout from phase loss, and overheating caused by three-phase unbalance.

🔌 Wiring Guidelines

1. Connect L1/L2/L3 directly to the monitored three-phase supply (self-powered, no separate auxiliary supply required).
2. 터미널 15/16/18 form one changeover contact: 15-16 = normally closed; 15-18 = normally open.
3. Panel setting: First select rated voltage (208/220/380/400/415/480다섯), then set unbalance threshold and fault delay time.
4. Fault recovery: Automatic reset once power returns to normal; no manual reset button.

⚠️ 문제 해결

Relay does not energize after power-up: Check phase sequence, 위상 손실, and voltage range dip switch setting.

Frequent tripping during normal operation: Increase unbalance percentage threshold, extend time delay, and investigate single-phase load current imbalance.

No LED illumination: Three-phase input voltage exceeds the 183~528V operating range.

📎 Replacement Options

Direct upgraded replacement within the same product line: RM22TA33 (RM22 series, same functions with 2 C/O contacts).

국내 대안: 친트 / Delixi three-phase phase-sequence & unbalance monitoring relays.

1. Full Model List of RM17T Series

(3-phase supply monitoring relays, 17.5mm single-module width, DIN 레일 장착)

1) 기본 모델: RM17TG (Only phase sequence + 위상 손실; no unbalance / undervoltage monitoring)

RM17TG00: 1 C/O changeover contact, 208～480V AC

RM17TG20: 2 C/O dual changeover contacts, 208～440V AC

2) Multifunction Models (RM17TT / 깃 달기 / TU / 그만큼, 208～480V AC, 1 C/O contact uniformly)

Abbreviation explanation:

TU = T + 저전압

TE = T + Everything (전체 기능)

III. Common Specifications for the Whole Series (All Models Identical)

전압 범위: AC 208～480V (operating limit 183～528V)

접점등급: 5에이 / 250VAC; RM17TG00/TT/TA/TU/TE = 1 C/O; only RM17TG20 = 2 C/O

너비: 17.5mm (1P module)

재설정 모드: Automatic reset after fault clears; no manual reset button

1. Upgraded Replacement Models (RM22 Series with Extra Contacts)

RM17TA00 → RM22TA33 (2 C/O contacts)

RM17TU00 → RM22TU23

RM17TE00 → RM22TE33

RM17TA00 Overall Dimensions (폭 × 높이 × 깊이)

17.5 mm × 90 mm × 72 mm

너비: 17.5 mm (1-pole module, same width as 1P MCB)

키: 90 mm

깊이 (from DIN rail front face): 72 mm

설치: DIN35 standard rail

순중량: 대략. 0.13 kg

✅ All models in RM17T series (RM17TT00 / RM17TU00 / RM17TE00 / RM17TG00) share identical dimensions.

Core Positioning of RM17TA00

It provides phase sequence + 위상 손실 + three-phase voltage unbalance protection, mainly for three-phase asynchronous motors. It prevents reverse rotation, motor burnout from phase loss, and overheating caused by long-term voltage imbalance. 자가 동력, compact 1-module DIN rail design, ideal for compact control cabinets and retrofitting projects where no PLC signal collection is needed.

1. 산업 & Equipment Applications
2. 게양 & 운반 (기본 애플리케이션)

오버헤드 크레인, electric hoists, 벨트 컨베이어, stackers, 엘리베이터; prevents motor reverse rotation after phase reconnection and overheating damage to gearboxes and motors due to long-term unbalance.

2. 엘리베이터 & Lifting Platforms

Freight elevators, simple lifting platforms, parking lift power circuits; wrong phase sequence causes reverse car movement; voltage unbalance leads to excessive temperature rise of traction motors.

3. 워터 펌프 & 펌핑 스테이션

High-power centrifugal pumps, submersible sewage pumps, pre-power monitoring before variable-frequency drives; unbalance is frequently caused by mixed single-phase loads in water supply, sewage treatment and chiller pump systems.

4. 공기 압축기 & HVAC Refrigeration Units

Screw air compressors, 물 냉각기, air-source heat pumps, 냉동 압축기; compressors are highly sensitive to three-phase unbalance, which easily burns out motor windings.

5. 포장, 직물 & Woodworking Automation

포장라인, 섬유 기계, 압출기, injection molding auxiliary equipment; frequent power maintenance and phase swapping require phase sequence verification before power-on.

6. Fan Loads

Exhaust fans, induced draft fans, drying fans; large inertia fans produce regenerated voltage after phase loss; this model supports phase loss detection under regenerated voltage conditions.

7. Control Panels & OEM Equipment Matching

380V three-phase control cabinets, non-standard automation OEM factory-fitted protection; old equipment retrofits, hard-contact interlock without adding PLC analog modules.

1. Selection Boundary: 적합한 / 부적합한 시나리오

✅ Recommended:

Three-phase motor loads with risks of voltage asymmetry overheating (core advantage over RM17TT00)

Supply voltage AC 208~480V, 50/60헤르츠

제한된 캐비닛 공간, 오직 1 module width available

Hard-contact interlock directly wired into main contactor coil circuit

❌ Not recommended:

과전압 + undervoltage monitoring required → choose RM17TE00

Only undervoltage protection without unbalance → choose RM17TU00

Dual independent alarm contacts required → upgrade to RM22TA33 (2C/O)

Motors behind variable-frequency drives: VFDs already have built-in phase loss & 불균형 보호; extra relay is generally unnecessary.

III. Typical Control Logic

Contact wired in series with the main contactor coil circuit:

Normal power supply → relay energizes and closes, contactor power permitted;

위상 반전 / 위상 손실 / voltage unbalance detected → relay de-energizes and opens, cutting off main power, with dry contacts available for PLC or audible-visual alarm signals.