Schneider RM17TG00 Последовательность фаз & Реле контроля потери фазы

RM17: Harmony RM17 series three-phase monitoring relay

TG: Monitors phase sequence and phase loss only (no voltage unbalance, overvoltage or undervoltage functions)

00: 1 переключающий контакт (1C/O) версия; RM17TG20 in the same series is the 2C/O dual-contact model

✅ Основные функции

Monitors three phases L1/L2/L3:

1. Phase sequence error (reverse phase, защита от обратного вращения двигателя)
2. Phase loss fault (loss of two or more phases; single-phase weak voltage drop will NOT trigger)

Автономный, energized directly from L1/L2/L3, no additional auxiliary источник питания необходимый

📋 Основные технические характеристики

🔌 Terminal Wiring Definition

Верхние клеммы: Л1, Л2, L3 → Connect to three-phase power supply

Lower contact terminals:

11: Общий

14: Нормально открытый (НЕТ) (closed in normal state, открыт по вине)

12: Нормально закрытый (Северная Каролина) (открыт в нормальном состоянии, closed under fault)

With correct three-phase supply and proper phase sequence: реле подает питание, LED ON; Потеря фазы / reversed phase → relay de-energizes, Светодиод ВЫКЛ.

🛠️ Типичные сценарии применения

Hoisting equipment, лифты, конвейерные линии, water pump sets, preventing motor reverse rotation

Воздушные компрессоры, chiller unit three-phase power protection

Portable equipment power access detection, emergency power switching judgment

⚠️ Troubleshooting Points

1. Светодиод выключен: No power on three-phase incoming lines or loose wiring;
2. LED fails to energize after power-up: Most likely reversed phase sequence, swap any two L phases;
3. Single-phase voltage drop will not trigger RM17TG00. TG series only detects complete phase loss and does not monitor voltage unbalance. For unbalance/overvoltage & защита от пониженного напряжения, select RM17TE series.

🧩 Same-series Comparison & Справочник по замене

RM17TG00: 1C/O, последовательность фаз + потеря фазы

RM17TG20: 2C/O dual changeover contacts, последовательность фаз + потеря фазы

17TE00 ринггитов: With voltage unbalance, перенапряжение, пониженное напряжение, phase loss and phase sequence (full-featured model)

📌 Notes

No potentiometer for threshold adjustment, fixed logic without adjustment knobs;

For three-phase 3-wire system only;

Dry contact output for PLC DI or contactor coil interlock circuit.

Шнайдер RM17TG20 Troubleshooting Document

Применимый: RM17TG00 / RM17TG20 three-phase phase sequence & реле потери фазы

Safety Precaution: High-voltage work must follow power cut & voltage verification. Use qualified high-voltage multimeter and wear insulated protective gear for three-phase voltage measurement.

Product Principle Review: Only monitors phase sequence and complete loss of two or more phases; single-phase voltage drop and voltage unbalance will not trigger protection. Self-powered from L1/L2/L3. Нормальное состояние: желтый светодиод горит, both contact sets energized; Fault state: yellow LED OFF, both contact sets de-energized

1. Pre-check Preparation
2. Инструменты: Цифровой мультиметр, cross screwdriver, изоляционные перчатки
3. Подтверждение модели: RM17TG20, rated monitoring voltage 208~440VAC (limit 183~484VAC), long-term operation above 440VAC is not permitted
4. System Confirmation: Three-phase 3-wire system, no neutral wire connected; this model cannot detect single-phase drop in 3P4W system
5. Basic Status Description: ≤650ms initialization delay after power on; fault response ≤130ms; relay stays de-energized when fault exists, auto-recovers once fault cleared
6. Troubleshooting by Fault Symptom

Симптом 1: Yellow LED completely off after power-up, relay contacts no action

Описание: No indicator light after energizing, контакты 11/14 и 21/24 fail to close

1. Выключить питание, inspect L1/L2/L3 terminals: Check for looseness, oxidation or poor crimping; clean dust and copper oxide on terminals
2. Включение питания, measure line-to-line voltage L1-L2, L2-L3, L1-L3 at relay upper terminals with multimeter

Any line voltage ＜183V: Undervoltage on power supply, relay cannot operate; check upstream circuit breaker, fuse and cable breakage

No voltage on two or more phases: Upstream phase loss fault, repair power supply circuit

3. LED still OFF with all three-phase voltages normal:

Check miswiring of L1/L2/L3; confirm power cables are not connected to contact terminals

Inspect module appearance: Треснувший корпус, burn marks or carbonized terminals → internal damage, replace relay directly

Cross test: Remove relay and connect to known good three-phase supply; if LED remains off, relay is defective

Симптом 2: Three-phase supply normal, LED stays off, relay continuously reports fault (contacts not energized)

Most frequent on-site fault: Обратная последовательность фаз

1. Measure three line voltages and confirm all values between 183~484VAC with balanced three-phase voltage
2. Выключить питание, swap any two incoming L phases (например. L1 and L3)
3. Re-energize and observe LED:

LED ON and contacts close: Fault resolved, root cause reversed phase sequence

LED still OFF after twice phase swap: proceed to next step

4. Check for virtual connection with induced voltage: Multimeter shows normal voltage but voltage collapses under load. TG series cannot identify weak single-phase drop, but will trigger phase loss alarm if single-phase voltage falls below 100V
5. Still invalid: Relay internal failure, replace for test

Симптом 3: LED is ON, but no signal on output contact circuit (no PLC feedback / contactor fails to act)

Power monitoring circuit healthy, fault lies in secondary dry contact circuit

RM17TG20 has two independent changeover contact sets: 11/12/14 и 21/22/24, both act synchronously

1. Power off and verify contact wiring:

11, 21: Общие терминалы

14, 24: Нормально открытый (НЕТ) (закрыт при подаче питания; открыт по вине)

12, 22: Нормально закрытый (Северная Каролина) (open when energized; closed under fault)

2. Включение питания (relay normal state, LED ON), measure continuity with multimeter:

11 & 14, 21 & 24: should conduct; 11 & 12, 21 & 22: should be open

3. Manually create fault (обратная последовательность фаз), Светодиод ВЫКЛ.:

11 & 14, 21 & 24: открыть; 11 & 12, 21 & 22: руководить

4. Asynchronous action between two contact sets (one closed, one open): Internal contact damage, must replace relay
5. Contact status correct but no signal on downstream circuit: Check PLC DI module, external interlock circuit, broken secondary wiring or blown fuse

Симптом 4: Random false tripping during motor operation (Светодиод ВЫКЛ., protection trip)

1. Monitor three-phase voltage, focus on voltage dip during motor starting:

⚠️ Important Limitation: RM17TG only detects complete loss of two phases; single-phase voltage dip will not trigger protection. Random tripping is mostly caused by instantaneous two-phase power loss or poor connection

2. Inspect main circuit contactor, thermal relay terminals and cable lugs for loose connections, overheating and poor contact under high current
3. Check power cables: Повреждение кабеля, earth fault or risk of phase-to-phase short circuit
4. EMI Troubleshooting: Relay routed in parallel with power cables; relocate RM17TG away from VFDs and contactors, use separate cable trunking or shielding
5. Confirm supply voltage does not exceed RM17TG20 upper limit 440VAC; use RM17TG00 for 480VAC application
6. Cross replacement test: If fault disappears after installing new relay, original relay is aged and damaged

Симптом 5: Relay does not alarm with single-phase cut-off (protection no action)

This is NOT a fault, it is inherent design limitation!

RM17TG series only detects loss of ≥2 phases. Single-phase disconnection and single-phase voltage drop cannot trigger protection

If single-phase loss, voltage unbalance, перенапряжение & undervoltage protection required: Replace with RM17TE00 multi-function monitoring relay

III. Quick Self-check Procedure (On-site Maintenance Checklist)

✅ Step1: Выключить питание, inspect appearance and wiring (терминалы, следы ожогов, рыхлость)

✅ Step2: Power on and measure L1-L2 / L2-L3 / L1-L3 line-to-line voltages

✅ Step3: Observe LED status to locate fault domain (источник питания / последовательность фаз / relay itself)

✅ Step4: Power off and swap two L phases to verify reversed phase sequence

✅ Step5: Power off and test continuity of two contact sets to confirm switching logic

✅ Step6: Cross replace relay to confirm whether fault comes from relay or external wiring

1. Распространенные заблуждения
2. ❌ Заблуждение: Relay should protect on single-phase loss

✅ Note: TG series only detects loss of two or more phases; single-phase breakage is not detected.

2. ❌ Заблуждение: Front panel adjustment knobs are available for threshold setting

✅ Note: RM17TG has no potentiometer, threshold fixed.

3. ❌ Заблуждение: Two contact sets can act independently

✅ Note: Two contact sets operate synchronously; asynchronous action indicates relay damage.

4. ❌ Заблуждение: Can be used in 3P4W system (с нейтральным проводом)

✅ Note: For three-phase 3-wire only, neutral wire must NOT be connected.

1. Replacement Criteria (Replace relay if any condition met)
2. L1/L2/L3 supply voltage normal, LED remains OFF after phase sequence swap
3. Two contact sets act asynchronously, contacts burnt or fail to switch
4. Housing or terminals show black burn marks, bulging or carbonization
5. Fault eliminated after installing new relay under same power condition
6. Рекомендации по техническому обслуживанию
7. Периодическая проверка: Tighten L1/L2/L3 input terminals and contact terminals quarterly to prevent vibration-induced looseness
8. Условия окружающей среды: Operating temperature -20~+60℃; avoid heavy dust, humid or corrosive gas environment
9. Очистка: Clean module surface dust with dry brush after power cut, liquid cleaner prohibited
10. Срок службы: Mechanical life of contacts >10 миллион циклов; electrical life approx.100,000 cycles at 5A@250VAC

Schneider RM17 Series Three-phase Monitoring Relay Full List (Harmony Zelio, 35мм DIN-рейка, 17.5mm 1-module width)

All models are self-powered from L1/L2/L3, no auxiliary supply required, 5A@250VAC dry contact output, for three-phase 3-wire system

1. RM17TG (Базовая модель: последовательность фаз + phase loss only, no adjustment knobs, fixed threshold)

TG Series Features: Нет потенциометра, no adjustment window on housing, only yellow status LED; Single-phase voltage drop will not trigger alarm

1. RM17TT / ОБЛИЦОВКА / TU / ТО (Multi-function adjustable type, transparent cover with adjustment knobs)

III. RM17 Series Single-phase / DC Voltage Monitoring (Та же серия, non three-phase)

1. Model Suffix Coding Definition (RM17Txx00)

TG: Базовый тип, fixed threshold, no adjustment knob, последовательность фаз + потеря фазы

ТТ: Adjustable basic model, последовательность фаз + потеря фазы, voltage range selectable

ОБЛИЦОВКА: Т + Asymmetry voltage unbalance detection

TU: Т + Undervoltage monitoring

ТО: Total full functions (последовательность фаз, потеря фазы, разбалансировать, перенапряжение, пониженное напряжение)

00: 1C/O output

20: 2C/O dual independent changeover contacts (only available for TG series)

1. Таблица быстрого выбора (Three-phase models)

1. Common General Specifications
2. Монтаж: 35мм DIN-рейка, 1 модуль (17.5мм);
3. Output Logic: Relay energized (power normal) → contacts closed; fault → contacts open (fail-safe type);
4. Источник питания: Self-powered directly from L1/L2/L3, нет нейтрального провода, three-phase 3-wire system only;
5. Время ответа: TG fixed ≤130ms; TT/TA/TU/TE fault delay manually adjustable;
6. Рейтинг контактов: 5A 250VAC resistive load; for PLC DI and contactor interlock circuit, not for direct driving of high-power loads

VII. Замена & Upgrade Reference

RM17TG00 ↔ RM17TG20: identical function, only contact quantity differs

RM17TT00 → RM17TA00: add voltage unbalance detection

RM17TA00 → RM17TE00: add overvoltage and undervoltage window monitoring

Legacy RM22TG series is substitute series (та же функция, different form factor)