Voltage Monitoring Relay (Model: G2PM400VSY20)
🔹 1. Introduction / परिचय
The G2PM400VSY20 is a 3-phase multifunction voltage monitoring relay made by TELE (GAMMA Series).
यह एक ऐसा रिले है जो तीनों फेज़ (L1, L2, L3) की वोल्टेज स्थिति को मॉनिटर करता है, और अगर वोल्टेज में कोई असामान्यता (abnormal condition) होती है तो आउटपुट सिग्नल देकर लोड को प्रोटेक्शन देता है।
It helps protect motors, compressors, and control panels from overvoltage, undervoltage, phase failure, phase reversal, and voltage imbalance.
🔹 2. Function / कार्य
| Function | Description (English + Hindi) |
|---|---|
| Phase Monitoring | Checks all three phases (L1, L2, L3) for presence — अगर कोई एक फेज़ गायब हो जाए तो रिले ट्रिप करता है। |
| Phase Sequence Check | Detects correct phase rotation (R-Y-B). If phase sequence उलटा (reversed) है, तो रिले आउटपुट बंद कर देता है। |
| Overvoltage Protection | जब वोल्टेज limit से ऊपर जाता है, तब लोड को isolate कर देता है। |
| Undervoltage Protection | जब supply voltage limit से नीचे जाता है, तब भी relay ट्रिप करता है। |
| Phase Imbalance | जब तीनों फेज़ में voltage difference एक limit से ज़्यादा हो जाता है। |
| Window Function | Maintains voltage within a set “window” (under + over voltage range दोनों)। |
🔹 3. Use / उपयोग
The G2PM400VSY20 relay is used for continuous voltage supervision in:
- Industrial panels (MCC, PCC panels)
- Motor starters and pump control panels
- Refrigeration & HVAC systems
- Generator & DG set panels
- Automation panels and compressor control units
💡 Simple use:
यह relay मोटर को खराब वोल्टेज या गलत फेज़ से बचाता है ताकि winding जलने या equipment failure से नुकसान न हो।
🔹 4. Application / अनुप्रयोग
| Area | Application Example |
|---|---|
| Injection Moulding Machines | Phase failure protection for hydraulic motor and heaters. |
| Compressor Units | Protects motor from low/high voltage and wrong phase rotation. |
| Water Pumps / Submersible Systems | Prevents dry running or reverse rotation due to phase reversal. |
| Conveyor Motors | Protects against phase imbalance and sudden voltage drop. |
| Chillers / HVAC Units | Ensures safe startup and shutdown during power fluctuations. |
🔹 5. Normal Settings / सामान्य सेटिंग
Below are basic setting guidelines 👇
| Setting | Description |
|---|---|
| Function Selector Switch | Choose UNDER, UNDER+SEQ, WIN, or WIN+SEQ as per need. (Example: For full protection, select WIN+SEQ). |
| Under Voltage (Min.) | Set around -10% of rated voltage (e.g., for 400V → 360V). |
| Over Voltage (Max.) | Set around +10% of rated voltage (e.g., for 400V → 440V). |
| Asymmetry (Imbalance) | Generally 10–15% recommended. |
| Time Delay (Trip delay) | Set between 1 to 5 seconds to avoid false tripping during short fluctuations. |
| Start-up Delay | 2–3 seconds so that relay doesn’t trip during motor start surge. |
💡 Note: Always follow equipment datasheet or OEM recommendation.
🔹 6. Advantages / लाभ
✅ Provides full protection against voltage faults (phase loss, reverse, over/under).
✅ Reduces motor burnout and equipment failure.
✅ Increases system reliability and safety.
✅ Compact DIN-rail design, easy to install.
✅ Adjustable delay and voltage range settings.
✅ Gives both visual indication (LED) and output contact.
🔹 7. Disadvantages / नुकसान
❌ Cannot protect against current overload — need overload relay separately.
❌ If settings are too tight, false tripping may occur.
❌ Needs proper neutral reference in some applications.
❌ Cost slightly higher than single-function relays.
🔹 8. Technical Specification (Important Points)
| Parameter | Description |
|---|---|
| Model | G2PM400VSY20 |
| Supply Voltage | 24–240 VAC/DC |
| Measuring Voltage | 3×400/230V (3-phase system) |
| Output | 2 changeover contacts (DPDT), 5A @ 250V AC |
| Mounting Type | DIN rail, 22.5mm width |
| Protection | Phase loss, reverse, over/under voltage, asymmetry |
| Manufacturer | TELE Haase (Austria) |
🔹 9. Safety Precautions / सुरक्षा सावधानी
- Always disconnect power before wiring.
- Use proper rated fuse in series with the relay.
- Avoid loose terminal connections.
- Use control contact for starter coil, not for heavy load directly.
- Check phase rotation after maintenance.
🔹 10. Conclusion / निष्कर्ष
The G2PM400VSY20 Voltage Monitoring Relay is an essential device for industrial motor and system protection.
यह relay वोल्टेज मॉनिटरिंग और प्रोटेक्शन दोनों का काम करता है, जिससे आपके electrical equipment को सुरक्षित और reliable operation मिलता है।
By correct installation and proper setting, you can avoid motor damage, production downtime, and maintenance cost.
