Gmr-32b Phase Controller Manual <Tested • 2026>

GMR-32B Phase Controller (or Phase Sequence Relay) is an industrial protective device designed to monitor three-phase power supplies and safeguard equipment like motors and air compressors from electrical faults. Key Features & Functions Comprehensive Fault Detection : Monitors and protects against: Phase Loss : Detects if any of the three phases (R, S, T) are missing. Phase Reversal/Sequence

The GMR-32B features an onboard 8-position DIP switch to set input signals and firing modes without requiring an external software interface. Input Signal Selection Selected Input Mode 4–20 mA Current Loop 0–10 V DC Voltage 0–5 V DC Voltage Ωcap omega Manual Potentiometer Firing Control Modes gmr-32b phase controller manual

| Symptom | Probable Cause | Corrective Action | | :--- | :--- | :--- | | | No power supply / Internal Fuse blown. | Check L1/L2/L3 input connections; check internal fuse. | | Red LED Lit (Phase Loss) | Broken wire or blown upstream fuse. | Use multimeter to verify voltage on all three input terminals. | | Red LED Lit (Phase Seq) | L1, L2, L3 connected in wrong order. | Swap any two incoming power lines (e.g., swap L1 and L2) at the input terminal. | | Intermittent Tripping | Loose connection or Hysteresis set too low. | Tighten terminal screws; Increase Ud (Unbalance) threshold slightly. | | Relay Not Switching | External load exceeds relay rating. | Verify load current is < 3A; check for short circuit in external control wiring. | GMR-32B Phase Controller (or Phase Sequence Relay) is

Clean the heatsink and check the cooling fan. Input Signal Selection Selected Input Mode 4–20 mA

Avoid direct sunlight, moisture, and corrosive gases. Mounting Steps Hold the unit vertically to allow natural convection. Maintain at least 50mm of clearance above and below.

Set Switch 3 to ON, Switches 1 and 2 to OFF. Step 3: Initial Calibration and Power-Up

| Specification | GMR-32B / Smart Series Value | | :--- | :--- | | | 200-500VAC (Standard), up to 690VAC (Smart Series) | | Frequency | 50 / 60 Hz | | Rated Control Circuit Voltage | Three-phase 220V, 380V, 400V, 415V, 440V, 460V | | Relay Contact Capacity | 5A at 250VAC (resistive load) | | Voltage Measurement Accuracy | ±1% of reading | | Over/Under Voltage Set Point | Adjustable approx. ±15% of nominal voltage | | Over/Under Voltage Hysteresis | 7V (prevents relay chatter) | | Voltage Imbalance Trip Level | >10% or >20% (model dependent) | | Response Time (Trip Delay) | Phase Loss: 1s / Phase Sequence: 0.1s / Over/Under Voltage: 7s / Imbalance: 5s | | Reset Mode | Automatic (restores function when fault clears) |