Check heatsink temperature, supply voltage on all phases (three-phase model), and external fuses.
To reduce high inrush currents—especially when firing into highly inductive loads like transformers or variable motors—the GMR32B includes a trimpot. Turn the trimpot clockwise to increase the ramp-up time (up to 10 seconds), forcing the controller to gradually introduce power when turned on. 5. Maintenance and Troubleshooting
[ Main 3-Phase Power: L1, L2, L3 ] │ │ │ ▼ ▼ ▼ ┌───────────────────────┐ │ Terminal 1, 2, 3 │ <-- GMR-32B Input │ │ │ [Internal SPDT] │ │ Terminal 4 & 5 │ <-- GMR-32B Relay Output └───────────┬───────────┘ │ ▼ ┌───────────────────────────┐ │ Contactor Coil / VFD Input│ <-- Breaks control circuit on fault └───────────────────────────┘ 4. Commissioning & Visual LED Diagnostic Indicators
Check if the three-phase input power is present at the L1, L2, L3 terminals. LED is showing a fault (Red/Flashing):
Two Normally Open (NO) and two Normally Closed (NC) isolated contacts. gmr32b phase controller manual
| Parameter | Specification / Range | | :--- | :--- | | | 220VAC, 380VAC, 440VAC, 460VAC, 500VAC, 690VAC. Factory set to user order. | | Rated Frequency | 50Hz / 60Hz. | | Operating Voltage Range | Typically 0.8 to 1.15 × Vn. | | Contact Form | 2C/O (2 Form C) – 2 Normally Open (NO) + 2 Normally Closed (NC) contacts. | | Contact Capacity | 6A at 250VAC (resistive), 3A at 30VDC. | | Power Consumption | ≤10VA. | | Installation | DIN rail mounting (HT35) or direct surface mounting with screws. | | Wire Size | 1.0 – 2.5 mm² (solid or stranded with ferrule). | | Operating Temperature | -10°C to +55°C. | | Storage Temperature | -25°C to +70°C. | | Dimensions (L × W × H) | Standard models: ~68mm × 30mm × 76mm. Other variants: ~79mm × 23mm × 79mm. | | Weight | ~150g. | | Standards | Compliant with GB14048.5-2001 / IEC60947-1 (general low-voltage switchgear). | | Terminal Type | Screw terminals for reliable, permanent connections. |
Switch the controller configuration from zero-cross to phase-angle mode. 6. Technical Support and Disposal
Please refer to the table below for the detailed specifications of the GMR-32B controller. Note that specifications can vary between manufacturers (e.g., Langfei, Kesi Electronics) and specific sub-models (e.g., GMR-32B+N for 4-wire systems).
A: 500 mA RMS. Below that, the SCR may not latch properly. Use a dummy load or a different controller. Check heatsink temperature, supply voltage on all phases
The GMR-32B is built for ease of use, often designed for DIN rail mounting within an electrical cabinet. Manuals generally describe a simple wiring process that involves connecting the three power phases and setting the desired relay or transistor output modes to interface with broader control systems.
One line has dropped zero voltage.
It is important to note at the outset that "GMR32B" is not a standard, widely recognized industry part number for a major commercial phase controller (such as those from Emerson, Eurotherm, or Watlow). It is most likely a , a rebranded OEM part, or potentially a typographical error for a similar-sounding model (such as the GEM series or a specific Eurotherm model).
Always completely turn off the external power supply before installing or wiring the device to prevent electric shock or equipment damage. Terminal Layout: | Parameter | Specification / Range | |
| Switch | Function | OFF (default) | ON | |--------|----------|---------------|-----| | 1 | Input type | 4–20 mA | 0–10 V | | 2 | Source | External | Internal (+10V) | | 3 | Firing mode | Phase-angle | Zero-cross burst | | 4 | Feedback | Voltage (open loop) | Current (closed loop, requires external CT) | | 5 | Soft start | Disabled (0 sec) | Enabled (2 sec ramp) | | 6 | Alarm action | Latched (manual reset) | Auto-reset (when temp <70°C) |
The is correctly configured when the power system is balanced between
The GMR-32B functions primarily as a plug-and-play protector that operates optimally across standard global power grids. Below are its core mechanical and physical operating limits: frequency. Trip Time Thresholds: Phase loss responds in , while phase sequence errors isolate circuits in Voltage Deviations: Tolerates of the configured input voltage.
The GMR-32B is designed to detect and respond to several common electrical faults:
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