1. Key models

CG240D, CG240D1 and CG240K etc.

2. Product overview

The CG240 series is an intelligent digital cooling fan control system specifically designed for switchgear cabinets requiring forced air cooling. The digital control technology replaces the conventional indirect temperature-based control method, effectively resolving issues such as large deviations in activation thresholds caused by indirect temperature measurement, excessive frequent cycling of fans, delayed response. The product adopts real-time sampling of the primary side current on the high-voltage side, and starts and stops the fan according to the current size. It has the advantages of on-site setting of the starting current and continuous monitoring of the fan working status, thereby ensuring the reliable and normal operation of the switchgear.

3. Functions & features

• Real-time current sampling replaces traditional temperature-based control for fan operation

Signal input: single or triple current signal sampling

• Real-time ambient temperature & humidity monitoring for auxiliary fan control

Use high-precision digital temperature and humidity sensors to ensure sampling accuracy

• Multi-channel fan status synchronized monitoring

Real-time operating current detection for up to 6 fan circuits with status tracking.

• Remote control for effortless operation

External remote manual start, stop or remote reset can be performed directly

• Stable and reliable, multiple protections

Wide voltage input: supports AC/DC 110-240V (50-60Hz), adaptable to complex power supply environments.

Fault self-diagnosis: real-time monitoring of fan stall, overcurrent, overtemperature, and other abnormal states with alarm alerts and protective actions.

Strong EMI immunity (Class III) & insulation performance: insulation strength complies with IEC 60255-5 (2KVrms-1min).

Real-time fan status monitoring: fault indication via audible/visual alarms + relay output.

• Smart IoT Connectivity

Remote Monitoring & Control: RS485/MODBUS communication can be added to enable cloud-based data management and remote operation.

Multi-fan networking: single controller supports monitoring and control of 1~6 fans

• Easy installation:

Modular Design: compact dimensions with DIN-rail mounting, full compatibility with standard cabinets.

4. Technical specifications

1. Signal input: configurable combination of 3-phase current + dual-channel temperature/humidity measurement

CT secondary input current: 1A/5A, Class 0.5

Temperature: -30～99℃ (accuracy of ±1℃), humidity 5～99%RH (accuracy of ±5%RH)

2. Dimensions and cutout dimensions: Available in either DIN rail or flush-mount configurations depending on model.

3. Fan, heating and alarm relay capacity: 5A/250VAC (max 5A)

Fan activation conditions: when primary current is fan activation current threshold or ambient temperature is > fan startup temperature upper limit

Fan deactivation conditions:   when primary current is < (fan activation threshold current − return difference), and ambient temperature is < fan startup upper temperature limit − 10°C, and shutdown delay timer expired

Heater activation conditions: when the ambient temperature < set temperature or ambient humidity > set humidity

Heater deactivation conditions: when the ambient temperature > (set temperature + 5°C) and the ambient humidity < (set humidity - 10%)

Alarm triggering conditions: fan failure or not connected properly

Alarm exit conditions: fan is operating normally

4. Working temperature and humidity range: temperature -10 ~ +55 ℃; humidity <95%RH (25 ℃)

5. Applications

Power equipment: substation cabinets, photovoltaic inverters for heat dissipation.  

Industrial control: variable frequency drive (VFD) cabinets, servo drive cooling systems  

Data centers: smart air cooling for server racks.  

Renewable energy sources: charging piles, energy storage battery temperature control systems.