Heat inside a control panel does not come from one single component. Typical heat sources include:
- PLC and I/O module
- Power supply
- Relay and contactor
- Terminal block and wiring
- Servo drive or stepper drive
- Transformer
- HMI or display
Total heat generation is the sum of all components. The panel surface area, ambient temperature, and sealing condition also affect internal temperature.
Component life is affected by operating temperature. Before selecting a cooling method, confirm:
- Maximum allowed ambient temperature of each component
- Current measured panel internal temperature
- Panel surface temperature
- Ambient temperature around the panel
- Panel sealing condition
If the measured internal temperature is close to the component limit, a cooling unit is required. If the internal temperature is only slightly above ambient, forced ventilation may be sufficient.
|
Condition |
Recommended Method |
|
Panel internal temperature slightly above ambient, clean air |
Filter fan |
|
Panel internal temperature 10°C–15°C above ambient |
Fan with filter, larger air flow |
|
Panel internal temperature 15°C or more above ambient |
Compressor cooling unit |
|
Dust, oil mist, or high humidity environment |
Closed-loop compressor cooling unit |
|
Panel sealing required |
Closed-loop compressor cooling unit |
For panels in dusty or oily environments, a closed-loop unit avoids dust entering the cabinet through ventilation openings.
In dust, oil mist, or high humidity environments, the following points should be confirmed:
- Protection level of the unit
- Air inlet filter maintenance interval
- Condensate drainage path
- Panel sealing gasket condition
- Corrosion resistance of the mounting bracket
If the environment has conductive dust or metal particles, confirm the panel sealing level before installation.
Condensate may form on the evaporator surface when panel internal temperature is low and ambient humidity is high. Confirm:
- The drainage pipe is not blocked
- The drainage outlet is away from electrical components
- The drainage pipe has a downward slope
- The drainage outlet is not in a location with water accumulation
If humidity is very high, discuss a condensate management solution at order confirmation.
Power supply: 220V/1/50Hz.
Before connecting power, confirm:
- Voltage and frequency match the nameplate
- The power cable cross-section meets the unit current requirement
- The earthing wire is connected
- The power supply is stable and free of frequent voltage fluctuation
For panels powered by a common distribution unit, confirm the additional load does not exceed the distribution capacity.
Recommended maintenance:
|
Interval |
Item |
|
Monthly |
Clean air inlet filter, check drainage pipe |
|
Quarterly |
Check unit running current, check sealing gasket |
|
Every 6 months |
Check temperature sensor, check fan blade |
|
Every 12 months |
Check refrigerant charge, check electrical connections |
Keep spare parts: air filter, sealing gasket, drainage pipe, fan.
|
Symptom |
Check |
|
Panel internal temperature too high |
Filter blockage, ambient temperature, panel heat generation |
|
Water inside panel |
Drainage pipe blocked, sealing gasket damaged |
|
Unit does not start |
Power supply, voltage, temperature controller setting |
|
Noise increases |
Fan blade, mounting screws, panel vibration |
Standard Configuration (SAS Series, Selected Models)
|
Parameter |
Unit |
SAS300 |
SAS450 |
SAS800 |
SAS1200 |
|
Cooling capacity |
W |
300 |
450 |
800 |
1200 |
|
Power supply |
V/ph/Hz |
220/1/50 |
220/1/50 |
220/1/50 |
220/1/50 |
|
Refrigerant |
- |
R22/R134A |
Same |
Same |
Same |
|
Protection level (internal/external) |
IP |
IP54/IP54 |
IP54/IP54 |
IP54/IP54 |
IP55/IP54 |
|
Noise |
dB(A) |
55 |
55 |
60 |
65 |
|
Dimensions (W×H×D) |
mm |
287×446×185 |
287×500×185 |
350×630×205 |
361×745×215 |
Q: How do I know whether I need a compressor cooling unit or just a fan?
A: Measure the panel internal temperature and ambient temperature under normal working conditions. If the internal temperature is only slightly above ambient and the air is clean, a filter fan may be sufficient. If the internal temperature is 15°C or more above ambient, or if the environment has dust, oil mist, or high humidity, a compressor cooling unit is required.
Q: What causes water inside the control panel?
A: Water inside the panel usually comes from condensate that is not drained properly, or from a damaged sealing gasket. Check whether the drainage pipe is blocked or has an upward slope. Check whether the sealing gasket is deformed or aged. If humidity is very high, discuss a condensate management solution at order confirmation.
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