GE Industrial Solutions AF-600 FP High Power (460V_575V 150HP and above) - Manual (Page 43)

3.3.5 Cooling Fans
All frequency converters in this size range are equipped with cooling fans to provide airflow along the heatsink. Units in NEMA 1 (IP21) and NEMA 12 (IP54) enclosures
have a fan mounted in the enclosure door to provide additional airflow to the unit. Chassis (IP00) enclosures have a fan or fans mounted to the top of the unit for
additional cooling. Some frequency converters in this size range have a small 24 VDC fan mounted on the input plate. This fan is only mounted on 5x-frame size
units equipped with both an RFI filter and mains fuses. The fan provides air flow around the main fuses. The fan operates anytime the frequency converter is
powered.
All fans are powered by mains voltage which is stepped down by an autotransformer and regulated to 200 or 230 VAC by circuitry provided on the power card.
On/off and high/low speed control of the fans is provided to reduce overall acoustical noise and extend the life of the fans.
Fans are activated by the following causes:
60% of nominal current exceeded
Specific heatsink temperature exceeded (power size dependent)
DC hold active
DC brake active
Pre-magnetization of the motor
Automatic motor adaptation in progress
Regardless of the heatsink temperature, the fans are started shortly after main input power is applied to the frequency converter.
Once fans are started, they will run for a minimum of 10 minutes.
3.3.6 Fan Speed Control
The cooling fans are controlled with sensor feedback which regulates fan operation and speed control as described below.
1. IGBT thermal sensor measured temperature. The fan can be off, low speed, or high speed based on this temperature.
IGBT Thermal Sensor 4x Frame Units 5x Frame Units
Fan Turn On Low Speed 45 ° C 45 ° C
Fan Low Speed to High Speed 50 ° C 50 ° C
Fan High Speed to Low Speed 40 ° C 40 ° C
Fan Turn Off from Low Speed 30°C 30°C
Table 3.1: IGBT Thermal Sensor
2. Power card ambient temperature sensor measured temperature. The fan can be off or high speed based on this temperature.
Power Card Ambient 4x Frame Units 5x Frame Units
Fan turn on to High Speed 35 ° C 45 ° C
Fan turn off from High Speed 30 ° C 40 ° C
Fan turn on to High Speed <10 ° C <10 ° C
Table 3.2: Power Card Ambient Temperature Sensor
3. Control card thermal sensor measured temperature. The fan can be off or low speed based on this temperature.
Control Card Ambient 4x Frame Units 5x Frame Units
Fan turn on to Low Speed 55 ° C 55 ° C
Fan turn off from Low Speed 45 ° C 45 ° C
Table 3.3: Control Card Thermal Sensor
4. Output current value. If the output current is greater than 60% of rated current, the fan will turn on low speed.
AF-650 GP and AF-600 FP High Power Service Manual
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