Ambient Conditions; Cooling Systems - KEB Combivert F5 series Instruction Manual

General

1.4.4 Ambient Conditions

The operating temperature range of the unit is -10°C to + 45°C. Operation outside
of this temperature range can lead to shut down of the inverter.
The unit can be stored (power off) in the temperature range -25°C to 70°C. After
prolonged storage, one half year or more, apply voltage to the inverter for 2 hours before
operating the motor. This will allow the electrolytic bus capacitors to stabilize before use
and result in longer lifetime of the unit.
The power rating of the inverter must be derated for operation above 3,300 ft (1000 m).
Reduce the rated power 1% for each additional 330 ft (100 m). The maximum elevation
for operation is 6,560 ft (2000 m)
The relative humidity should be limited to 95% without condensation.

1.3.5 Cooling systems

The KEB COMBIVERT F5 is available with different cooling systems:
Standard - Standard design with heat sink and thermostatically controlled two speed
fan.
Flat Back - With this design the heat sink is omitted. The unit must be mounted onto an
appropriate base (a machined surface) to ensure heat removal from the inverter. The
dissipation of the heat must be guaranteed by the machine builder. Advantages include:
low profile for intermittent duty controls, heatsink sharing, modular assembly.
Water-cooling - This design is laid out for connection to an existing cooling system. The
dissipation of the heat must be guaranteed by the machine builder. To avoid moisture
condensation, the minimum inlet temperature of the coolant may not fall below the room
temperature. The maximum inlet temperature shall not exceed 40°C. Measures must be
taken to prevent contamination and calcifying buildup within the cooling system. The
maximum pressure on the cooling system shall not exceed 4 bar (60 psi (special versions
with higher pressures on request). The standard water pipe fitting is G1/2.
Convection (push through version) - The heat sink is over sized and designed to push
through the cabinet wall to the outside. The smaller units (<40hp ) generally will operate
without additional air flow through the heatsink. The larger units will require some type
of forced airflow through the heatsink.
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