Inverter Protection
6-49
îš‹ Cooling Fan Control
This function controls the fan that is mounted to the inverters heatsink.
îš„Related Parameters
Multi-function Relay Outputs (H2-01 to H2-02)
îš„Selecting the Cooling Fan Control
Using parameter L8-10 two modes can be selected:
0:The fan is ON only when the inverter output is ON, i.e. a voltage is output. This is the factory setting.
1:The fan is ON whenever the inverter power supply is switched ON.
If L8-10 is set to 0, the turn OFF delay time for the fan can be set in parameter L8-11. After switching OFF the
RUN command the inverter waits for this time before the cooling fan is switched. The factory setting is 300
sec.
Parameter L8-32 selects whether failure of the internal cooling fan will lead to an OH1 fault or not. The fac-
tory setting is 0. This disables the OH1 fault in case of fan failure and displays a FAN alarm instead. Setting 1
activates the OH1 fault also in case of a internal fan failure.
îš„Application Precautions
When L8-32 is set to 0 and the internal fan fails the Inverter’s overload capability is automatically derated by
10%. The overload time at 100% of the Inverter rated current becomes 30 seconds and the overload time at
120% becomes 10 seconds.
îš‹ Setting the Ambient Temperature
The overload capability of the inverter depends on the ambient temperature. At ambient temperatures higher
than 45°C (40°C for Inverters in protection class IP20 / NEMA1) the output current capacity is reduced, i.e.
the OL2 alarm level will be lowered. Refer to Fig 6.40 for the output current derating.
Parameter
Number
Name
Setting
Range
Factory
Setting
Change
during
Operation
Access
Level
L8-10 Cooling fan control selection 0 or 1 0 No A
L8-11 Cooling fan control delay time 0 to 300 300 sec. No A
L8-32 OH1 detection selection for fan failure 0 or 1 1 No A
Set Value Function
3D Cooling fan fault (ON: internal cooling fan fault)
IMPORTANT
If using L8-32 = 0 a multi-function output should be set to 10 (Alarm) or 3D (Cooling Fan Error) to indi-
cate to peripheral equipment that the Inverter’s internal cooling fan has failed. Under this condition the
Inverter should be immediately stopped and serviced for fan replacement. If the Inverter continues to run
in this state, its internal temperature will increase, resulting in a potential decrease of lifetime.
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