Setting The Ambient Temperature - Omron VARISPEED F7 User Manual

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 a stop command
the inverter waits for this time before switching OFF the cooling fan. The factory setting is 60 sec.

Setting the Ambient Temperature

At high ambient temperatures the output current has to be derated. The derating depends on the ambient tem-
perature and the protective structure of the inverter. The ambient temperature derating curve is shown in
6.65. To ensure a safe inverter protection at high ambient temperatures, always set parameter L8-12 to the
actual ambient temperature. The inverter overload capability will be 120% / 150% (depending on C6-01) of
the derated current for 1 minute.
6
Related Parameters
Parameter
No.
L8-12
IMPORTANT
66
6-
100
80
60
40
20
0
0 10 20
Fig 6.65 Ambient Temperature Derating Curve
Name
Ambient temperature
Since the inverter has no IP00/ NEMA 1 (IP20) detection, with NEMA 1 (IP20) units the ambient tem-
perature value in L8-12 has to be set 5° higher than the actual ambient temperature.
30 40 50
Temperature (°C)
Change
Factory during
Setting Opera-
tion
45 °C
IP00
IP20
60
Control Methods
Open Closed
V/f with
V/f Loop
PG
Vector
No A A A
Fig
Loop
Vector
A