Drive control and features
85
Fan control logic
The fan operation can be controlled via parameter 46.13 FAN CTRL MODE. The
parameter provides the following four operation modes: Normal, Force OFF, Force
ON and Advanced. The control logic (Normal or Advanced) can be overridden by
forcing the fan ON or OFF in which case the fan is running always or never.
In the Normal mode the fan operation is based on the ON/OFF status of the
modulator. In addition, the fan runs a predetermined period after the modulator has
been switched OFF, which prevents the fan from starting and stopping unnecessarily
when the modulator is inactive only for a short period.
In the Advanced fan control mode, the fan operation is based on the measured
temperature of power stage, braking chopper (BC), interface board (INT board) and
DC link voltage. The fan is started if the temperature of the power stage or INT board
or BC rises over the predetermined level. Also an exceptionally high long-term DC
link voltage generates the running command for the fan. The fan is stopped if the
power stage, braking chopper and INT board are cool and the DC link voltage is
below the limit.
With the Normal or Advanced mode the DC voltage activation level for the fan ON
command is 640 VDC.
The fan runs a short period after a power-up regardless of parameter 46.13 FAN
CTRL MODE to remove moisture and dust from the machinery.
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