10.98 Maintenance
Siemens AG 6SE7087-6KP50
SIMOVERT MASTERDRIVES Operating Instructions 9-3
9.1.3 Replacing the fan in units up to 180 mm wide
Two fans are mounted on the lower side of the converter, an internal
fan for cooling the control electronics and a unit fan for cooling the
power section.
Both fans are fed by the 24 V voltage supply; the unit fan is switched on
and off by electronic control according to the heat sink temperature.
The fans are designed for a service life of L
10
≥
35 000 hours at an
ambient temperature of T
u
= 45 °C. They must be replaced in good
time to ensure the availability of the unit.
♦
Before removing the old fan and fitting a new one, make sure that
the inverter is disconnected from the power supply.
♦
Opening the unit:
•
Loosen the 2 mounting screws in the front at the top of the unit.
There is no need to take the screws right out. Slots are provided
in the housing to allow the front of the unit to be released when
the screws have been loosened.
•
Carefully swing the front of the unit forwards (to an angle of
about 30°) away from the housing.
•
On the power section, open the locking lever on the ribbon cable
connector to the control electronics.
•
Move the cover forwards and take it off.
♦
Remove the fan connection X20 on the power section.
♦
Undo the four fan mounting screws and take out the fan.
♦
Fit the new fan by reversing this sequence of operations. Make sure
that the arrow indicating the direction of rotation is pointing to the
inside of the unit.
♦
The converter must be disconnected from the power supply and
removed before the fan can be replaced.
♦
Undo the four fan mounting screws and take out the fan.
♦
Disconnect the leads on the fan.
♦
Fit the new fan in the reverse order.
♦
Make sure that the arrow indicating the direction of air flow points to
the inside of the unit.
Make sure that the leads to the fan are connected the right way round.
Otherwise the fan will not operate!
Internal fan
Unit fan
NOTE
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