9.4.3.8 Checking the cooling circuit
● Check the entire cooling circuit for leaks. If you find a leak in a pipe coupling, tighten the nut
by a ¼ turn
● Compare the measured conductivity value with the permissible conductivity value for the
system (≤ 0.6 µS/cm). You must replace the ion exchanger if this value is close to 1 µS / cm.
● Check the water level in the compensating chamber of the deionized water circuit. If the
level is too low, add some more water. If the level is too high, drain some water until the level
is correct.
9.5 Maintenance
9.5.1 Replacing a fan
CAUTION
Injury caused by rotating fan
If the drive is equipped with a temperature-controlled fan, the fan can run on even if the power
section is switched off. You can be injured if you touch the fan.
● Wait until the fan has shut down and has come to a stop.
Service life of the fans
The fans must also be fitted with a monitor to ensure that the drive operates reliably. The
service life of the device fans is 30,000 hours. Replace the fan timely in order to maintain the
reliable functioning of the cabinet unit.
Note
If a DC bus is available, the fan must be removed from the back.
Maintenance
9.5 Maintenance
SINAMICS SH150 6SL3805
94 Operating Instructions 05/2020
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