Harmonic Drive CHA - Protection against Corrosion and Penetration of Liquids and Debris; Shutdown and Maintenance

751018854 12/2015 V01
5.7 Protection against Corrosion and Penetration of Liquids and Debris
The product is fully protected provided that the connectors are correctly attached. Corrosion from the ambient atmosphere
(condensation, liquids and gases) at the running surface of the output shaft seal is prevented.
Contact between sharp edged or abrasive objects (cutting chips, splinters, metallic or minerals dusts etc) and the output shaft
seal must be prevented. Permanent contact between the output shaft seal and a permanent liquid covering should also be
prevented.
A change in the operating temperature of a completely sealed actuator can lead to a pressure dierential between the out-
side and the inside temperature of the actuator. This can cause any liquid covering the output shaft seal to be drawn into the
housing which could cause corrosive damage.
As a countermeasure, we recommend the use of an additional shaft seal (to be provided by the user) or the maintenance of a
constant pressure inside the actuator. Please contact Harmonic Drive AG for further information.
Specification sealing air: constant pressure in the actuator as described above; the supplied air must be dry and filtered
with pressure at not more than 10
4
Pa.
5.8 Shutdown and Maintenance
In case of malfunctions or maintenance measures, or to shutdown the motors,
proceed as follows:
1. Follow the instructions in the machine documentation.
2. Bring the actuator on the machine to a controlled standstill.
3. Turn o the power and the control voltage on the controller.
4. For motors with a fan unit; turn o the motor protection switch for the fan unit.
5. Turn o the mains switch of the machine.
6. Secure the machine against accidental movement and against unauthorised operation.
7. Wait for the discharge of electrical systems then disconnect all the electrical connections.
8. Secure the motor, and possibly the fan unit, before disassembly against falling or movement then pay attention to the
mechanical connections.
CHA-xxA
Corrosion protection IEC 68 2-11
Salt spray test Test time 4 h
Table 75.1
ADVICE