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6 Maintenance
6.1 Precautions
Before starting work, make sure that the safety instructions have been read and understood.
DANGER: Electrical Hazard
Before starting work on the unit, make sure that the unit and the control panel are isolated
from the power supply and cannot be energized. This applies to the control circuit as well.
DANGER: Electrical Hazard
All electrical equipment must be grounded (earthed). Test the ground (earth) lead to verify
that it is connected correctly and that the path to ground is continuous.
WARNING: Electrical Hazard
Risk of electrical shock or burn. A certified electrician must supervise all electrical work.
Comply with all local codes and regulations.
WARNING: Electrical Hazard
There is a risk of electrical shock or explosion if the electrical connections are not correctly
carried out, or if there is fault or damage on the product. Visually inspect equipment for
damaged cables, cracked casings or other signs of damage. Make sure that electrical
connections have been correctly made.
CAUTION: Electrical Hazard
Prevent cables from becoming sharply bent or damaged.
Thermal hazard
CAUTION: Thermal Hazard
The surfaces or parts of the unit may become hot during operation. Allow surfaces to cool
before starting work, or wear heat-protective clothing.
6.2 Requirements
6.2.1 Electrical installation
These requirements apply:
• The cables must follow the local rules and regulations.
• The power supply to the controller must be designed such that it is possible to isolate the
controller completely from the power.
• All fuses and circuit breakers must have the correct rating, and follow the local rules and
regulations. For more information, see
DCM 711 Installation, Operation, and Maintenance Manual
Variants
on page 44.
6 Maintenance
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