Electrical Connections - Graf oneAdvanced Operation Manual

10 Electrical connections

An onsite all-pole circuit breaker for the mains voltage must be used for the electrical connec-
tions. The controller for wastewater treatment plants may be operated in a switch cabinet only,
which must comply with IP44 or NEMA 3 or higher. All electrical connections to the rear side of
this controller must lie inside the switch cabinet.
Figure 15: Electrical connections for KLcontrol.M
10. Electrical connections
WARNING
Hazardous voltage
Danger from electric shock. An electric shock can cause
serious burns and life threatening injury.
Only specialised electricians may be assigned to work on the
electrical installations and to connect the plant to its power
supply.
Before all work on the electrical system, disconnect the
controller from its power source and secure it against
reactivation.
On removal of the power supply, there may still be voltage
across charged capacitors.
Wait until the capacitors have discharged!
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