KKT chillers ECO 133 L, Install Instructions Manual

Page: 17 / 39

83003502.Kc ECO_Install_Instruction_V03.odt
Page 17 of 39
5.9 EMC Compatibility and Grounding
This comments are compiled to help the field electrician to install the grounding of the
power supply and to get a EMC Compatibility.
All electrical equipment produces radio and line-borne interference at various
frequencies. The cables pass this on to the environment like an aerial.
The basic countermeasures are isolation of the wiring of control and power components,
proper grounding and shielding of cables.
A large contact area is necessary for low-impedance grounding of HF interference. The
use of grounding straps instead of cables is therefore definitely advisable.
Moreover, cable shields must be
connected with purpose-made ground
clips.
The grounding surface must be highly
conductive bare metal. Remove any
coats of varnish and paint.
The width of the grounding wire must be min. 16mm² (AWG 6) or of the same width of the
power supply.
The grounding must be an isolated ground and must connected on the ground terminal
(X1) in the switch cabinet. The ground resistance must be less than 5 Ohm.
Metal cable conduits are not allowed for grounding.
The piping of the chiller (supply and return) have to be grounded too.
Do not share the ground wire with other devices.
Always use a ground wire that complies with technical standards on electrical equipment
and minimize the length of the ground wire.
When using more than one Inverter, be careful not to loop the ground wire.