Eaton KA146W5 User Manual

240 Vac applications to and Eaton's Cooper Power series 240 V control
Option 1:
The control box assembly/panel is connected to earth
ground to provide protection to operations personnel. This is
a typical field application where the control is mounted on
a grounded regulator tank or dropped down a pole with the
control box grounded properly.
The 240 Vac control cabinet from Eaton's Cooper Power
series utilizes a 240 Vac to 120 Vac (2:1) auto transformer
inside the control cabinet on the back panel. This
transformer steps down the 240 Vac external supply to
provide 120 Vac to the control panel. Inside the CL-7 control,
the neutral and ground are connected in several locations.
Care should be taken when applying external power.
The 240 Vac external source must be completely isolated.
In most cases an isolation transformer is needed. This
isolation transformer must isolate both the neutral and line
on the secondary side. Also, the neutral and ground on
the secondary side should not be bonded or connected.
To check isolation from earth ground, check the continuity
of each lead on the isolation transformer with respect to
ground (G). Check this before connecting the leads to the
control panel. See Figure6.
The control panel assembly is grounded through the tank
or a separate grounding strap. Earth ground of the isolation
transformer is not connected to the control. The only source
of earth ground reference on the secondary side of the
isolation transformer is through the control box connection
to ground.
Option 2:
The control box assembly is floating. This is a typical shop
or lab application where the control is mounted on an
ungrounded regulator tank or sitting on a workbench.
Eaton's Cooper Power series offers an optional control
configuration that accepts 240 Vac external power. In this
configuration, a 240 Vac to 120 Vac (2:1) auto transformer
is installed inside the control cabinet on the back panel.
This transformer steps down the 240 Vac external supply to
provide 120 Vac to the control panel. Inside the CL-7 control,
the neutral and ground are connected in several locations.
The 240 Vac external source must be completely isolated.
In most cases an isolation transformer is needed. This
isolation transformer must isolate both the neutral and line
on the secondary side. Also, the neutral and ground on
the secondary side should not be bonded or connected.
To check isolation from earth ground, check the continuity
of each lead on the isolation transformer with respect to
ground (G). Check this before connecting the leads to the
control panel. See Figure7.
In this case, the ground of the isolation transformer is
connected to the green terminal post on the CL-7 control.
In this configuration, the only source of earth ground
reference on the secondary side of the isolation transformer
is through the control box connection to the isolation
transformer ground.
8
INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225003EN April 2018
CL-7 Voltage Regulator Control

Eaton KA146W5 Specifications

General

Brand	Eaton
Model	KA146W5
Category	Cables and connectors
Language	English