240 Vac applications to Eaton 120 V control
Option 1:
Control Box Assembly/Panel connected to earth ground
to provided protection to operations personnel (typical
field application where control is mounted on grounded
Regulator tank or dropped down pole with control box
grounded properly).
Since the control is configured for 120 Vac, a 2:1 Isolation
transformer must be used to step and isolate the supply
voltage. 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 1-4.
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. Only source
of earth ground reference on secondary of Isolation trans-
former is through Control Box connection to ground.
Option 2:
Control Box assembly floating (typical shop or lab applica-
tion when control is mounted on ungrounded regulator tank
or setting on workbench).
Since the control is configured for 120 Vac, a 2:1 Isolation
transformer must be used to step and isolate the supply
voltage. 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 1-5.
In this case the ground of the isolation transformers is
connected to the green terminal post on the CL-6 series
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.
6
CL-6 SERIES CONTROL INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225016EN January 2016
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