120 Vac applications to Eaton 120 V control
Option 1:
Control Box Assembly Panel connected to earth ground
to provide 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 1:1 Isolation
transformer must be used to 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 1-6.
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. Only
source of earth ground reference on secondary of Isolation
transformer is through control box connection to ground.
Option 2:
Control Box Assembly floating (typical shop or lab applica-
tion where control is mounted on ungrounded regulator
tank or sitting on workbench).
The 120 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 1-7.
In this case, the ground of the isolation transformer 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.
8
CL-6 SERIES CONTROL INSTALLATION, OPERATION, AND MAINTENANCE INSTRUCTIONS MN225016EN January 2016
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