FlexTrol
™
Class E2 Medium Voltage Controllers with
Eaton Contactor
Powered by Safety
®
40
01.4IB.46300
Operation
Insulation can be tested from phase to
phase and from phase to ground. The
recommended level for AC Hi-Pot testing is
(2 x V
LL
) volts, where V
LL
is the rated
line-to-line voltage of the power system.
The leakage current must be less than
20mA. Record the result for future
comparison testing.
If a Megger is used, it should indicate
50,000 megohms or greater if the unit is
isolated from the line and the motor. If the
unit is connected to a motor, the Megger
should indicate 5,000 megohms or greater
(phase to ground).
e. p
re
-o
peration
t
est
!
WARNING
This test procedure requires that the motor
connection cables be disconnected from the
motor terminals and be properly insulated
or isolated to withstand primary voltage at
the motor terminals. This test shall only be
performed by qualified personnel trained and
certified in high voltage testing procedures.
Adherence to all site-specific high voltage
safety procedures shall be strictly enforced.
Failure to follow this safety precaution may
result in injury or death.
After finishing the megger test, follow these
procedures to complete a pre-operation test:
1. Close all compartment doors and apply
power to the medium voltage motor
control center.
2. Close the isolating switch by placing the
operating handle in the extreme upper
position until it latches into the ON position
. If the operating handle is not
properly closed and latched, the contact
marked control power interlock will not
close.
Note:
If the isolating switch operating
handle cannot be placed into the ON
position, deenergize and ground the
equipment. Check the mechanical
interlocking isolation switch. In
order to place the operating handle
in the ON position, the high voltage
compartment door must be fully
closed and the vacuum contactor
must be in the OPEN position.
3. Operate FlexTrol
™
in the normal manner
using the pilot devices (usually push
buttons) provided.
4. After the operation tests are made, connect
the motor and check it for proper rotation.
F. s
tart
-u
p
p
roceDure
1) Preliminary Checks
Verify the following:
• Contactor current and voltage ratings
are correct for the attached load
• Control voltage is correct
• Heater elements (if provided) in
overload relay are secure and
undamaged
• Equipment is properly grounded
• External power and control connections
match electrical drawings
• All hardware is correctly reinstalled and
torqued to specifications
• All barriers are replaced to correct
positions
• All fuses are correct class, type, and
rating
• Mechanical interlocks and isolation
switches function properly
• Ensure that relays are programmed
• Ensure that interior of compartment
is free from dirt, loose bolts, tools, or
metal chips. Vacuum if necessary.
