Specifications

B5
GE Limitamp
®
Medium Voltage Motor Control
Controllers
B
interrupter tips that the DC hipot cannot distinguish from real
problems such as a loss of vacuum. AC hipot systems, on the
other hand are able to “burn-off” these anomalies, allowing
the good interrupter to recover (Normal contactor load currents
will also burn-off these anomalies).
If it is desired to use a DC hipot on a vacuum contactor, it is
important to recognize that the results may falsely indicate
a bad bottle. Also, DC voltage levels should not be greater
than 1.4 times the recommended AC RMS value in order to
maintain a safe margin of voltage to X-ray emission. At 35kV
small amounts of X-ray radiation may be emitted. The level
of emission is well below the allowable levels established in
ANSI 37.85-1972. Using DC hipot at 28 kV (1.4 x 20 kV AC
RMS) does maintain a safe margin to X-ray emission.
Construction
There are three basic constructions available utilizing the
vacuum contactor:
• CR194 two-high 400 Amp
• CR194 one-high 400 Amp
• CR194 one-high 800 Amp
CR194 Two-High 400 Amp
The two-high construction has basic dimensions of 36” wide,
90” high and 30” deep. An optional 40-inch-wide enclosure is
also available when additional cabling space is required.
Bolted rigid frame construction provides an accurate and
simple building platform, giving greater structural strength
and flexibility. Full top and bottom compartment isolation is
provided for greater safety, and the two-high construction is
UL/cUL approved.
A door-in-door construction provides roomy low-voltage
compartments, which offer flexibility, safety and high density.
A large low-voltage door mounting surface permits multiple
relays and metering packages, including drawout relays. The
interior of the low-voltage compartment features a white
mounting panel, which is easily accessible and provides ample
space for numerous control options.
Figure B.4 CR194 two-high construction
The enclosure will accommodate outgoing cable sizes as
shown in Table B.6 when both top and bottom compartments
house contactors. There is an option to use the top compart-
ment as an incoming line section with limited cable sizes.
Refer to the factory for details. Otherwise, an auxiliary section
will be required.
It is not necessary to de-energize one controller to service or
install the second controller. The enclosure is designed to
safely permit termination of one set of motor leads while the
other controller is energized.
Main horizontal power bus is available in 1200, 2000 and 3000
amperes. Both the main and vertical bus may be insulated
and accessible from front and rear. The horizontal power
bus will match with existing Limitamp lineups, including
air-break units.
The current ratings are shown in Table B.5.
Table B.5 Ratings and Horsepower Limitations in CR194
Two-high Vacuum Control
Contactor
Location
Maximum
Current
Horsepower
2400 Volts 4200 Volts 7200 Volts
Vented
Non-
Vented
Vented
Non-
Vented
Vented
Non-
Vented
Vented
Non-
Vented
Top 360 320 1600 1200 2800 2500 4500 4000
Bottom 400 320 1800 1200 3100 2500 4500 4000