Specifications

J3
GE Limitamp
®
Medium Voltage Motor Control
Guideform Specifications
J
Static field supplies shall be:
(tapped transformer SFC - Static Field Contactor)
(adjustable SCR type VFC - Variable Field Contactor)
(adjustable SCR type VFC with power-factor regulation)
(adjustable SCR type VFC with field current regulation)
Additional functions
Control power at 120 volts shall be provided from a control-
power transformer in each controller. Transformer shall be
protected by current-limiting fuses.
Controller(s) shall provide instantaneous undervoltage pro-
tection when momentary-contact push button is used,
undervoltage release when maintained-contact switch is used.
(Push button) is to be (mounted on door).
(Switch) (remotely located).
Finish
Finish shall be:
(ANSI-61 light gray ov
er rust-resistant phosphate undercoat
for indoor use.)
(ANSI-61 light gray over one or more rust-resistant phosphate
undercoats for outdoor use.)
Starters - CR194 Vacuum
All Starters
Enclosure NEMA Type 1 general purpose, ventilated
Connections
Incoming Line Entrance top or bottom. Cables sepa-
rated by barrier from both low- and
high-voltage compartments.
Motor Cable Entrance top or bottom. Cables separated
by barrier from both low- and high-
voltage compartments.
Squirrel-Cage-Motor Starters
Full-Voltage Non-Reversing (FVNR)
High-voltage compartment
1- Set of bolt-in current-limiting fuses and supports
1- Externally operated disconnect switch
1- Three-pole vacuum contactor
1- Set of mechanical interlocks to prevent opening the disconnect
when the contactor is on, to prevent opening the door when
the disconnect is on, to prevent closing the contactor when
the disconnect is in an intermediate position, and to prevent
closing of the disconnect when the high-voltage door is open
1- Fused primary control power transformer (CPT)
3- Current transformers
3- Terminals for motor cable connections
Low-voltage compartment
1- Three-pole, ambient-compensated thermal overload
relay, hand-reset
1- NORMAL-TEST selector switch
1- Control-circuit fuse
On door
1- START-STOP push button, oil-tight, flush-mounted
Full-Voltage Reversing (FVR)
Same as for full-voltage non-reversing with addition of following:
Auxiliary enclosure
2- Three-pole vacuum contactors for reversing
On door
1- FORWARD-REVERSE-STOP push button, oil-tight, flush-
mounted (replacing START-STOP push button)
Reduced-Voltage Non-Reversing (RVNR) (Primary Reactor)
Same as for full-voltage non-reversing with addition of following:
1- Three-pole vacuum contactor used as a RUN contactor
Auxiliary enclosure (1-high)
1- Reduced-voltage starting reactor with taps for 50-, 65-
and 80-percent line voltage
Low voltage compartment
1- Definite time transfer relay
Reduced-Voltage Non-Reversing (RVNR)
(Autotransformer closed transition)
Same as for full-voltage non-reversing with addition of following:
1- Three-pole vacuum contactor used as a RUN contactor
Auxiliary enclosure (1-high)
2- Three-pole vacuum contactor - neutral, and 80-percent
line voltage
Low-voltage compartment
1- Definite time transfer relay
Wound-Rotor-Motor Starters
Non-Reversing
Same as for squirrel-cage FVNR with addition of following:
Secondary enclosure
1- Set of intermediate accelerating contactors
1- Final accelerating contactor
1- Set of definite time accelerating relays
Resistor enclosur
e
1- Set of starting-duty resistors, NEMA Class 135
Reversing
Same as for non-reversing with addition of following:
High-voltage compartment
1- Three-pole vacuum contactor used for reversing
On door
1- FORWARD-REVERSE-STOP push button, oil-tight, flush-
mounted (replacing START-STOP push button)