Specifications

J2
GE Limitamp
®
Medium Voltage Motor Control
Guideform Specifications
J
Static field supplies shall be:
(tapped transformer static field contactor [SFC])
(adjustable silicon controlled rectified variable field contactor
[SCR type VFC])
(adjustable VFC with power factor regulation)
(adjustable VFC with field current regulation)
Additional Functions
Control power at 120 volts shall be provided from a control
pow
er transformer in each controller. The transformer shall be
protected by current-limiting fuses. Controller(s) shall provide
instantaneous undervoltage protection when momentary
contact push button is used, undervoltage release when
maintained contact push button is used.
(Push button) is to be (mounted on door)
(Switch) (remotely located)
Finish
Finish shall be:
(ANSI-61 light gray over rust-resistant phosphate undercoat
for indoor use.)
(ANSI-61 light gray over one or more rust-resistant phos-
phate undercoats for outdoor use.)
Controllers - CR7160 Vacuum Or Air-Break
Draw Out, 2400-7200 Volt
s
FOR REPLACEMENT APPLICATIONS ONLY
General
These specifications cover NEMA Class E2 high-voltage con-
trol for ____ volts, ____ phase, ____ Hertz motors as follows:
Controller #1:
(Squirrel-cage induction)
(Full voltage) (Non reversing) controller for (Wound-rotor induction)
(Reduced voltage) (Reversing) (Brush-type synchronous)
(Brushless synchronous)
motor rated at ____ horsepower.
Controller #2, etc. (as shown above)
All Controllers
Controller(s) shall be fused type employing current-limiting
power fuses that give the controller an interrupting rating of:
200 MVA, 3-phase symmetrical at 2400 volts, 50/60 Hz
350 MVA, 3-phase symmetrical at 4200 volts, 50/60 Hz
400 MVA, 3-phase symmetrical at 4800 volts, 50/60 Hz
600 MVA, 3-phase symmetrical at 7200 volts, 50/60 Hz
Starter(s) shall employ (vacuum) (magnetic air-break) line
contactor(s) rated 400 amperes, 5000 volts and have an
interrupting capacity of 50 MVA, 3-phase, symmetrical.
Starter(s) shall employ magnetic air-break line contactor(s)
rated 700 amperes, 5000 volts and have an interrupting
capacity of 80 MVA, 3-phase symmetrical.
Controller(s) shall be in a:
one-high line-up of NEMA ____ enclosures with 3-phase
(1000 amp) (2000 amp) AC power bus.
free-standing one-high individual NEMA ____ enclosure(s)
with provision for terminating incoming cable.
two-high construction with NEMA ____ enclosure*, and with
3-phase (1000 amp) (2000 amp) AC power bus.
three-high construction with NEMA ____ enclosure*, and
with 3-phase (1000 amp) (2000 amp) AC power bus.
For safety to personnel, enclosure(s) shall be compartmented
into low-voltage control compartment with separate door,
high-voltage compartment with separate interlocked door,
AC bus compartment with protective barriers and cable
entrance compartment.
Line contactors shall be draw out type.
The controller shall be isolated by externally operated drawout
stabs with shutter mechanism. The isolating device shall
also open the secondary of the control power transformer.
Interlocks shall be provided to prevent (1) inadvertent operation
of the isolation mechanism underload, (2) opening the high-
voltage compartment door without isolating the starter, and
(3) closing the isolation switch with door open.
Note: For overload protection, one three-pole ambient-compensated thermal
overload relay, hand-reset, shall be included.
Options
(Solid-state relay protection)
(Anti-single-phase trip bar)
(Mechanical latching)
Control for Wound-rotor Induction Motors
Secondary control shall be fully magnetic. It shall provide
automatic acceleration through ____ starting steps with
uniform torque peaks using a NEMA Class ____ resistor.
The control shall provide for continuous speed regulation
with ____ point of speed reduction with a maximum
reduction of ____ percent from full-load speed at ____ %
full-load torque.
Control for Synchronous Motors
DC field control for synchronous motors shall consist of one
GE-Multilin SPM star
ting and protection module equipped
with digital displays for power factor, field current and line
current, one field starting and discharge resistor and one
magnetic field contactor. Operation must be fully automatic.