Specifications - State of Delaware

SECTION 262900 - MOTOR CONTROLLERS, CONTACTORS, PUSH BUTTONS, SELECTOR
SWITCHES, INDICATING LIGHTS AND RELAYS: continued
2. Only a single 480Vac, 3-phase, 60-Hz, power input shall be required for all control and
power. The controller input shall be rated 460V (+10% to -10%), three-phase, and 60-Hz
(+2% to -2%). The converter shall utilize a three-phase, full-wave, diode bridge. Provide
6 pulse unit. Provide fused 120V control power transformer on line side of converter.
Control power transformer shall be sized for controls, space heaters, and air conditioners
(if air conditioning is necessary because of ambient conditions.) The controller shall
maintain a minimum lagging power factor of 0.95 at any speed or load. The controller
shall have input line filtering in compliance with IEEE 519 and shall not generate
harmonics of a magnitude that create power line disturbances objectionable to the local
utility. Provide an input power isolation transformer UL-listed for nonlinear loads
(UL 1561) with the proper "K" rating in a NEMA Type 1 enclosure, if necessary, to limit
the total harmonic voltage and current distortion to valves in IEEE 519 Tables 10.1 and
10.3.
3. Provide integral main thermal magnetic circuit breaker or main motor circuit protector
with AIC RMS SYM rating at rated voltage as indicated. Manufacturer shall size and
coordinate the main protective device with the characteristics of the controller, motor and
load furnished to provide proper protection by the main protective device, without
nuisance tripping. The main circuit protective mechanism shall have a door interlocked,
padlockable handle mechanism suitable for up to three padlocks. Provide current
limiting fuse for short circuit current protection of the converter. Provide controller trip
and visual indication in door for each of the following: control logic malfunction, output
motor overload, output ground, output short circuit, input instantaneous overload, input
inverse time overload, input overvoltage, input under-voltage, input phase-loss, input
over-frequency, cabinet over-temperature and ac input surge. Unit shall trip if 150% of
motor full load current (or more) is drawn for 4 minutes. The controller shall be able to
withstand a phase-to-phase short circuit at the output terminals without any component
failure.
4. The DC voltage shall be inverted with a pulse width modulated (PWM) transistor inverter
to an adjustable frequency output. The output frequency stability to be +1.0% to -1.0%
and the output voltage regulation to be +2% to -2%.
5. Provide the following features: Provide internal factory wiring and wiring terminal strips
field for the following located remote from the unit:
a. Two remote stops.
b. One remote start.
c. One remote speed control potentiometer.
d. One remote bypass on-off input.
e. Remote-Local-Off selector switch position output.
f. Manual-Off-Automatic selector switch position output.
g. Speed range from 30 Hz to 60 Hz.
h. (0-10Vdc) (4-20 mA DC) (3-15 psig) analog input process signal follower.
6. Provide the following on the door of the unit:
a. Power ON indicating light.
b. Motor running green indicating light.
c. Motor not running red indicating light.
d. Output digital frequency meter calibrated in hertz.
e. Minimum speed potentiometer (30-40 Hz).
f. Provide low speed boost for low speed starting of motors.
g. Maximum speed potentiometer (40-60 Hz).
DEAN262900.DOC 262900-5