greater than 11 kw 15 hp, use power factor
correcting capacitors to increase power factor to
minimum 90 percent.
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ASME A17.1, Section 208, [[worm] geared][ or ][gearless] traction,
direct-drive machines . Paint or finish ferrous surfaces with minimum one
coat of rust-inhibiting paint conforming to manufacturer's standard
practice.
2.3.1
Direct Current Drive Motor
NEMA MG 1, Part 18, hoisting motor with separately excited direct current
(dc) generator. Provide drive motor with Class F insulation, and rated for
continuous duty.
2.4
CONTROL EQUIPMENT
2.4.1
Motor Control Equipment
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NOTE: At sites where power fluctuations are
routinely experienced, specify only variable-voltage
with motor generator set.
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ASME A17.1, Section 210. Provide variable-voltage with motor-generator
set, variable voltage with silicon controlled rectifier (SCR), or
variable-frequency alternating current (ac) drive control. Enclose control
equipment in factory-primed and baked-enamel coated sheet-metal cabinets
with removable or hinged doors with ventilation louvers.
2.4.1.1
Motor Generator Set
NEMA MG 1, Part 18. Provide motor-generator set with Class F insulation,
and rated at 120 starts per hour for elevator service. Maximum acceptable
generator voltage is 600 volts. Indicate direction of rotation by an arrow
painted on the frame. Enclose electric connections at motor generator set
in conduit boxes. Provide adjustable timing device which will
automatically shut the set off at [20 to 30 seconds][3-minute]
predetermined time after the elevator has answered the last registered call.
2.4.1.2
SCR Control or Variable Voltage Variable Frequency (VVVF) AC Control
Provide individual isolation transformers and individual choke reactors for
each individual hoist motor. Provide filtering to maintain harmonic
distortion below IEEE standards as measured at the elevator machine room
disconnect.
2.4.2
Logic Control
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NOTE: Use microprocessors for elevator logic
control. However, in a remote location where
necessary diagnostic tools and qualified service
personnel are not available in the immediate area,
do not allow this type of equipment. In addition,
solid state control is not desirable for any
facility which is subject to an erratic building
SECTION 14210N
Page 16
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