Motor Terminals
Field provided ring type lugs, with no sharp edges or
corners, must be used by a qualified installer to con-
nect the power wiring to the motor terminals. Follow
all instructions provided with the field provided lugs to
ensure proper connections. The use of stress cones is
highly recommended to reduce and control longitudi-
nal and radial electrical stresses at the cable ends. Prior
to assembly the terminal stud, nuts, and lug should be
inspected and cleaned to ensure they are not damaged
or contaminated. When attaching starter leads to 2.3–6.6
kV motor terminals, the M14x2 brass jam nuts should be
tightened to a maximum torque of 32.5–40.7 N·m (24–30
ft·lb). Always use a second wrench to backup the assem-
bly and prevent applying excessive torque to the termi-
nal shaft.
Note:6.0kV and 6.6kV motors on 6800 or 6800L frames
(see compressor model number for motor frame) use
the same motor terminals as the 10kV–13.8kV motors.
The motor terminal has a copper shaft that is threaded
9/16” - 18 UNF2A. Brass nuts are provided on the motor
terminals to retain the lugs, and the final connection
should be tightened to 22–25 ft·lb (30–34 N·m). using a
7/8” (22 mm) socket on a torque wrench.
D
NOTICE
Motor Terminal Damage!
Do not apply torque to the motor terminal when
tightening lugs. Always use a second wrench to
back-up the assembly and prevent the application
of torque to the terminal shaft. Failure to follow this
instruction could cause equipment or property-only
damage.
Before beginning wiring and torquing, ensure proper
motor terminal care and do not apply any excess stress.
Ground Wire Terminal Lug
A ground wire lug is provided in the motor terminal box
to allow the field connection of an earth ground. The
lug will accept a field supplied ground wire of #8 to #2
AWG size. After the field connection of wiring is com-
plete inspect and clean the motor terminals and motor
housing, and remove any debris before reinstalling the
motor terminal box cover. The cover must be re-installed
onto the motor terminal box and all bolts installed. Do
not operate the chiller with the motor terminal box cover
removed or with any loose or missing cover bolts.
48
10kV–13.8kV Medium Voltage Installation
RELEASED 10/Mar/2020 06:59:20 GMT
