Medium Voltage Installation
62 CVHH-SVX001A-EN
approved for non-shielded use. If the cable is shielded, the
shielding must be grounded at one end (grounding is
typically done at the starter or supply end).
Care must be taken while routing the incoming cables to
ensure that cable loads or tensions are not applied to the
terminal or premature terminal failure could result.
Motor Terminals
Field-provided, ring-type lugs, with no sharp edges or
corners, must be used by a qualified installer to connect
the power wiring to the motor terminals. Follow all
instructions provided with the field-provided lugs to
ensure proper connections.
Important: The use of stress cones is highly
recommended to reduce and control
longitudinal 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
assembly and prevent applying excessive torque to the
terminal 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 on a 10–13.8kV motor has a copper
shaft that is threaded M14 x 2–6 G. Brass nuts are provided
on the motor terminals to retain the lugs, and the final
connection should be tightened to 32.5–40.7 N·m (24–
30 ft·lb).
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. For
AWG/MCM equivalents in mm
2
, refer to
Table 12, p. 47.
After completing the field connection of wiring, 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.
NOTICE:
Motor Terminal Damage!
Applying torque to the motor terminal when tightening
lugs could cause equipment or property-only damage.
Always use a second wrench to back-up the assembly
and prevent the application of torque to the terminal
shaft.
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