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Field Installed Power Wiring
An overall dimensional layout for the field installed wiring
entrance into the unit is illustrated in Figure 2. To insure that
the unit's supply power wiring is properly sized and in-
stalled, follow the guidelines outlined below.
Note: All field installed wiring must conform to NEC
guidelines as well as State and Local codes.
Verify that the power supply available is compatible with the
unit's nameplate ratings. The available supply power must
be within 10% of the rated voltage stamped on the name-
plate. Use only copper conductors to connect the 3-phase
power supply to the unit.
CAUTION
Use Copper Conductors Only!
Unit terminals are not designed to accept other types of
conductors. Failure to use copper conductors may re-
sult in equipment damage.
Disconnect Switch External Handle
(Factory Mounted Option)
Units ordered with the factory mounted nonfused discon-
nect switch comes equipped with an externally mounted
handle. This allows the operator to disconnect power from
the unit without having to open the control panel door. The
handle locations and its three positions are shown below;
"ON" - Indicates that the disconnect switch is closed,
allowing the main power supply to be applied at the
unit.
"OFF" - Indicates that the disconnect switch is open,
interrupting the main power supply to the unit controls.
"OPEN COVER/RESET" - Turning the handle to this
position releases the handle form the disconnect
switch, allowing the control panel door to be opened.
WARNING
Hazardous Voltage!
Disconnect all electric power, including remote discon-
nects before servicing. Follow proper lockout/tagout
procedures to ensure the power can not be inadvert-
ently energized. Failure to disconnect power before ser-
vicing could result in death or serious injury.
Once the door has been opened, it can be closed with the
handle in any one of the three positions outlined above,
provided it matches the disconnect switch position.
The handle can be locked in the "OFF" position. While hold-
ing the handle in the "OFF" position, push the spring loaded
thumb key, attached to the handle, into the base slot. Place
the lock shackle between the handle and the thumb key.
This will prevent it from springing out of position.
Installation
An overall layout of the field required power wiring is illus-
trated in Figure 11. These diagrams are representative of
standard applications and are for general reference only. Al-
ways refer to the wiring diagram that shipped with the unit
for specific electrical schematic and connection information.
Main Unit Power Wiring
Table 3 lists the field connection wire ranges for both the
main power terminal block 1TB1 and the optional factory
mounted nonfused disconnect switch 1S14. The unit electri-
cal data is listed in Table 4. The electrical service must be
protected from over current and short circuit conditions in
accordance with NEC requirements. Protection devices
must be sized according to the electrical data on the name-
plate. Refer to the "Power Wire Sizing & Protection Device
Equations", for determining;
a. the appropriate electrical service wire size based on
"Minimum Circuit Ampacity" (MCA),
b. the "Maximum Over current Protection" (MOP)
device.
c. the "Recommended Dual Element fuse size" (RDE).
1. If the unit is not equipped with an optional factory in-
stalled nonfused disconnect switch, a field supplied dis-
connect switch must be installed at or near the unit in ac-
cordance with the National Electrical Code (NEC latest
edition). Refer to the "Power Wire Sizing & Protection
Device Equations" (DSS calculation), for determining the
correct size.
2. Complete the unit's power wiring connections onto either
the main terminal block 1TB1, or the factory mounted
nonfused disconnect switch 1S14, inside the unit control
panel. Refer to the customer connection diagram that
shipped with the unit for specific termination points.
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