Eaton Cutler-Hammer FP-5000, Instructions Manual

Page: 101 / 187

Page 6-3
IL17569
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6.3 Wiring – General
The main electrical interconnections are made from the rear of the
outer case of the FP-5000. The mounting and wiring can be done
with the inner chassis withdrawn from the outer case. Terminal lugs
should be used to wire to the FP-5000. The terminal lugs are
inserted by loosening the screws of the terminal blocks mounted on
the rear of the outer case.
When routing wires between the FP-5000 and the associated
machine or process equipment, follow these guidelines:
• Do not route the control wiring through the high voltage compart-
ment of the gear in which the FP-5000 is mounted.
• Separate the lower voltage connections from the higher voltage
(440V AC or higher) conductors as much as possible. In general,
maintain a minimum distance of 1.5 feet (45 cm) between
the two types.
• Any low voltage control wiring routed out of the cabinet should be
at least #18 AWG stranded copper wire, AWG maximum.
• Any Ct wiring routed out of the cabinet should be at least #14
AWG stranded copper wire, 10 AWG maximum.
• Communications circuits may use thinner conductors, as
recommended in installation literature for those circuits.
Figure 6-3. FP-5000 IQ Cutout Retrofit Mounting
WARNING
BEFORE WORKING WITH THE WIRING, MAKE SURE POWER
IS DISCONNECTED FROM THE FP-5000, AND ALL REMOTE
CONNECTIONS INCLUDING CONTACT OUTPUT CONTROL
CIRCUITS AND REMOTE INPUT CONTACTS. OTHERWISE,
HAZARDOUS VOLTAGES COULD CAUSE INJURY OR DEATH.
ALSO, UNEXPECTED CONTROL ACTION COULD INJURE
PERSONNEL OR DESTROY EQUIPMENT.
Figure 6-5 shows FP-5000 rear terminal connections.
Connect ground terminal shown in lower left-hand corner of rear
panel (see
Figure 6.4 ) to the closest solid electrical-safety
grounding point with a heavy wire or braid (#14 AWG or larger). Do
not use a current-carrying or neutral conductor for this grounding.
6.3.1 Ct Wiring TB4
Carefully read the advice in Section 6.6.2 on choice of Ct ratios for
a given particular application. An inappropriate Ct ratio will result in
poor measurement accuracy and limited protection. More serious
errors in ratio choice will make it impossible to set the relay properly.
Connect the phase and optional ground Cts as shown in Figure 6-8 .
Pay attention to the phase identification and sequence, and check
for consistent polarity among the three phases. The FP-5000
unbalance protection will pick up and operate if two phases are
swapped, or if the polarity of any Ct is reversed with respect to the
other two. See
Figure 6-10 for other common wiring configurations
such as 3-phase 3-wire, 3-phase 4-wire, 3-phase 3-wire with ground
fault protection.