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Page 6-1
Effective 10/02 IL17562BH04
SECTION 6—INSTALLATION AND WIRING
6.1 Mounting
The following subparagraphs describe the mounting of the MP-3000
relay, as well as its optional URTD module and PONI Communications
module.
6.1.1 Mounting the MP-3000
Mount the unit vertically on a flat panel. The location should be as free
as possible of water, chemicals, dust, and excessive heat and
vibration. The panel should protect the user from accidental contact
with live terminals on the back of the MP-3000. A 1/8 inch steel panel
or door, solidly grounded, is recommended.
Before actually cutting the panel, check the required three-dimensional
clearances for the MP-3000 case, particularly behind the panel. See
dimensions in Figures 6.2 and 6.3. If mounting on a swinging door,
check the swinging clearance of rear projections and wired connec-
tions.
Figure 6.1 shows dimensions for the panel cutout and mounting holes.
Cutout tolerances and mounting screw hole placement are critical. In
particular, the tolerance of the horizontal dimension between the center
of the mounting holes and the vertical edge of the cutout must be
between 0 and +0.050 in. (0.13 cm).
NOTE: The cutout is the same as for the previous-generation IQ 1000 II
motor relay, and other Cutler-Hammer IQ products of this case
size. The six mounting holes which secure these older
products are still correctly located for the MP-3000, but the four
additional new holes should be added.
Secure the MP-3000 to the panel with the special self-tapping plastic
screws. Use moderate torque - 8 inch pounds. Use the 0.375-inch-
long (0.75 cm) screws supplied with the relay to mount the unit on a 1/8
inch panel. Do not attempt to tap the holes. Do not use machine
screws.
6.1.2 Mounting the URTD Module
The optional URTD module provides temperature data to the MP-3000
from up to 11 RTDs embedded in the motor and driven equipment.
See URTD I.L. 17367.
The URTD module may be mounted either on the back of the MP-3000
by using the URTD mounting bracket and machine screws (supplied
with the URTD module), or mounted remotely from the MP-3000. If
mounting the URTD module on the back of the MP-3000, see Figure
6.3 for overall depth dimensions. See Figure 6.4 for URTD stand-alone
mounting dimensions.
Consider the benefit of mounting the URTD module away from the MP-
3000, as close as possible to the motor. The big bundle of RTD wires
becomes much shorter. The URTD conveys multiplexed temperature
data back to the relay via a single optical fiber (recommended) or by a
3-wire communications conductor. The URTD may be placed up to
400 feet from the MP-3000 with the optical fiber connection (recom-
mended), or up to 500 feet away with a wired communications
connection. Note that the URTD will require 120 Vac power (6 VA) at its
remote location. It may be mounted in any orientation.
6.1.3 Mounting the PONI Communications Module
See Section 10 for a description of the various types of optional PONI
communications modules which can be used with the MP-3000.
Check the I.L. for the selected PONI to confirm dimensions and
communications network connection requirements.
Figure 6.3 shows clearance dimensions to the rear for an I-PONI, B-
PONI, or D-PONI. An E-PONI is 0.5 inch deeper.
The PONI, if used, is always mounted on the back of the MP-3000. If no
URTD is mounted there, use the mounting bracket supplied with the MP-
3000 as shown in Figure 6.3. The bracket gives a convenient space to
run ct wires underneath the PONI to the adjacent Ct terminal block.
If a URTD is mounted on the back of the MP-3000, the PONI piggybacks
directly to the URTD module as shown. Use the machine screws
supplied with the PONI in the molded plastic mounting holes of the
URTD.
6.2 Wiring—General
When routing wires between the starter and the associated machine or
process equipment, follow these guidelines:
• Do not route the control or RTD wiring through the high-voltage
compartment of the motor starter. However, the starter manufac-
turer may be able to recommend or provide specific measures for
doing this if really necessary.
• Separate the lower voltage (120 Vac) from the higher voltage
(440 Vac 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 motor starter
cabinet should be at least #14 AWG stranded copper wire.
• Communications circuits may use thinner conductors, as recom-
mended in installation literature for those circuits.
WARNING
BEFORE WORKING WITH THE WIRING, MAKE SURE POWER IS
DISCONNECTED FROM THE MOTOR STARTER, MP-3000, AND
ALL REMOTE CONNECTIONS INCLUDING CONTACT OUTPUT
CONTROL CIRCUITS AND REMOTE INPUT CONTACTS. OTHER-
WISE, HAZARDOUS VOLTAGES COULD CAUSE INJURY OR
DEATH. ALSO, UNEXPECTED MOTOR CONTROL ACTION COULD
INJURE PERSONNEL OR DESTROY EQUIPMENT.
Figure 6.5 shows MP-3000 rear terminal connections.
Connect terminal 5 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.
Do not tie terminal 5 to neutral terminal 7 at the relay. Note that
terminal 5 is internally connected to the outer case and to the conduc-
tive faceplate of the relay.
6.2.1 Ct Wiring
Carefully read the advice in Section 5.1.5 on choice of Ct ratios for a
particular motor 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 6.6.
Pay attention to the phase identification and sequence, and check for
consistent polarity among the three phases. The MP-3000 may not
allow the motor to run, and cannot protect properly, if two phases are
swapped, or if the polarity of any Ct is reversed with respect to the
other two.
Pass the motor phase conductors through the window of the flux-
canceling ground Ct. The ground Ct need not have any particular polarity
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