Installation Instructions

Installation Instructions Section 5876
Spec. No. 582140000 (Models 802
NLDB, 802NLEB and 802NL-B) Issue AT, April 26, 2013
Chapter 4. Making Electrical Connections Page 4-11
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gently pulling the terminal block from the common housing. This feature facilitates circuit
card wiring and circuit card replacement, if required.
Wires are connected to the terminals by inserting the stripped wire into the wire opening,
and then tightening the screw. The wires should be checked for proper installation by
gently attempting to pull the wires from the terminal. The terminal block accepts a wire
size in the range of 28 to 16 AWG. Recommended torque is 2.0 in-lbs.
To minimize voltage potentials inside the bay during installation, leads should be
connected at the bay first, and then connected to the monitored source.
Analog Input
A 0-50 mv input may be provided. Only connect a 50 mv shunt to this input.
Recommended wire size is 20-22 gauge, twisted pair wire. Observe correct polarity.
Each of the two leads should be protected using a 49.9Ω fusible resistor. The protection
devices should be located as near as possible to the voltage source to provide maximum
protection.
Shunt Inputs: maximum 2,000 ft. loop length.
Recommended Maximum Analog Input Loop Lengths:
These maximum distances are derived from calculations which would yield a
typical 0.1% of full scale error at the maximum loop length (using 22 gauge
twisted hook-up wire). Loop length is the sum of the lengths of the positive
and negative leads.
Note: Program the respective analog input to show up in the DISTRIBUTION LOAD
MENUS or in separate AUXILIARY LOAD MENUS.
Program the scale factor for the shunt connected to this analog input.
Refer to the "INSTALLING THE RECTIFIERS AND INITIALLY STARTING THE
POWER SYSTEM" chapter for programming information.
Analog Output
A 0-50 mv output may be provided. Connect this output to a metering device for remote
plant output current monitoring. Recommended wire size is 20-22 gauge, twisted pair
wire. Observe correct polarity. Each of the two leads should be protected using a 49.9Ω
fusible resistor. The protection devices should be located as near as possible to the
voltage source to provide maximum protection.
Note: Program the scale factor for the analog output as outlined in the "INSTALLING
THE RECTIFIERS AND INITIALLY STARTING THE POWER SYSTEM" chapter.
Binary Inputs
Connect binary inputs as required. Recommended wire size is 20-22 gauge, twisted pair
wire. A 49.9Ω fusible resistor, located in each input lead, may be used to protect leads
from unintentional shorts during installation or service. These resistors should be located
as near as possible to the voltage source to provide maximum protection.
Note: Program the respective binary inputs to alarm in the 'open' or 'close' state as
outlined in the "INSTALLING THE RECTIFIERS AND INITIALLY STARTING THE
POWER SYSTEM" chapter.
If a binary input alarms, the MCA displays a "Binary Input Customer Text
Message" in the I/O Board Alarm Detail Message. If you wish to change the
default message, refer to the "SYSTEM OPERATING PROCEDURES" chapter in
Section 5877.