Application Guide

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 4-9
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MCA EXTERNAL ALARM, REFERENCE, AND CONTROL
CONNECTIONS AND MCA I/O CIRCUIT CARD CONNECTIONS
Note: For recommended wire size and alarm relay contact ratings, refer to System
Application Guide SAG582140000. The SAG can be accessed via the CD
(Electronic Documentation Package) furnished with your system.
Refer to Figure 4-4 for connector locations and pinouts.
Connections to Terminal Block TB1 on MCA Circuit Card P/N 509478
MCA circuit card P/N 509478 is located inside the Primary Power/Distribution or Power
Only Bay. Refer to Figure 4-4 for location and connector TB1 pinouts. Terminal block
TB1 on MCA circuit card P/N 509478 consists of two pieces snapped together. The two
pieces can be separated by first loosening the two screws; then gently pulling the one
half from the other. This feature facilitates circuit card wiring and circuit card
replacement, if required.
Wires are connected to the terminals of TB1 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.
Procedure
1) External Voltage Input (for MCA Alarms and Meter Reading): Leads can be
extended from the MCA to an external voltage source. This is the voltage source
the MCA monitors for system alarms and displays as "System Output Voltage".
If leads are not connected, the MCA automatically senses voltage internally.
Warning: Equipment damage may result if leads are connected to the
wrong terminals of TB1.
If desired, extend leads from the battery or other external voltage point to
terminals 1 (negative) and 2 (positive) of TB1. The negative lead should be
fused at 1-1/3 amperes.
2) Remote Test/Equalize: Customer-furnished loop closure applied between
terminals 3 and 4 of TB1 places all Rectifiers in all bays comprising the power
system in the test/equalize mode of operation. Removal of the signal places all
Rectifiers in the float mode of operation.
3) Remote High Voltage Shutdown: Customer-furnished loop closure applied
between terminals 5 and 6 of TB1 activates the high voltage shutdown circuit on
all Rectifiers in all bays comprising the power system.
4) Test Input: The Remote High Voltage Shutdown and/or Rectifier Emergency
Shutdown (ESTOP) circuits can be tested without affecting the system by
applying a Test loop closure between terminals 7 and 8 of TB1 before applying
the Remote High Voltage Shutdown or Rectifier Emergency Shutdown loop
closure signal. Removal of the Test loop closure signal enables normal
operation of the Remote High Voltage Shutdown and/or Rectifier Emergency
Shutdown circuits.
a) Navigate to the "VERIFY TEST, ESTOP,& HVS INPUTS" MCA menu
item.
Test Procedure
b) Apply the Test loop closure. Verify MCA displays TEST SHUTDOWN
INPUT IS ON.