User's Manual

Connecting the Power Supply
Exciter EX21 Installation and Connections 3-5
Connecting the Power Supply
Power Supply
Connections
The Exciter requires an 22 Vac or 23 to 28 Vdc power source, and a maximum current of 0.5 A. For
more information, refer to
Appendix A, Specifications.
Notes 1. The power connector is located on the LFA21 assembly.
2. Use an electrical wire with at least a 16 AWG gauge to connect the power supply.
3. The Exciter’s main ground connection is on the power supply connector. It is indicated by the
ground symbol. Use an electrical wire with at least a 16 AWG gauge for the main ground
connection.
4. To power the LFA21, we recommend using Lyngsoe’s Power Supply, model TRM95/120V or
TRM95/230V, as required by the local AC power line voltage.
To connect the power supply to the Exciter, refer to Figure 3-3 below.
Figure 3-3: Exciter EX21 Power Supply Connections
Complete the following steps:
1. Remove terminal block TB8 from connector TB7 on the LFA21 board.
2. Run the power supply cable through the cable grip into the plastic enclosure.
3. Connect power wires to the TB8 pins marked with the “~” symbol.
4. Connect the main ground connection to the TB8 pin marked with the ground symbol.
Test
J2
J5
O
L
J4
L
S21
J1
S95
1 2 3 4
TB8
22 Vac 22 Vac