User's Manual

Connecting the Power Supply
Exciter EX21 Installation and Connections 3-5
The Exciter requires a 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.
5. There are two basic types of installation: one Exciter per power supply and multiple Exciters
per power supply.
One Exiter per power
supply.
To connect the power supply to the Exciter, refer to Figure 3-3.
Figure 3-3: One Exciter per Power Supply Connection.
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.
TB8
22 Vac 22 Vac
Test
J2
J5J4
J1
1 2 3 4
S96
S21S95
L
O
L
O