User's Manual

Connecting the Power Supply
Reader RD21 Installation and Connections 2-7
Multiple Readers per
power supply.
Figure 2-5: Multiple Readers per Power Supply Connection.
To connet the power supply to Reader RD21, refer to Figure 2-5 and complete the following steps:
1. Unplug terminal block TB2 from its connector TB1.
2. Run the power supply cable through the cable grip into the Reader’s enclosure.
3. Connect the power wires to the input of the transformer using terminal block pins marked
12Vac as shown in the Figure 2-5.
4. Connect the output of the transformer to TB2 pins marked “~” using the terminal block as
shown in Figure 2-5.
5. Run the main ground connection to TB2 using terminal block pin marked GND as shown in
Figure 2-5.
6. Run the power cable to another Reader if required.
7. Switch on the power supply TRM95.
8. Check the voltage on terminal block TB2 (between pins marked with the “~” symbol).
9. Plug terminal block TB2 into its connector TB1.
10. Re-check the voltage on the terminal block TB2 in Step 8.
11. Check the MBD21 to see whether the POWER LED goes ON, and the DATA LED stays ON
continuously for 6-7 seconds and then turns OFF.
RESET
CNO COM CNC
A B Z Y
A B Z Y
+ - OS I /0
+ 8V DTA PWR
J1
Load
Open
J2
Load
Open
DATA
POWER
Controller CTL21
J2
S95
S21
J3
J1
Load
Open
Load
Open
TB2
GND
22Vac
12Vac
To Power
Supply
~ ~
To another
Reader
12Vac