User's Manual

Connecting the Power Supply

2-6 Reader RD21 Installation and Connections

One Reader per power

supply.

Figure 2-4: One Reader per Power Supply Connection.

To connet the power supply to Reader RD21, refer to Figure 2-4 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 TB2 pins marked with the “~” symbol.

4. Connect the main ground connection to the TB2 pin marked with the ground symbol.

5. Switch on the power supply TRM95.

6. Check the voltage on terminal block TB2 (between pins marked with the “~” symbol).

7. Plug terminal block TB2 into its connector TB1.

8. Re-check the voltage on the terminal block TB2 in Step 6.

9. 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.

10. Switch off the power supply.

Note For this installation an isolation transformer is not required. However, if it is installed, the

equipment still can be used in a one Reader per power supply configuration but it should be

connected as if it is a part of a multiple Readers per power supply configuration (see Figure 2-5).

RESET

CNO COM CNC

A B GP Z Y

+ - GND MS I/0

+ 8V DTA PWR

Load

Open

Load

Open

DATA

POWER

TB2

12 Vac 12 Vac

DATA LED

Power LED (optional)

Controller CTL21

S95

S96/S21

Load

Open

Load

Open