Model 250 used with 1 unit. Connection Instructions See Figure

Figure 1

Wiring 2 units (adjustable voltage on unit #1)

Operation:

1.Plug power supply into octal socket.

2.Turn on power source.

3.Voltage adjustments are made by removing plug button on top of power supply case. This will expose a screwdriver slotted adjustment. Turn the adjustment clockwise to increase voltage, or counterclockwise to decrease voltage. When wired as described above, the adjusted voltage will be applied across unit #1.

4.With switch in position P1, unit #1 is energized with adjusted voltage and unit #2 is de-energized.

5.With switch in position P2 (normally closed), unit #2 is energized with 100 VDC and unit #1 is de- energized.

6.If unit fails to operate, refer to the Troubleshooting section.

Note: If unit #1 is energized with fixed 100 VDC, and unit #2 with adjustable DC voltage, remove lead between terminal 2 of octal socket and P2b of switch. Add lead between terminal 2 of octal socket and P1b of switch.

Model 250 used with 2 units – adjustable voltage on both units.Connection Instructions (See Figure 2):

1.All connections are made to terminals on octal socket.

2.Connect unit #1 to terminals 6 and 8.

3.Connect unit #2 to terminals 3 and 6.

4.Connect a SPDT switch to terminals 3, 7, and 8;

the switch common must be connected to terminal

7. A maintained-contact type SPDT switch should be used.

5.Connect 115 VAC, 50-60 Hz to terminals 1 and 5. Warning: The neutral or grounded side must be connected to terminal 5.

Figure 2

Wiring 2 units (adjustable voltage on both units)

Operation:

1.Plug power supply into octal socket.

2.Turn on power source.

4.With switch in position P1, unit #1 is energized with adjusted voltage and unit #2 is de-energized.

5.With switch in position P2 (normally closed), unit #2 is energized with adjusted voltage and unit #1 is de-ener-gized.

6.If unit fails to operate, refer to the Troubleshooting section.