DRAKE PS7 1502 Instruction Manual - Page 5

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Overvoltage Protection

If the PS-7 regulator section should fail or one of the pass tran-

sistors should short, the unit will automatically shut down. If the

DC output voltage should soar above 16 VDC, an SCR crowbar

clamps the output to ground to protect the load and open the pri-

mary fuse. This fuse should b e replaced with another of the same

type and rating after determining the cause of the overload.

The PS-7 comes factory set for 120 VAC 50-60 Hz operation. To

change the primary input range, simply remove the four screws

holding the programming plate. Refer to Figure 2. As an example,

suppose the line voltage measured 200 VAC. Remove the plate

and slide the voltage switch to 200/240. Then slide the HI/LO

switch to LO. Rotate the plate until 200 shows up in the window

and the LO switch fits through its locator hole. Reinstall the four

screws. If 200 or 240 VAC operation is desired, he sure to replace

the fuse with a 4 amperc type M TH fuse.

Fig. 2-PS-7 Line Voltage Programming

100

200

100

200 P 240

100

200 cl 240

120

120vac +-lO% 50-60 Hz

Range:108-132vac

240

1OOvac +-lO% 50-60 Hz

Range:90-110vac

240vac +-l0% 50-60 Hz

120

Range:216-264vac

120

200vac +-lO% 50-60Hz

Range:180-220vac

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