MKS 260 PS-7, Instruction Manual, Page: 27 / 53

Chapter One: General Information Introduction
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Chapter One: General Information
Introduction
The MKS Type 260 PS-7 Power Supply provides all of the necessary voltages to operate the
MKS Type 1153 Mass Flow Controller and the MKS Type 243A Controller and Readout.
The 260 PS-7 unit provides the ±15 VDC ± 5% @ 1 amp required to power the pressure
transducers in the 1153 MFC and to power the 243 controller, as well as the 24 VAC @ 8 amps
required to power the heater in the 1153 unit.
The ±15 VDC power is isolated using a toroidal transformer and is generated by two separate
switching regulators and filtered with two toroid inductors. The output of the filtered DC voltage
is then connected to a linear regulator to further filter and regulate the DC voltage. The DC
power is available on two 9-pin Type “D” connectors.
The 24 VAC power is provided by a toroidal transformer. The transformer is multi-tapped to
handle a wide range of input power voltages. The AC power is available though a 15-pin Type
“D” connector.
The input operating voltage range for the unit is 90 to 250 VAC @ 50 to 60 Hz. Four user-
selectable voltages are available by changing the Line Voltage Selector in the Power Entry
Module on the rear panel of the unit (refer to Figure 7, page 32). The available voltages are
100 V, 120 V, 200 V, and 240 V. The fuses are also located in the Power Entry Module; the fuse
value for each voltage level is listed on the voltage/fuse label (refer to Figure 9, page 34).