Instruction Manual Form 2007 October 1996
Type 304 & 304L
Type 304 and 304L Electrical Position Switch Contents Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .
1 Scope of Manual . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1 Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1
Installation
................................ 3 Mounting the Position Switch on the Actuator . . . 3 Mounting the Position Switch on Other Devices . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4 Electrical Connections . . . . . . . . . . . . . . . . . . . . . . . 5 ............................... 6
Principle of Operation Maintenance
Figure 1. Type 304 Electrical Position Switch with Cover Removed
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Parts Ordering . . . . . . . . . . . . . . . . . . . . . . . . . . . .
8
Parts List
................................. 8 Position Switch Common Parts . . . . . . . . . . . . . . . 8 Terminal Strip Assembly . . . . . . . . . . . . . . . . . . . . . 8 Position Switch Mounting Parts . . . . . . . . . . . . . . . 8 Additional Actuator Parts for Field Mounting . . 22
Introduction Scope of Manual This instruction manual provides installation, adjustment, maintenance, and parts ordering information for the Type 304 and 304L electrical position switches. This manual also provides ordering information for the hardware used to mount the switches on Fisher actuators.
Fisher, Fisher-Rosemount, and Managing The Process Better are marks owned by Fisher Controls International, Inc. or Fisher-Rosemount Systems, Inc. All other marks are the property of their respective owners. Fisher Controls International, Inc. 1987, 1996; All Rights Reserved
Only personnel qualified through training or experience should install, operate, and maintain these position switches. If you have any questions concerning these instructions, contact your Fisher Controls sales office or sales representative before proceeding.
Description The Type 304 and 304L switches are normally mounted on a control valve actuator to operate alarms, signal lights, relays, solenoid valves, or other equipment when valve travel reaches predetermined points. The Type 304 position switch (see figure 1) is for applications that require only one or two switches. The Type 304L position switch is for applications that require three or more switches with a maximum of six switches (see figure 3). The individual switches can be adjusted to operate at any point of travel within the 90 degrees of cam rod rotation.
Specifications Specifications for the Type 304 and 304L electrical position switches are listed in table 1.
D200106X012
Adjustment
W5939 / IL