Flowserve 500+ Series Logix - Manual (Page 42)

User Instructions - Logix® 500+ Series Digital Positioners FCD LGENIM0105-10 11/13
flowserve.com 42
14 LIMIT SWITCHES
14.1 Limit Switch Principles of Operation
The Logix 500+ digital positioner can be equipped with a limit
switch unit. The unit has two main parts, the electrical switch
board and the vane. The switch board is connected to the
Inner cover. The vane connects to the feedback shaft which
extends through the positioner and moves with the valve.
The vane can hold a cam or ferromagnetic device. As the
shaft rotates, the pick-up switch LS1 or LS2 is activated. The
switching point can be adjusted.
Four types of Limit Switches can be used with the Logix
500+.
14.2 Limit Switch Types
Mechanical switches are triggered by the use of a
mechanical cam and followers.
Reed switches are triggered by a magnetic force. No
physical contact occurs.
Inductive Slot switches are triggered when the sensor detects
a ferromagnetic vane inserted between the coils. No
physical contact occurs.
Inductive switches are triggered when the sensor detects a
ferromagnetic vane approaching the coils in the switch. No
physical contact occurs.
Table 22: Limit Switch Cross-References
Information IOM Section
Electronic
Specifications
2.7 Limit Switch Specifications
Electronic
Connections
7.4 Limit Switches
Install or Adjust the
Limit Switch
17.4 Installing a Limit Switch
Ordering Limit
Switches
20.2 Spare Parts Kits
Figure 38: Limit Switches
15 REMOTE MOUNT
15.1 Remote Mount Opereation
The remote mount option can be used where excessive
vibration or environmental factors prevent the placement of a
positioner directly on the valve.
The remote mount unit consists of just the feedback
mechanism enclosed in a sturdy container. This assembly is
mounted to the valve/actuator assembly. The actuator tubing
and feedback signals are routed some distance to the
positioner. Tubing is connected to the positioner. The
feedback signal wires are connected to a remote mount
board installed in the Logix 500+ positioner.
Table 23: Remote Mount Cross-References
Information Section Page
Electronic
Specifications
2.6 Remote Mount Specifications 8
Electronic
Connections
7.5 Remote Mount 25
Ordering a
Remote Mount
Board
20.2 Spare Parts Kits 62
Ordering a
Remote Mount
Device
20.5 Mounting Kits 62
For more information on the remote mount option, see Logix
Remote Mount Option user instructions, FCD LGENIM0001.
Figure 39: Remote Mount Board
Limit
Switches
Vane
Terminals
Terminals