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Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
14 V TO I CARD
The optional V to I card allows the use of a DC voltage source (e.g.
24 Volts) to power the positioner. This is typically for on/off emer-
gency shut-down valves. The positioner is left in digital mode and the
position is commanded by the DTM or Hand-Held. The positioner can
receive commands via HART. Partial stroke tests can be performed via
HART commands. Reducing the voltage to below 10 volts causes the
positioner to shut down and go to the fail safe position.
The V to I card is immune to RFI/EMI disturbances. See certifications
in section 3.
Table 23: V to I Card Cross-References
Information
Section
Page
V to I Card Specifications 2.8 V to I Board Specifications
11
Certifications
3 Hazardous Area Certifications
13
Electronic Connections
7.4 V to I Card Connections
31
Safety Function
17 Requirements for Safety Integrity 55
Ordering Limit Switches
21.2 Spare Parts Kits
80
Figure 43: V to I Card
15 LIMIT SWITCHES
15.1 Limit Switch 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 activat-
ed. The switching point can be adjusted.
Four types of Limit Switches can be used with the Logix 500+.
15.2 Limit Switch Types
Mechanical switches are triggered by the use of a mechanical cam
and followers. See Figure 44: Limit Switches.
Reed switches are triggered by a magnetic force. No physical contact
occurs.
Inductive Slot switches are triggered when the sensor detects a ferro-
magnetic vane inserted between the coils. No physical contact occurs.
Inductive switches are triggered when the sensor detects a ferromag-
netic vane approaching the coils in the switch. No physical contact
occurs.
Table 24: Limit Switch Cross-References
Information
Section
Page
Electronic Specifications
2.7 Limit Switch Specifications
11
Certifications
3 Hazardous Area Certifications
13
Electronic Connections
7.5 Limit Switches
32
Install or Adjust the Limit Switch 18.4 Installing a Limit Switch
57
Ordering Limit Switches
21.2 Spare Parts Kits
80
V to I Card