User Instructions - Logix® 520MD+ Series Digital Positioner
FCD LGENIM0105-00
© Flowserve Corporation
37
Field Trial Version – Printed October 28, 2011
16 MAINTENANCE AND REPAIR
The kits listed in section 19.2 Spare Parts Kits can be
replaced by a technician trained in handling of static
sensitive devices and positioner function.
CAUTION: When touching the circuit boards, observe
precautions for handling electrostatically sensitive devices.
16.1 Scheduled Maintainance
The supply gas filter(s) should be scheduled for regular
maintenance as required to maintain supply gas quality. If
contamination is found in the filter, the inside of the
positioner should be visually inspected for contamination.
If contamination is found in the positioner, the positioner
should be replaced.
16.2 Installing a Limit Switch
The Logix 520MD digital positioner can be equipped with
an additional limit switch unit. Part of the switching unit
attaches to the feedback shaft. The sensors attach to the
inner cover. Connections to the limit switch are
independent of other connections to the positioner.
For electrical connection diagrams, see Table 13: Limit
Switch Connections. For electrical specifications, see
Table 10: Limit Switch Specifications.
WARNING: For units installed in hazardous areas
special installation cautions and procedures are required.
The installation of hazardous location electrical equipment
must comply with the procedures contained in the
certificates of conformance. Country specific regulations
may apply. Electrical safety is determined only by the
power supply device. (Positioner operation with limited
voltage only).
Installation
1
Remove the outer cover.
2
Place the limit switch board (1) onto the Inner cover
(2) and secure it with 3 mounting screws (3).
3
Install vane assembly (4) and secure with 2 screws
(5).
Adjusting Switches
1
Loosen the two screws on the vane (5).
2
Stroke the valve to the first switching position.
3
Set the switching point of the limit switch by adjusting
the lower vane for the lower switch (LS2).
4
Stroke the valve to the second switching position
(LS1).
5
Set the switching point of the limit switch by adjusting
the vane for the upper switch.
6
Tighten the two screws on the vane (5).
7
Check the two switching points and repeat the
adjustment steps 1 to 6, if necessary.
Figure 23: Limit Switch
2
1
4
5
3
Summary of Contents for Logix 520MD+
Page 53: ......
