57
Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
18 MAINTENANCE AND REPAIR
The kits listed in section 21.2 Spare Parts Kits can be replaced by a
technician trained in positioner function and handling of static sensi-
tive devices.
a
CAUTION:
Depressurize the positioner before servicing.
a
CAUTION:
Use eye protection.
a
CAUTION:
When touching the circuit boards, observe precautions
for handling electrostatically sensitive devices.
18.1 Scheduled Maintenance
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.
18.2 Required Tools and Equipment
The Logix 500+ digital positioner has modular components that can
be replaced using the tools shown in Figure 46.
Figure 46: Tools for Positioner Maintenance
The spool, block and manifold of the double acting relay can be
cleaned using acetone, a soft cotton cloth and cotton swabs.
18.3 Torque Specification for Screws
Table 26: Torque Specification for Screws
Outer Cover (4 Screws)
1.7 N-m (15 in-lb)
Limit Switch (3 Screws)
0.56 N-m (5 in-lb)
Limit Switch Vane (2 Screws)
0.34 N-m (3 in-lb)
Inner Cover (6 Screws)
0.34 N-m (3 in-lb)
LCD (4 Screws)
0.34 N-m (3 in-lb)
Main Board (2 Screws)
0.34 N-m (3 in-lb)
Pressure Board ( 6 Screws)
0.68 N-m (6 in-lb)
Double Acting Relay Block ( 2 Screws)
0.56 N-m (5 in-lb)
Double Acting Relay manifold (2 Screws)
0.56 N-m (5 in-lb)
Single Acting Relay (2 Screws)
0.56 N-m (5 in-lb)
Main PCB, MFC, V to I & Limit switch terminal
connections.
0.5 – 0.6 N-m (4-5 in-lb)
18.4 Installing a Limit Switch
The Logix 500+ 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. See
Figure 47.
For electrical connection diagrams, see Table 15: Limit Switch
Connections. For electrical specifications, see Table 7: Limit Switch
Specifications.
c
DANGER:
For units installed in hazardous areas special instal-
lation 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. Attach wires to terminals. .
8. Check the two switching points and repeat the adjustment steps
1 to 6, if necessary.
9. Replace the outer cover.
Philips Screwdriver #2
Philips Screwdriver #1
Slot Screwdriver (< 3.5mm)
2.5 mm Hex Key
2.0 mm Hex Key
