59
Logix
®
520MD+ and 510+ Digital Positioners FCD LGENIM0105-15-AQ – 05/16
flowserve.com
18.5 Replacing the LCD Board
The LCD board connects to the main board providing additional func-
tionality at the local user interface.
Removal
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect power to the positioner.
3. Remove the inner cover by removing the 6 inner cover retaining
screws. See Figure 48.
4. Unscrew the 4 screws holding the LCD Board in place.
See Figure 49.
5. Gently pry the locking feature on the connector with a small flat
screwdriver and separate the connector from the main board. Be
careful not to pull the cable, as this may cause damage to the cable.
Installation
1. Connect the LCD Board to the Main Board using the cable. Ensure
the connector’s locking features engage.
2. Align the LCD Board with the 4 stand-offs on the main board.
3. Screw the LCD Board to the 4 stand-offs.
4. Replace the Inner Cover.
NOTE:
The LCD backlight may change brightness during use. This
is normal. The backlight uses any residual power not used by
other functions of the circuitry. When current supply is low (4mA)
the light will appear darker. When current supply is high (20mA)
the light will appear brighter.
Figure 48: Inner Cover
Figure 49: LCD
18.6 Replacing an Auxiliary Card
Up to two auxiliary cards can be installed at a time. Each communicates
independently to the main processor, though only one cable is used to
connect both cards. See Figure 50.
Removal
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power to the positioner.
3. Remove the main cover.
4. Disconnect the two wire connection from the side of the Card.
5. Unscrew and remove the auxiliary card clips.
6. Gently slide the card from the slot. (If two cards are present,
remove both cards from the slots.)
7. Gently pry the locking feature on the connector with a small flat
screwdriver and separate the connector from the card. Be careful
not to pull the cable, as this may cause damage to the cable.
8. Replace the second card (if present) back into the slot.
9. Replace the auxiliary card clips.
Installation
1. Make sure the valve is bypassed or in a safe condition.
2. Disconnect the power to the unit.
3. Remove the main cover.
4. Unscrew and remove the auxiliary card clips.
5. If a card is present, gently slide the card from the slot to access
the internal connector.
6. Connect the card to the main board using the internal connector
cable. Ensure the connector’s locking features engage.
7. Gently slide the card(s) into the slot(s).
a
CAUTION:
Ensure proper circuitry is used before connecting cables
to the auxiliary card. See section 7 ELECTRICAL CONNECTIONS for
more information.
LCD
Screws
Inner
Cover
Screws
Inner
Cover
Screws