Encoder
Encoder
Encoder Replacement
Replacement
Replacement (25C169)
(25C169)
(25C169)
NOTICE
NOTICE
NOTICE
To avoid damage to the electronic components,
wear grounding strap (Graco Part No. 112190)
and ground appropriately.
Overview
Overview
Overview
The encoder is used by the driver for two purposes.
First, the encoder tells the control board where the
motor is in its mechanical rotation and uses that
information to properly control the motor torque.
Second, it controls stroke length by allowing the
control board to count the number of complete motor
rotations.
Tools
Tools
Tools Required
Required
Required
• 6 mm Hex Wrench
• 0.050 in Hex Wrench
• Phillips Screwdriver (#1)
• Torque Wrench (15 ft-lb, 20 N
•
m)
• Blue (medium) thread locking compound
Prepare
Prepare
Prepare Driver
Driver
Driver
1.
Remove power from the driver. Follow
appropriate lock-out/tag-out procedures. Wait
five minutes before servicing.
2.
Follow the
Pressure Relief Procedure, page 8
.
3.
Decouple the pump lower from the driver per the
system manual.
Remove
Remove
Remove Electronics
Electronics
Electronics Cover
Cover
Cover (When
(When
(When Also
Also
Also
Replacing
Replacing
Replacing the
the
the Encoder
Encoder
Encoder Cable)
Cable)
Cable)
NOTICE
NOTICE
NOTICE
To avoid equipment damage, carefully support the
cover when removing the last bolt. Hold the cover
horizontally and take care that the wires are not
pulled tight.
1.
Remove the 12 bolts (CB) that hold on the
electronics cover using a 6 mm hex wrench.
Place bolts in a safe location.
2.
Pull the cover straight off of the alignment pins
that hold the cover in place.
3.
Support the cover after it has been removed to
prevent putting excess strain on the wires inside.
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3A8124A
