Valve; Trigger; Encoder - Graco InvisiPac HM25 Operation, Repair, And Parts

Valve

Problem
System reset when guns
fire
No glue dispensed

Trigger

Problem
Trigger always on/off
Trigger detects multiple
times on one box
Trigger sensor turned off
(no 24VDC present)

Encoder

Problem
Encoder speed is negative Encoder travel direction is
Encoder speed varies sig-
nificantly
Encoder reads wrong
speed
Encoder does not read line
speed
Line speed is fixed
334784G
Cause
Current draw from combined valves
exceeds power supply rating (150 W)
Solenoid shorted
Wrong type of valve in use
Cause
Sensor is covered/misaligned
Polarity is backwards
Improper sensor type/installation
Trigger not adjusted properly or arti-
facts on the object being sensed
cause false detection
Excessive current drawn from
24VDC supply on
Cause
reversed
Encoder coupling is slipping
Encoder is improperly scaled
Encoder movement not propor-
tionately scaled to path of prod-
uct
Improper senor type/installation See Installation - Encoder Installation for proper sen-
Wrong line mode selected
Fixed line speed mode selected
Ensure current draw is below 6A total between all
simultaneously firing valves
Ensure proper wiring between solenoid and pat-
tern controller. If no shorts found, consider replac-
ing solenoid.
Pattern controller is only compatible with 24 VDC
solenoids (no electric valves or AC solenoids)
Clear any sensor obstruction and verify sensor
changes states with object present/absent
Change Trigger Polarity in PC Setup - Trigger
Setup. See Trigger Setup, page 31
See Installation - Trigger Installation for proper sen-
sor selection/installation
Set Minimum Product Length
Event Map. See Event Map, page 29.
Perform power cycle to reset power to 24 VDC pins
If error persists, remove components and power
cycle until component with excessive current draw
is discovered
Solution
Exchange A and A' wires with B and B' wires
Flip encoder to spin the opposite direction
Improve encoder coupling to line by using different
bracket, mounting, coupling, etc.
Perform calibration routine found in Calibration - Line
Speed. See Calibration, page 40
Remount encoder to ensure ratio between encoder
movement and product movement is always a fixed
proportion
sor selection/installation
Select encoder line mode setting on PC Setup - Line
Mode. See Line Mode, page 30
Select encoder line mode setting on PC Setup -
Line Mode. See Line Mode, page 30
Troubleshooting
Solution
Solution
in PC Setup -
47