Pump Operation
332291G
25
Pump Operation
The G3 Pump can be controlled using an external, user
supplied, power source and controller.
Refer to the Typical Installation diagrams starting on
page 8 for correct location of the required pump ground
wire and fuses.
NOTE:
•
When using an external power source and control-
ler, Pump ON (Run) Time should be set for no lon-
ger than 30 minutes.
•
In most cases, Pump OFF (Rest) Time should be
twice as long as Pump ON (Run) time. If alternative
ON / OFF times are required, contact Graco Cus-
tomer Service for assistance.
Low Level Output Option
Some G3 pumps without controllers include a Low Level
Output Option. It can be configured with an M12 con-
nector in code location “G” or with a DIN connector in
code location “K”. (See Understanding the Model Num-
ber, page 4.)The low level signal is monitored across
PINS 3 and 4. For PIN 3 and 4 locations and wiring
information the Low Level Outputs diagram, page 15.
NOTE:
A low level warning is triggered when the con-
troller detects PINS 3 and 4 have momentarily closed.
Grease Pumps
When the grease level has reached a low warning level,
PINS 3 and 4 momentarily close (1 time per paddle rev-
olution) sending the signal that the fluid has reached a
low level to the controller.
To ensure that a low level condition has been met, 3 or
more low level triggers must be detected within 1 minute
or less.
See F
IG
. 28 for an illustration of a typical Low Level Out-
put response to low grease level.
Typical Low Level Output Response with Low Level Fluid in Grease Models
F
IG
. 28
200 ms
Open
Contact
Position
Closed
3 s
