Graco HFRL Setup And Operation Manual page 36

Setup
15. Connect customer start signal (Optional).
A start signal can be initiated remotely by providing a
dry contact closure across pins #1 and #3 of connector
2B.
2B
The connection can be made using the customer signal
cable (120955) provided with the machine and making
contact between the brown (#1) and blue (#3) wires.
The black wire is connected to pin #4 and is not used
for customer connection.
NOTICE
To avoid personal injury and machine damage, do
not make a connection to the black wire (pin #4)
stated above.
For reference, see the Motor Control Module (MCM)
schematic found in the HFRL and HFRS Repair-Parts
manual.
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