Relay – Transfers L1/L2 to M1/M2
TB1 - Main power/relay power.
L1/N supply power for the circuitry (indicated by amber light) and L1 power for the relay.
L2 from breaker provides additional phase of power to the relay.
ATG is used for an outgoing 120VAC signal, will always energize if voltage is present on TB2.
S is directly connected to the coil of the relay, applying 120VAC here will signal the relay to close.
M1 connects to the orange wire in the STP head.
M2 connects to the black wire in the STP head.
M1/M2 will be different phases sending 220VAC to power the STP motor.
TB2 – Termination points for dispenser hook signals (request for fuel).
8 channels to support 8 dispensers (16 fueling points) for a single product.
Each channel must have an incoming 120VAC signal and a neutral.
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