3704-001 Installation and User Manual February 6, 2019
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Introduction to Model 3704-A00XX EVSE Unit
The Model 3704 Electric Vehicle Supply Equipment (EVSE) is a 7.2 KW wall- or pole-mounted EVSE with Auto Coil
TM
cable
management retraction, capable of providing up to 30A at 208-240VAC, single phase, 50 or 60 Hz. It is configurable as a
single wall mount, single or dual pole mount. This unit complies with the SAE J1772 specifications for supplying electrical
power to a J1772-compatible Electric Vehicle (EV). The Model 3704 conveniently coils the 20-foot cable internally when not
in use. The Model 3704 is capable of being controlled remotely to apply, reduce or disconnect power to the electric vehicle,
and measures both voltage and current being supplied to the EV. The 3704 communicates directly with a Payment or
Gateway Module, and five status lights clearly indicate the state of the charging operation.
Safety Features
Tamper Resistent - The J1772 power cord and connector are locked mechanically in the storage position.
Jam Resistent - If you pull the charging cable while it is retracting or if the cable gets caught on anything, cable
retraction will stop. The cable will make one additional attempt to retract. Thereafter, pressing and
releasing the switch on the J1772 connector (Figure 19) will restart the cable retraction process
Spark Resistent - Electrical power is not applied to the power connector until the J1772 connector is fully inserted into
the power inlet on the Electric Vehicle and communication between the vehicle and charger has been
established. When the switch is pressed on the J1772 connector, voltage is removed.
Shock Resistent - The Model 3704 EVSE is equipped with a Ground Fault Circuit Interrupter (GFCI) which will disconnect
the electrical voltage from the power cord and connector, should current leakage to ground exceed
20 mA. The GFCI circuit is automatically tested at the start of each charge sequence. The GFCI will
attempt three re-closures to see the ground fault cleared before reporting a problem.
Over Current - The Model 3704 EVSE, when in use, continuously monitors the current being delivered to the EV. Should
the current exceed 32A for 15 seconds, the Model 3704 EVSE will disconnect the power to the EV before
the breaker trips. After disconnecting, the 3704 will auto-reset.
Low-Line - The source voltage to the Model 3704 EVSE is continuously monitored while in use. Should the voltage
drop below 180 VAC, the EVSE will disconnect the voltage from the EV to prevent damage to the EV’s
electronic circuits. When the voltage returns to above 200 VAC, the power will be restored to the EV.
Cold Load Start – If power fails while the Model 3704 EVSE is connected and charging an EV, charging will automatically
resume when power is restored. No user intervention is required. The charging will however, be
randomly delayed from 2 to 5 minutes to prevent the power grid from incurring a large power surge.
Plug-Out Detection - The model 3704 EVSE is equipped with a Plug Out Detection circuit that identifies when the connector
is attached to the electric vehicle. This allows the EVSE to immediately remove electric power from the
electric vehicle before the connector is totally removed from the vehicle inlet.
Disconnect Switch - The 3704 is equipped with an internal disconnect switch for locally shutting off power in the event the
unit needs to be serviced or inspected.
Payment Options
A Payment Module is used with the 3704 EVSE in fee-based electric vehicle charging environments to facilitate commercial
transactions. The 3725-104 Payment Module is engineered to work with the 3704 EVSE, whether the EVSE is single- or dual-
mounted on a pole, or wall-mounted. The Payment Module and EVSE can be located on the same pole, nearby when wall-
mounted, or mounted remotely from each other. Refer to the 3725 User Manual and Installation Guide for more information
about the Payment Module.
Note: A Gateway Module (Model 3727-200) can be used in place of the Payment Module when two-way communication is
required without payment functions. . Refer to the 3727 User Manual and Installation Guide for more information
about the Gateway Module.
