Cameron NUFLO 1141C, User Manual

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enters the overcharge (“VoverCharge”) state.
Once VoverCharge is reached, the bulk charger will be left on based on a set period of time at or
above the overcharge voltage. To prevent battery damage, the overcharge state is terminated
immediately if the battery voltage reaches more than 0.5V above the overcharge voltage.
The float state is always entered once the overcharge state is terminated.
The pulse-mode method of charging is done by monitoring the battery voltage and turning the
switch on whenever charging is deemed necessary. A DC supply can be used, provided it is
current-limited to 10A.
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Smart Charger Constant Current / Constant Voltage
When the smart charger is used with the bulk charger, the bulk charger will quickly recharge a
depleted battery to approximately 80% capacity. The smart charger then brings the battery to a
full charge and maintains the charge until bulk charging is once again required.
The smart charger provides up to 3 amps of charging current and delivers a constant current into
the battery until it reaches the programmed overvoltage setpoint. At this point, the charger will
transition to its constant voltage mode, while continuing to deliver charge into the battery until it
is fully charged. The battery is considered to be fully charged when the charging current has
fallen to a preset level (as programmed according to the size of the battery being charged). At this
charge termination point, the charger is switched to float mode, and the programmed float voltage
is maintained by delivering charge to the battery as necessary.
The "trickle state" exists when battery voltage is severely discharged to a point below a preset level
called (“vTrickle”). When the battery voltage is below “vTrickle,” the smart charger will charge the
battery voltage up to the “vTrickle” level at a lower trickle current.
The power supplies on the main board allow the user to input a single variable voltage. The power
supply provides the various regulated voltages required by the RTU. In applications where a lead
acid battery is integral, the power supply recharges that battery. This function can continue whether
the RTU is switched on or not. As applicable, all power supplies report the input voltage and the
battery voltage to the mainboard. This information is available for remote monitoring.
Sealed Lead Acid Battery
A sealed lead acid battery is paired with a temperature-compensated charge controller for charging the
battery. A high-side bi-directional current monitor may be used to measure the current flowing into the
battery (charging) or out of the battery (discharging). It is an optional item that provides a power system
troubleshooting aid.
1. Input Current Limit: 10A maximum
2. Maximum Input Voltage 28 VDC
3. Input Voltage: Transient protection on input
Voltage drop of 3 VDC nominal