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Charger, 15 A 16 cell LiFePO4 Pack, PFC, CAN-Enabled

Part# 1941

Smart, 16 cell LiFePO4 charger with CAN and digital BMS integration options. It is also Power Factor Compesation (PFC) making it very efficient.
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Description

Suitable for charging LiFePO4 lithium ion battery packs such as those used in electric vehicle applications. It is designed to work with Battery Management Systems (BMS) through CAN interface or digital input for safe battery charging. Standard safety features include protection against a short circuit on the charger output, reverse polarity, over charging, over temperature, etc.

 

Specifications:

• Intended for 16 cell LiFePO4 pack

• Input Voltage: 85 to 242 VAC

• Output Voltage: 56.8V / 15A DC

• Maximum Output: 15A

• Power factor: ≥99%

• Efficiency: ≥92%

• Frequency range: 45 ~ 65Hz

• Communication: CAN and 12V Digital Input

 

Operating Environment:

• Altitude: ≤2000 Meters

• Temperature: -35°C ~ 65°C

• Storage environment: -40°C ~ 100°C – Keep away from combustible materials

• Vibration: SAEJ1378

• Water resistance: IP31

• Installation Stress: ≤ level 5

• Humidity: 5% ~ 70% RH – Non Condensing, keep away from exposure to moisture

 

Alarm Indication

• Reverse polarity or low voltage: light blinking, 20% light on

• Charger over heating: light blinking, 40% light on

• Ambient temperature too high: light blinking, 60% light on

• Charging time out: light blinking, 80% light on

• Over Voltage Protection: light blinking, 100% lights on

• BMS alarm/charging interruptions All LED’s blinking

 

Charging Status Indication

• Shutdown status: Six lights blinking

• Charging stage: Percent light indicating pack voltage vs. max charging - voltage

• Battery presence not detected: Red light blinking, 20% light on

• Charging complete: All green lights on

 

Output short circuit protection

 

Over-temperature protection:

-Temperature less than 85°C – Full charging power

-Temperature is 85°C to 95°C – Power reduced to 50%

-Temperature is greater than 95°C – No output

 

Reverse polarity protection:

charger will not turn on if the battery pack is connected backwards (or less than 5V).

 

A switch on the charger marked “Override” is used to select either external or internal controlled charging.

*Override Off – Use with BMS system, either CAN or digital input

*Override On – Charger program based on pack voltage only (recommended for testing purposes only, do not use for normal charging).

 

When external control is selected and a CAN signal is used, if any cell reaches the recharge set point (default 3.7V as signaled by the BMS) the charger will automatically enter the final recharge cycles.

 

Recharge cycles: When the BMS detects any cell has reached the recharge set point (default 3.7V) or above, the charger reduces the charge current to zero amps for five minutes to allow the BMS to balance the battery pack. The charge will resume after five minutes at half the previous charge current and will again charge until it receives a signal from the BMS that a cell has reached the recharge set point. These recharge cycles continue until the charging current reaches the minimum charging current to complete the charging process.

 

Digital alarm input:

*0.0V – 2.0V: Charging stopped

*2.5V – 12.0V: Enable charging or resume charging

 

When both CAN and the digital control signals are available the charger is controlled by the CAN communication signal.

 

Anderson SB50 Connector for output. These connectors are labeled “+” and “-“. A mating connector comes with the charger.

 

CAN and Digital Input Controls A five wire connector connects to the charger for interfacing with the BMS. Three wires have a white connector attached, these three wires are the CAN interface. The other two wires are labeled “+ 12V” and “- 12V”, these wires are the digital input used to control the charger from the BMS CPU. Connect the “+ 12V” to the OV connection on the BMS CPU and the “- 12V” to the GND connection on the BMS CPU.

 

The BMS CPU will output a 12 volt signal from the “OV” terminal whenever a pack normal situation is detected. During charging if a cell exceeds the maximum voltage limit this will drop to 0 volts which will trigger the charger to temporarily pause charging until the high voltage cell can return to a normal voltage. All green LED’s on the charger will flash when this occurs.

 

For a CAN communication connection, connect the CANH, CANL and CAN GND to the matching BMS CAN connections.

 

If both the CAN communication and the digital inputs are connected CAN communications will take priority over the digital input for charge control. CAN communications requires the optional CAN board be installed on the BMS CPU.

 

Cautoions:

• If your BMS has a programming port on it marked “Rx, Tx, RES, VSS”. Do not connect the CAN communication connection to this port, or damage may occur.

• Make sure charger voltage output matches is appropriate for your battery pack finish charge voltage..

• After a complete charge, disconnect the AC from the charger and then disconnect the charger from the battery pack.

• A properly installed BMS system must be used during the charging process (either through CAN communication or through the digital alarm input) to prevent over-charging.

 

 

Troubleshooting:

• The charger must be installed in a cool well-ventilated area which is free of dust

• If the charger is not charging, unplug the charger from the AC line and battery pack, then check for poor connections, short circuits, over heating conditions as well as alarm status from the Energy Management System.

• If charger does not display any LED’s when plugged in and charging does not occur the fuse may be blow. Unplug the charger from the battery pack and AC line and check the fuse by unscrewing the cap with a #2 Philips screw driver. If the fuse is blown replace with an equivalent size fuse of the same voltage and amperage rating.

• If the charger finishes charging too early make sure that the connection from the charger to the battery pack is good, and does not have high resistance.