Orion jr (48V) Wiring Manual docx
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- Bu səhifədəki naviqasiya:
- Wiring CAN interfaces
- The bus
- Charge Enable Output (pin 1)
Orion Jr. BMS Manual – Rev. 2
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LED Status Light The LED light on the BMS unit indicates its status: A green light indicates that the unit is powered and that there are no errors present. A red light indicates that the unit is powered, but errors are present. If the light is not lit, the unit is not receiving power or has entered into a low power shutdown. If a unit has firmware revision 2.0.1 or newer (only available for rev C), a rapidly blinking red light indicates that the unit is detecting a voltage greater than 5v on one of the cell taps, which may be damaging the unit. Immediately disconnect the unit if the light begins rapidly blinking red. Note: the absence of the rapid red LED does not indicated wiring is necessarily correct!
This option is only available if the BMS unit is ordered with a CANBUS interface. The CANBUS interfaces can be configured to run at 125, 250, 500 or 1000 Kbps. CAN interfaces are differential mode buses and require twisted pair wire (2 wires) to communicate. For best operation, shielded twisted pair wire should be used for protection against electrical noise immunity, particularly when used in noisy environments. Shields should only be connected in one location to prevent ground loops. While it is necessary for the twisted pair CAN wires to be outside of the shield for a short distance at any connectors, the amount of non shielded, non-twisted wire should be kept as short as possible, ideally less than 2-3 inches, especially in high noise environments.
Controller Area Networks (CAN) require exactly two 120 ohm termination resistors on the two physical ends of the bus to operate properly. Unless specifically ordered without, the Orion Jr. BMS contains one 120 ohm termination resistor inside the unit. A CANBUS can have many nodes attached to a single bus. If only two nodes are attached, they should be at the physical ends of the cable with a termination resistor as close to each end as possible. If additional nodes are used, they should “T” off the main wire. While the entire CANBUS cable can be very long (up to 30 meters for 1mpbs, 100 meters for 500kbps, or 500 meters for 125kbps), the taps off the main wire for additional nodes should be kept less than about 3.5 feet or 1 meter off the main cable. If improperly wired (i.e. only one termination resistor on the bus or long taps off the main cable), the bus sometimes may appear to work, but may then fail or suffer reliability problems at a later time when exposed to more significant noise. The bus must be properly terminated even if it appears to work with just one termination resistor!
After wiring the CAN interfaces, verify proper termination by using an ohm-meter to check the resistance between CAN_H and CAN_L. In order to verify the resistance, all power must be removed from all devices on the CANBUS. The total resistance should measure 60 ohms (two 120 ohm resistors in parallel = 60 ohms.) Orion Jr. BMS Manual – Rev. 2
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Wiring digital signal outputs The Orion Jr. has either 5 (revisions A & B) or 6 (revision C) signal level digital I/O outputs - Charge Enable, Discharge Enable, Charger Safety, Multi Purpose Enable, Multi Purpose Output 1, and Multi Purpose Output 2 (revision C only). These outputs are open drain outputs which means that they do not source any current or voltage, but rather pull down to ground and sink current when they are turned on. While this may seem like an odd way to interface with the BMS, this method provides greater flexibility and can interface with a wide range of applications using different voltages up to 24V nominal / 30V
outputs pull low when they are “on” and cannot be inverted in software for safety reasons. This is done so that if the BMS connecter were to become disconnected, the outputs would fail “ off ” rather than “ on
. For safety reasons, the Charge Enable, Discharge Enable, Charger Safety and Multi Purpose Enable outputs feature an analog watchdog circuit which turns these four outputs off in the event of a processor malfunction, adding an extra layer of safety. The Multi Purpose Outputs 1 and 2 do not have the watchdog feature as it is not designed to control charge or discharge current.
Important: An external fuse rated 3A or less rated for at least the full DC working voltage with a suitable interrupting current rating must be installed at the voltage source to protect the wiring to any open drain output or relay controlled by the BMS. Fuses must have a voltage rating that exceeds the maximum possible working voltage and must be rated with a sufficient interrupting current rating.
Please note that the output of an open drain cannot be directly measured with a multimeter as they do not source voltage. Please see below for more information on testing the outputs.
turned on (pulled low) as soon as the BMS has gone through self checks and determined that the battery is able to be charged. This output will turn off (float high) if the BMS determines that the battery can no longer accept a charge or if the maximum charge amperage is exceeded. This output can be turned back on again automatically when certain criteria set in the software are met. If the BMS turns this output off (and if the charger safety output is also off), but still measures current flowing into the battery pack afterwards, a critical error will be set on the BMS resulting in the disabling of all charge and discharge until the BMS has been reset as a safety feature. Please see the software manual for more details on how the BMS determines when this pin is on or off.
Important: In addition to using this output, any charge source should be set such that it will shut off in the event the maximum pack voltage is reached as a secondary precaution against overcharge. While
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