GWL Cell Performance Monitor
The Cell Performance Monitor (GWL CPM) is an easy-to-use and effective solution for the protection of the LiFePO4 and LTO batteries from excessive discharge or overcharge.
The key features
- When exceeding the user-adjustable minimum or maximum of any cell, CPM module closes or opens the output contacts for the relay coils.
- It brings the lowest and highest cell voltages of the cells in pack to separate outputs (for monitoring measurements or for connection of the LED display or the communication module).
- The multi-colour LEDs indicate the highest and lowest voltage cells and the operating status of the module.
- It has very low power consumption and a built-in function of battery emergency disconnection from the powered system, including self-disconnection and shutdown.
- It is part of the GWL/Modular series, i.e., it is an open-source solution that is and will be compatible with the related GWL products and with other commonly available components.
- The quality of the design, versatility and technical support options make it suitable for industrial applications and sophisticated home installation solutions.
- For a battery with 4 to 16 LiFePO4 or 5 to 16 LTO cells (any number in this range).
- To control a bi-stable (dual coil) relay with a coil of full battery control voltage (or lower) by a pulse of 150 ms. One bi-stable relay can disconnect the charger, the second load, and the third (emergency) is a back-up in case the main relays fail to open.
- For controlling conventional single-coil NO/NC relays with a coil’s voltage of full battery voltage. Two can be used to disconnect and connect the charger, load, or as an information to a additional system, such as a charger, converter or communications module. The third relay is back-up (emergency).
- For various display and communications modules, such as a digital voltmeter, Arduino and Raspberry microcomputers, LAN Controller by Tinycontrol, Siemens LOGO PLCs, Schneider Zelio PLC module, Eaton Easy PLC, TECO Foxtrott PLC, etc.
- For many other modules and devices which CPM can forward the necessary voltage information. Additional custom functions and algorithms can be programmed.
Description of the main part of the board
- INPUTS - inputs terminal for connecting 16 pcs battery cells
- BUTTONS - press more then 2 second for ON or OFF
- SIGNAL LEDS - signal leds show which cell has nimumum and maximum voltage
- VOLTAGE SELECTORS - with this trimmers it is possible to set Umax and Umin
- OUTPUTS - using outputs terminals it is possible to control other devices and power relays.
Basic connection of inputs and outputs
- BATTERY – Connect the battery to GND and CELLS inputs 1–16.
GND is always negative (-) of the entire battery. Connect the positive (+) poles of each battery cell to
inputs 1–16 in the electrical order from GND as they are connected in series.
- Ucells – Connect digital voltmeters (not analogue with pointers), bargraphs, or use for communication
with a connected device. Use only the high impedance load and follow the principles of safe connection
to the connected systems described in the ‘Installation procedure and safe wiring principles’ section.
- Umin – Use to open the load relay or for optical and sound indication of low battery cell voltage or to
communicate with the connected system.
- Umax – Use to open the charger relay or for optical and sound indication of high battery cell voltage or
to communicate with the connected system.
- Emergency 1, 2, 3 – Use for emergency battery disconnection.
- Emergency 4–9 – Use to control the module by pulse switching (> 300ms, start, stop, reset). If inputs
4 + 5 are permanently connected, the module does not respond to commands via outputs 6, 7 and 8, 9.
More examples of possible connection you can find in the
CPM installation examples
Example of installation in wallbox
Example of installation in server rack
|Power supply (V)
GWL Cell Performance Monitor
The Cell Performance Monitor (GWL CPM) is an easy-to-use and effective...