Cellwatch Frontier System Installation & User Manual
Section I – Installation Guide-42
Considerations for low voltage jars
The operational voltage of the DCM must be considered when monitoring a string. The DCM must be
wired so that at least 4.5V (DCM5) or 4V (DCM6) is supplied between the power leads (brown and
white). If the cells monitored cannot supply enough voltage to power the DCM, then the DCM must be
wired across more cells than typically connected. When wired this way, each channel in Frontier will
measure across two jars. This will affect ohmic and voltage readings but will still allow the user to
monitor the health of their battery.
Connecting the DCM5 across 2 NiCd jars per channel ensures that if one or more jars drops below its recommended charging
voltage, the DCM will continue to operate.
The DCM6-L allows the system to monitor each cell. The DCM6-L can operate at voltages as low as 4V
so it can be wired across as few as three NiCd cells. Normal wiring would have a single DCM6-L
monitoring across four cells.
DCM6-L wiring for NiCd jars
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