CPAL2/7.5 SD

Operating Principle

• Drainage / sump pump stations: Two common floats define the MIN and MAX water levels, while an individual auxiliary float is assigned to each pump. When the level rises above MIN, the panel starts the next pump in the duty-rotation sequence to balance runtime hours. Additional pumps start one-by-one as higher floats are triggered. Depending on the selected mode, pumps either all stop together at MIN (Emergency Mode 1) or stop sequentially as each lower float is reached (Standard Mode 2). Dry-run protection blocks operation below MIN, and any pump that trips is instantly replaced by the standby unit.

Product Features and Benefits

• Hand-0-Auto selector switch for each pump

• Isolation transformer and phase-failure relay for stable, protected power supply

• Remote start/stop via external dry contact

• Automatic pump change-over for duty rotation

• Automatic standby takeover in case of pump fault

• Dry-run interlock using level floats

• Individual fault lamp and run lamp for every pump

• Individual fault and run relay outputs for BMS integration

• Adjustable start/stop delays to prevent short cycling

• Direct-on-line (DOL) or optional star–delta motor starting

• IP54 powder-coated steel enclosure for harsh underground environments

Control and Signal Functions

• External dry-contact Run / Stop command

• SSM common fault relay (normally closed)

• SBM common run relay (normally open)

• Separate fault relay per pump

• Separate run relay per pump