Pierburg CWA400 PWM Brushless Water Pump 40mm OD - 12v

Pierburg CWA400 PWM Brushless Water Pump 40mm OD - 12v

The Pierburg Electrical CWA coolant pumps make a significant contribution to emission control on modern engine designs. A delivery rate that is not dependent on the speed of another drive enables demand-based cooling. This reduces the power requirements whilst also cutting down on frictional loss, fuel consumption and pollutant emissions.

Electrical CWA coolant pumps offer top performance. They can be used for the main cooling of the combustion engine, as well as for cooling the fuel cell stacks of fuel cell drives.

Pierburg has made the electrical water pump ready for series production and was the world’s first series-production supplier for a leading premium vehicle manufacturer.

• Compact radial auxiliary coolant pump.
• Speed control and extended diagnostics information via PWM or LIN bus.
• Efficiency close to 40% at the nominal operating point.
• Demand-based cooling.
• High flow rate at a low pressure.
• Homogeneous heat dissipation.
• Optimised for high-temperature applications and more demanding service life requirements.
• Improved resistance to influences that impair EMC.

Connector Part Numbers

Plug, terminals and seals sold separately

Please ensure your supply is fused appropriately.

PWM Input Frequency

The frequency of the PWM/Emergency run signal should be set at 680 Hz.

Note: To assure that the pump awakes under PWM/Emergency Run control, an uninterrupted high pulse of at least 3ms musts be applied to the PWM/Emergency run input.

For Example: This is automatically achieved at a PWM/Emergency run frequency of 150 Hz and a duty cycle of 50% or above.

PWN/Emergency Input Level

Duty Cycle vs Speed

Duty Cycle

The percentage duty cycle is represented by the relationship of T_high to T_Period.

Duty cycle is PWM.

Duty Cycle % = T_high / (T_low + T_high).

Please Note: Drawing depicts protective caps that must be removed before installation

ATTENTION

• The pump can be installed in either a horizontal or vertical position. To avoid air-locks when mounted horizontally, the outlet should be turned in such a way that it is directed upwards or is placed on the upper side of the pump body.