How do I connect an external PWM control signal to the UPS3?

Make sure the pump is turned off, then locate the PWM signal connection on the pump and connect the signal cable using a mini superseal plug — the cable has three conductors: signal input (brown), signal reference (blue), and signal output (black). Switch on the power supply and the pump will automatically detect if a valid PWM signal is available and enable the external control mode. Note that the signal cable must not exceed 3 metres in length and is not supplied with the pump. (Page 15)