Installation And Electrical Connection - Wilo Yonos PICO-STG Instrucciones De Instalación Y Funcionamiento

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PWM 1 mode – geothermal
In PWM 1 mode – geothermal, the pump speed is controlled
depending on the PWM input signal (Fig. 3c).
Behaviour in the event of a cable break:
If the signal cable is separated from the pump, e.g. due to
a cable break, the pump accelerates to maximum speed.
PWM 2 mode – solar
In PWM 2 mode – solar, the pump speed is controlled depend-
ing on the PWM input signal (Fig. 3d).
Behaviour in the event of a cable break:
If the signal cable is separated from the pump, e.g. due to
a cable break, the pump stops.
External control via a PWM signal
The required setpoint/actual value comparison for controlling is
performed by an external controller. A PWM signal is supplied as
a correcting variable to the pump from the external controller.
The PWM signal generator gives the pump a periodic
sequence of impulses (the duty cycle) in accordance with DIN
IEC 60469-1. The correcting variable is determined by the ratio
of the impulse duration to the impulse period duration. The
duty cycle is specified as a dimensionless ratio with a value
of 0 ... 1 or 0 ... 100%. PWM signal logic 1 (geothermal) Fig. 3c
and PWM signal logic 2 (solar) Fig. 3d.

7 Installation and electrical connection

DANGER! Risk of fatal injury!
Incorrect installation and improper electrical connections
can be life-threatening.
• The installation and electrical connection may only be carried
out by qualified personnel in accordance with the applicable
regulations!
• Adhere to regulations for accident prevention!
28 WILO SE 12/2018