Wilo Stratos MAXO Serie Instrucciones De Instalación Y Funcionamiento página 145

6.6 Digital input (DI1) or (DI2) – grey
terminal block
Installation and operating instructions Wilo-Stratos MAXO/-D/-Z
Electrical connection
▪ Load resistance at 0 – 10 V, 2 – 10 V: ≥ 10 kΩ
▪ Dielectric strength: 30 V DC / 24 V AC
▪ Terminal for supplying active sensors with 24 V DC – maximum power load: 50 mA
NOTICE
See section 10.5 "Application and function of analogue inputs AI1 and AI2
[} 183]"
CAUTION
Overload or short-circuit
In case of overload or short-circuit of the 24 V connection, all input functions will fail
(analogue inputs and digital inputs).
The input functions will be available again when the overload or short-circuit situ-
ation is resolved.
CAUTION
Overvoltages destroy the electronics
Analogue and digital inputs are protected for overvoltages up to 30 V DC / 24 V AC.
Higher overvoltages destroy the electronics.
Fig. 34: Digital In
The pump can be controlled with the following functions via external potential-free
contacts (relay or switch) at the DI 1 or DI 2 digital inputs:
Function control input DI 1 or DI 2
External OFF
• External MAX
• External MIN
• External MANUAL
• External key lock
Heating/cooling switchover
Table 14: Function control input DI 1 or DI 2
Technical data:
Contact open: Pump switched off.
Contact closed: Pump is switched on.
Contact open: Pump is running in the mode set on
the pump.
Contact closed: Pump is running with maximum
speed.
Contact open: Pump is running in the mode set on
the pump.
Contact closed: Pump is running with minimum
speed.
Contact open: Pump is running in the mode set
on the pump or in mode requested via bus com-
munication.
Contact closed: Pump is set to MANUAL.
Contact open: Key lock is deactivated.
Contact closed: Key lock is activated.
Contact open: "Heating" active.
Contact closed: "Cooling" active.
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