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Installation and operating instructions Wilo-Stratos MAXO/-D/-Z 41
2. Remove the module cover.
➜Fig.22
▪Follow the detailed instructions online for further steps!
➜See QR code or www.wilo.com/stratos-maxo/om
6.4 Analogue input (AI1) or (AI2) - purple terminal block
➜Fig.23
Analogue input for following signals:
▪0–10V
▪2–10V
▪0–20mA
▪4–20mA
▪PT1000
Dielectric strength: 30VDC/24VAC
The analogue inputs can be used for the following functions:
▪External setpoint specification
▪Sensor connection: temperature sensor, differential pressure
sensor, PID sensor
▪Terminal for supplying active sensors with 24VDC
– Maximum current load: 50mA
▪Analogue input load (0) 4–20mA: ≤300Ω
– Load resistance at 0–10V: ≥10kΩ
6.5 Digital input (DI1) or (DI2) - grey terminal block
➜Fig.23
Digital input for potential-free contacts:
▪Maximum voltage: <30VDC/24VAC
▪Maximum loop current: <5mA
▪Operating voltage: 24VDC
▪Operating loop current: 2mA (per input)
The pump can be controlled with the following functions via ex-
ternal potential-free contacts at the DI1 or DI2 digital inputs:
▪External OFF
▪External MAX
▪External MIN
▪external MANUAL
▪External key lock
▪Heating/cooling switchover
In systems with a high switching frequency (>100 on/off opera-
tions per day); switching on/off takes place via “External OFF”.
6.6 Wilo Net – green terminal block
Wilo Net is a Wilo system bus used for establishing communication
between Wilo products:
▪Two single pumps as twin-head pump function
▪Several pumps used with Multi-Flow Adaptation control mode
▪Gateway and pump
Follow the detailed instructions online for connection.
➜See QR code or www.wilo.com/stratos-maxo/om
6.7 Collective fault signal (SSM) – red terminal block
➜Fig.23
An integrated collective fault signal is applied at the SSM terminals
as a potential-free changeover contact.
Contact load:
▪Permitted minimum: SELV 12VAC/DC, 10mA
▪Permitted maximum: 250VAC, 1A, AC1 / 30VDC, 1A
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