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Collective fault signal SSM
Faults always result in the activation of the collective fault signal "SSM" via a relay. The contact of the col-
lective fault signal (potential-free normally closed contact) can be connected to the system for the purpose
of registering any error messages that may occur.
The internal contact is closed if the pump is without power, if there is no fault or if there is a malfunction of
the control module.
The internal contact is open if the pump detects a fault.
The detailed behaviour of the SSM function is described in the section "Faults, causes and remedies".
LIN Extended
The pump has an LIN bus interface as specified in VDMA 24226, with the addition of Wilo exclusive features.
It allows a bidirectional communication between the pump and the controller.
The pump can be controlled by LIN with the following setpoints:
•
Speed constant
•
Δp-v
•
Δp-c
The pump provides the following information:
•
Volume flow (Q)
•
Delivery head (H)
•
Power consumption (P)
•
Current speed (n)
•
Energy consumption (E)
•
Current operating mode
•
Pump status
•
Error information (see section "Faults, causes and remedies")
Behaviour when a cable breaks: If the signal cable is disconnected from the pump, e.g. due to a cable break,
the pump activates an alternative fallback mode, which can be configured via LIN.
To find out more about the LIN Extended Bus interface, please contact the Wilo technical support.
Modbus
The pump has a Modbus RTU interface. It corresponds to the MODBUS APPLICATION PROTOCOL SPECIFICA-
TION V1.1 and MODBUS SERIAL LINE PROTOCOL V 1.02 in RTU transmission mode, available at www.mod-
bus.org.
The pump can be controlled by the Modbus interface with the following setpoints:
•
Speed constant
•
Δp-v
•
Δp-c
The pump provides the following information:
•
Volume flow (Q)
•
Delivery head (H)
•
Power consumption (P)
•
Current speed (n)
•
Energy consumption (E)
•
Current operating mode
•
Pump status
•
Error information (see section "Faults, causes and remedies")
Behaviour when a cable breaks: If the signal cable is disconnected from the pump, e.g. due to a cable break,
the pump activates an alternative fallback mode, which can be configured via Modbus.
The pump receives the following parameters by default:
Installation and operating instructions • Wilo-Para MAXO/-G/-R/-Z • Ed.04/2024-11
en
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