Digital Inputs/Outputs; Signal Relays 1 And 2 ("Relay Outputs") - Grundfos Hydro Multi-E Series Installation And Operating Instructions Manual

13.4 Digital inputs/outputs

You can select if the interface is to be used as input or output.
The output is an open collector and you can connect it to, for
example, an external relay or controller, such as a PLC.
+ 24V
DO 3/4
Fig. 42 Example of configurable digital inputs/outputs
To set a digital input/output, make the settings below.
Mode
You can set the digital input/output 3 and 4 to act as digital input
or digital output:
• "Digital input"
• "Digital output".
Function
You can set the digital input/output 3 and 4 to the functions stated
in the table below.
Note: For "Function if input", see section 19. Digital input, while
for "Function if output" see section 13.5 Signal relays 1 and 2
(Relay outputs).
Possible functions, digital input/output 3
"Function if input"
• Not active"
• "External stop"
• "Min."
• "Max."
• "User-defined speed"
• "External fault"
• "Alarm resetting"
• "Dry running"
• "Accumulated flow"
• Predefined setpoint digit 2"
Possible functions, digital input/output 4
"Function if input"
• "Not active"
• "External stop"
• "Min."
• "Max."
• "User-defined speed"
• "External fault"
• "Alarm resetting"
• "Dry running"
• "Accumulated flow"
• Predefined setpoint digit 3"
Activation delay (only for input)
Select the activation delay (T1) which
is the time between the digital signal and the activation of the
selected function.
Range: 0 to 6000 seconds.
External
controller
"Function if output"
• "Not active"
• "Ready"
• "Alarm"
• "Operation"
• "Pump running"
• "Warning"
• Limit 1 exceeded
• Limit 2 exceeded
"Function if output"
• "Not active"
• "Ready"
• "Alarm"
• "Operation"
• "Pump running"
• "Warning"
• Limit 1 exceeded
• Limit 2 exceeded
Duration timer mode (only for input)
Select the duration timer mode. See fig. 41.
• "Not active"
• "Mode A" - active with interrupt
• "Mode B" - active without interrupt
• "Mode C" - active with after-run.
Select the duration time (T2) which is the time that, together with
the mode, determines how long the selected function is active.
Range: 0 to 15,000 seconds.
T input > T1 + T2
T input > T1 + T2
Digital input
T input
T input
Mode A
T1 T2
Mode B
T1 T2
Mode C
T1
Fig. 43 Duration timer function of digital inputs
Factory setting
See section 29. Factory settings.

13.5 Signal relays 1 and 2 ("Relay outputs")

The pump incorporates two signal relays for potential-free
signalling. For further information, see section
Function
You can configure the signal relays to be activated by one of the
following incidents:
• "Not active"
• "Ready"
The pump can be running or is ready to run and no alarms are
present.
• "Alarm"
There is an active alarm and the pump is stopped.
• "Operating" ("Operation")
"Operating" equals "Running" but the pump is still in operation
when the pump stops due to low flow. See section
detection" on page 19.
• "Running" (Pump running)
The pump is running.
• "Warning"
There is an active warning.
• "Limit 1 exceeded"
When this function is activated, the signal relay is activated.
See section 12.8 Limit-exceeded
• "Limit 2 exceeded"
When this function is activated, the signal relay is activated.
See section 12.8 Limit-exceeded
• "External fan control" ("Control of external fan")
When you select "External fan control", the relay is activated if
the internal temperature of the motor electronics reaches a
preset limit value.
Factory setting
See section 29. Factory settings.
T input < T1 + T2
T input < T1 + T2
T input
T input
T1
T1 T2
T2 T1 T2
18. Signal relays.
"Low-flow
function.
function.
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