The input for external setpoint signal can be set to different signal
types.
Select one of the following types:
• 0-10 V
• 0-20 mA
• 4-20 mA
• Not active.
If Not active is selected, the setpoint set by means of the R100 or
on the control panel will apply.
If one of the signal types is selected, the actual setpoint is
influenced by the signal connected to the external setpoint input.
See the section on external setpoint signal.
Related information
5.8 External setpoint signal
5.4.4 Signal relay
Pumps of 20-30 hp have two signal relays. Signal relay 1 is factory
set to Alarm and signal relay 2 to Warning.
In one of the displays below, select in which one of three or six
operating situations the signal relay should be activated.
20-30 hp 20-30 hp
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
Fault and Alarm cover faults resulting in Alarm. Warning
covers faults resulting in Warning. Relubricate covers only
that one individual event. For distinction between alarm
and warning, see the section on fault indications.
For further information, see the section on indicator lights and signal
relay.
Related information
5.2.3 Fault indications
5.11 Indicator lights and signal relay
5.4.5
Buttons on pump
The operating buttons and on the control panel can be set to
these values:
• Active
• Not active.
When set to Not active (locked), the buttons do not function. Set the
buttons to Not active if the pump should be controlled via an
external control system.
5.4.6
Pump number
A number between 1 and 64 can be allocated to the pump. In the
case of bus communication, a number must be allocated to each
pump.
5.4.7 Digital inputs
The digital inputs of the pump can be set to different functions.
Select one of the following functions:
• Min. (min. curve)
• Max. (max. curve)
• External fault
• Flow switch
• Dry running (from external sensor) (only three-phase pumps).
The selected function is activated by closing the contact between
terminals 1 and 9, 1 and 10 or 1 and 11.
See also the section on digital input.
Min.:
When the input is activated, the pump will operate according to the
min. curve.
Max.:
When the input is activated, the pump will operate according to the
max. curve.
External fault:
When the input is activated, a timer will be started. If the input is
activated for more than 5 seconds, the pump will be stopped and a
fault will be indicated. If the input is deactivated for more than 5
seconds, the fault condition will cease and the pump can only be
restarted manually by resetting the fault indication.
Flow switch:
When this function is selected, the pump will be stopped when a
connected flow switch detects low flow.
It is only possible to use this function if the pump is connected to a
pressure sensor.
If the input is activated for more than 5 seconds, the stop function
incorporated in the pump will take over. See the section on stop
function.
Dry running
When this function is selected, lack of inlet pressure or water
shortage can be detected. This requires the use of an accessory,
such as these:
• a Grundfos Liqtec
®
dry-running sensor
• a pressure switch installed on the suction side of a pump
• a float switch installed on the suction side of a pump.
When lack of inlet pressure or water shortage (Dry running) is
detected, the pump will be stopped. The pump cannot restart as
long as the input is activated.
Related information
5.4.8 Stop function
5.7 Digital input
17
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