Digital Inputs - Grundfos CRE Montage- Und Betriebsanleitung

9.3.4 Signal relay
Pumps of 0.37 - 7.5 kW have one signal relay. The factory setting
of the relay will be Fault.
Pumps of 11-22 kW 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.
0.37 - 7.5 kW
• Ready
• Fault
• Operation
• Pump running (only three-phase pumps, 0.55 - 7.5 kW)
• Warning (only three-phase pumps, 0.55 - 7.5 kW).
11-22 kW
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
Fault and Alarm cover faults resulting in Alarm.
Warning covers faults resulting in Warning.
Note Relubricate covers only that one individual event. For
distinction between alarm and warning, see section
9.1.3 Fault indications.
For further information, see section
relay.
9.3.5 Buttons on pump
The operating buttons and
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.
20
11-22 kW
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
16. Indicator lights and signal
on the control panel can be set
9.3.6 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.

9.3.7 Digital inputs

The digital inputs of the pump (terminal 1, fig. 5,
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 figures 5,
See also section 12.2 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 section
function.
Dry running (only three-phase pumps):
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.
4 or 10) can be
4 and 10.
9.3.8 Stop