27
English (US)
19.3.4 Signal relay
Pumps of 3-10 hp have one signal relay. The factory setting of the
relay will be Fault.
Pumps of 15-30 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.
For further information, see section
26. Indicator lights and signal
relay
on page
37
.
19.3.5 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.
19.3.6 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.
19.3.7 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 section
22.2 Digital input
on page
36
.
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
19.3.8 Stop
function
on page
28
.
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.
3-10 hp
• Ready
• Fault
• Operation
• Pump running (only three-phase pumps, 3-10 hp)
• Warning (only three-phase pumps, 3-10 hp).
15-30 hp
15-30 hp
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
• Ready
• Alarm
• Operation
• Pump running
• Warning
• Relubricate.
1RWH
1RWH
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
section
19.1.3 Fault indications
on page
23
.
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