Fault Finding The Product; Deblocking The Shaft - Grundfos ALPHA1 L Instrucciones De Instalación Y Funcionamiento

9. Fault finding the product

If the pump has detected one or more alarms, the first LED
switches from green to red. When an alarm is active, the LEDs
indicate the alarm type as defined in fig. 19.
If multiple alarms are active at the same time, the
LEDs only show the error with the highest priority.
The priority is defined by the sequence of the table.
When there is no active alarm anymore, the control panel
switches back to operating status and the first LED switches from
red to green.
Alarm status Fault
ON
The pump is
blocked.
230 V
ON
Supply voltage
is low.
<160 V
ON
Electrical error.
230 V
Fig. 19 Fault finding table

9.1 Deblocking the shaft

If the pump is blocked it is necessary to deblock the shaft. The
ALPHA1 L deblocking device is accessible from the front of the
circulator without having to demount the control box. The force of
the device is high enough to deblock circulators, which are seized
by lime, e.g. if the pump has been turned off during summer.
Course of action:
1. Turn off the power supply.
2. Locate the deblocking screw in the centre of the control box.
3. Use a star screwdriver with a size 2 Phillips tip to push the
deblocking screw inwards.
4. When the screw can be turned counterclockwise, the shaft
has been deblocked. Repeat step 2, if necessary.
5. Turn on the power supply.
16
Display
Fig. 20 Deblocking the shaft
DANGER
Electric shock
Death or serious personal injury
- Switch off the power supply before starting any
work on the product. Make sure that the power
supply cannot be accidentally switched on.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on either side of the
pump. The pumped liquid may be scalding hot
and under high pressure.
Solution
Deblock the
shaft. See
section
9.1 Deblocking
the shaft.
Make sure that
there is sufficient
voltage supply to
the pump.
Replace the
pump and send
the pump to the
nearest
Grundfos
Service Center.
5 mm
Before, during and after the deblocking, the device is
tight and must not release any water.
5 mm
No.2
No.2