Grundfos 509921, Instructions Manual

Page: 17 / 26

English (GB)
17
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.
22 .
When there is no active alarm anymore, the operating panel
switches back to operating status and the first LED switches from
red to green.
Fig. 22 Fault finding table
9.1 Deblocking the shaft
If the pump is blocked it is necessary to deblock the shaft. The
pump deblocking device is accessible from the front of the pump
without having to demount the control box. The force of the
device is high enough to deblock pumps, which are seized by
lime, for example if the pump has been turned off during summer.
Course of action:
1. Switch off the power supply.
2. Close the valves.
3. Locate the deblocking screw in the centre of the control box.
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 3, if necessary.
5. Switch on the power supply.
Fig. 23 Deblocking the shaft
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.
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
Hot surface
Minor or moderate personal injury
- The pump housing may be hot due to the pumped
liquid being scalding hot. Close the isolating valves
on both sides of the pump and wait for the pump
housing to cool down.
CAUTION
Pressurised system
Minor or moderate personal injury
- Before dismantling the pump, drain the system or
close the isolating valves on both sides of the
pump. The pumped liquid may be scalding hot
and under high pressure.
Display Status Solution
Alarm
The pump stops.
The pump is blocked.
Deblock the shaft. See
section
9.1 Deblocking the
shaft .
Alarm
The pump stops.
The supply voltage is
low.
Make sure that there is
sufficient voltage supply to
the pump.
Alarm
The pump stops.
Electrical error.
Replace the pump and
send the pump to the
nearest Grundfos Service
Center.
2
3
0/Off
1/On
1
No.2
5 mm
2
3 4
0/Off
1/On
1
T
M
0
7
1
41
4 0
6
1
9
2
3
0/Off
1/On
1
No.2
5 mm
Before, during and after the deblocking, the device is
tight and must not release any water.