Operating Status; Fault Finding The Product - Grundfos ALPHA2 Series Installation And Operating Instructions Manual

13.8 Operating status

The LEDs indicate the actual operating status or alarm status.
This circulator pump is either for internal control with
constant-curve control or external PWM-signal control with profile
C. See fig. 47.
Fig. 47 Operating mode
PWM can only operate if you have set the pump to PWM mode.
Press the button five times until only the green LED is on. When
you connect the PWM cable, the yellow LEDs are on and you can
control the pump via the PWM signal. See fig. 47.

13.9 Fault finding the product

The alarm status is indicated by the LEDs.
Fault
ON
230 V
ON
<160 V
ON
230 V
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 valve on either side of the
pump. The pumped liquid may be scalding hot
and under high pressure.
32
CONSTANT CURVE 1
CONSTANT CURVE 2
CONSTANT CURVE 3
CONSTANT CURVE 4
PWM C PROFILE SOLAR
PWM C PROFILE SOLAR
4.5 m 6.5 m
5.5 m 8.5 m
6.5 m 10.5 m
7.5 m 14.5 m
7.5 m 14.5 m
5 mm
No.2
Description
The rotor is blocked. Deblock
the rotor.
The supply voltage is low. Make
sure that there is sufficient
voltage supply to the pump.
Electrical error. Replace the
pump and send the pump to the
nearest Grundfos service
centre.