Grundfos ALPHA SOLAR Manual page 11

INTERNALLY
5a
CONTROLLED
CONSTANT CURVE
1 × 230 V +10/-15%
∽ 50/60 Hz
20
L
PE
N
EXTERNALLY
5b
CONTROLLED
PWM C PROFILE
SOLAR
1 × 230 V +10/-15%
∽ 50/60 Hz
IN
REF
OUT
L
PE
N
PWM
SYSTEM
CONTROLLER
21