Hitachi RAS-25QH1 Technische Information Seite 187

12. Outdoor DC Fan Motor Control Circuit
MAIN P.W.B. FAN P.W.B. ,
teers
DC fan motor
5V
Microcomputer
AX-8H20
Chopper
circuit
Triangular signal
generator circuit
Current
limiter circuit
o 9 © 6 O}—
Duty 5 Overcurrent
comman 5 i cei
circuit limiter circuit
4-bit Position ; di
@ micro computer sb ar Ne Filter circuit] i
CNG c:r). | "Beeneetenetrepeereearetssce-terhe ue sees
i
| PP ae a mR aE Te CO PE i =P NE I A Nea i}
Fig. 12-1
@ The outdoor DC fan motor receives ©: supply voltage (380V DC), @: control voltages (12V, 5V, —5V)
and 3): rotation speed command (0—5V) from the Control (MAIN) P.W.B. and controls the rotation speed
using the inverter control in the control circuit on the Fan motor contro! P.W.B. (Fig. 12-1)
@ Fig. 12-2 shows the relationship between
the command voltage and rotation speed. ae
Rotation speed (min)
Command voltage
)
[ee [on ae
Fig. 12-3
@ Fig. 12-3 shows the RAM-80QH1
command voltages.
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