Hitachi RAM-60QH4 Manuel De Service page 82

B
DC current (Id)
detection resistor
Since current flows at point
●
becomes intermittent waveform as shown in Fig. 3-3. Since current at point
input current of the air conditioner, input current is controlled by using DC current (Id) detection resistor.
<Reference>
If power module is detective, self diagnosis lamps on the control P.W.B. may indicate as shown below:
SMOOTHING
CAPACITOR
SWITCHING POWER P.W.B.
REACTOR
SELF-DIAGNOSIS LAMPS
CONTROL P.W.B.
※From results of power module simple inspection (inspection mode when operated with compressor lead
disconnected), LD310 blinks four times about 2 seconds later: Unit has not entered the normal operation.
System Power module
300-330V
＋
＋
U
−
U
−
Fig. 3-4 System Power module circuit (U + is OFF, V - is ON)
only when U + transistor and V - transistor is ON, the current waveform at point
SPM（SYSTEM POWER MODULE）
DIODE STACK
SERVICE SWITCH
Fig. 3-5
＋
＋ W
V
− −
V W
Table 3-1
2P TERMINAL BOARD
Ip (peak current cut)
Abnormal low speed
Switching incomplete
2P TERMINAL BOARD
(2 pcs.)
– 94 –
A U coil
U
V
W
V coil
is approximately proportional to the
Self-diagnosis lamp
Self-diagnosis
and mode
LD301
LD301
rotation
LD301
DC compressor
motor
W coil
Blinks 2
times
Blinks 3
times
Blinks 4
times