– 46 –
Drive signal at point C
Drive signal at point D
Fig. 4-6
U
V
W
U
V
W
U
V
W
U
V
5V
0V
V
W
U
U
15V
0V
U
V
W
V
W
V
W
120
120
120
120
120
•
IPM drive circuit
The inverter driving device (IGBT) and the drive circuit are built in the IPM. The IPM receives the
signal from the microcomputer and convert it to 0 – 15 V signal to drive the IGBT.
When the unit operates at low speed, a chopper signal is emitted from the micro computer as shown
in Fig. 4-6. (0 to 5 V)
The signal is converted to 0 – 15 V at inside the IPM and transmitted to the gate of the transistor
(IGBT) in each phase to drive the IGBT.
When abnormal peak current was detected while the inverter is driving, the IPM outputs the Fail
signal immediately from the pin
S
and forces the lower arm transistor to shut off at the same time. In
this step, the Q501 is turned on and the input signal of the upper arm is also shut off through the
D501 and D502, so that all signals to the IGBT are shut off. This signal is also distributed to
microcomputer (pin
G
) as a Lo signal to stop the drive signal and blink the self diagnosis lamp as two
time.
When the peak current is detected, the IPM keeps the lower arm off for about 4mS and the drive
signal into stand-by state. 3 minutes after this state, the micro computer outputs the drive signal and
restarts the operation.
Summary of Contents for Summit RAC-35YH6
Page 17: ... 15 CONSTRUCTION AND DIMENSIONAL DIAGRAM MODEL RAS 35FH6 INDOOR UNIT ...
Page 22: ...RAS 35FH6 CIRCUIT DIAGRAM 20 08A392_05_RAS_35FH6_20 21_A2_E 2008 2 22 18 40 20 ...
Page 25: ... 23 button 25 26 26 27 28 26 RAS 35FH6 08A392_07_RAS_35FH6_23_A3_E 2008 3 7 10 07 23 ...
Page 92: ... 90 PARTS LIST AND DIAGRAM INDOOR UNIT MODEL RAS 35FH6 ...
