Toshiba RAS-M10GDV-E Service Manual page 14

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4. Contents of operation command signal (Serial
signal) from outdoor unit controller to indoor unit
controller
The following signals are sent from the outdoor
unit controller.
• The current operation mode
• The current compressor revolution
• Outdoor temperature
• Existence of protective circuit operation.
For transferring of these signals, the indoor unit
controller monitors the contents of signals, and
judges existence of trouble occurrence.
Contents of judgment are described below.
• Whether distinction of the current operation
status coincide with the operation command
signal
• Whether protective circuit operates
When no signal is received from the outdoor
unit controller, it is assumed as a trouble.
8-1-1. Capacity Control
The cooling capacity is varied by changing compres-
sor motor speed. The inverter changes compressor
motor speed by changing AC 220 – 240V power to
DC once, and controls capacity by changing supply
power status to the compressor with transistor
module (includes 6 transistors). The outline of the
control is as follows : The revolution position and
revolution speed of the motor are detected by detect-
ing winding electromotive force of the compressor
motor under operation, and the revolution speed is
changed so that the motor drives based upon revolu-
tion speed of the operation command by changing
timing (current transfer timing) to exchange inverter
output voltage and the power supply to the winding.
Detection of the revolution position for controlling is
performed 12 times per 1 revolution of compressor.
The range of supply power frequency to the com-
pressor differs according to the operation status.
Operation mode Fan mode
COOL
HEAT
Table 8-1-1 Reference fan speed
M10
H 900 to 1150
L 600 to 800
H 900 to 1150
L 650 to 850
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8-1-2. Current Release Control
The outdoor main circuit control section (Inverter
assembly) detects the input current to the outdoor
unit. If the current value with compressor motor
speed instructed from indoor side exceeds the
specified value, the outdoor main circuit control
section controls compressor motor speed by reduc-
ing motor speed so that value becomes closest to
the command within the limited value.
8-1-3. Indoor Fan Control (AC Fan Motor)
The indoor fan is operated by motor speed non-step
variable AC phase control drive system. For airflow
rate, motor speed is controlled manually in five steps
(LOW, LOW + , MED, MED
adjusted in AUTO mode according to the room
temperature. It is not selected by relay, so the
switching noise will not be heard.
Table 8-1-1 shows the fan speed.
This indoor unit performs the phase output
constant control of the fan motor.
(Does not control the revolution speed.)
Since the fan speed varies according to the external
static pressure, the values described in the table can
be used to confirm the motor functions. However, the
maximum revolution speed is limited to 1300rpm for
protection of the terminal voltage of the running
capacitor.
Fan speed (rpm)
M13
950 to 1200
650 to 850
950 to 1200
700 to 900
– 14 –
+ , HIGH), or automatically
M16
1000 to 1250
700 to 900
1000 to 1250
750 to 950