Toshiba RAV-SP454ATZ-E Pulse Motor Valve PMV control, Current release control, Requirement

<In case of RAV-SP40 and SP45 models>

1.Pulse Motor Valve (PMV) control

1)For PMV with 50 to 500 pulses during operation, respectively.

2)In cooling operation, PMV is controlled with the temperature difference between TS sensor and TC sensor.

3)In heating operation, PMV is controlled with the temperature difference between TS sensor and TE sensor.

4)For the temperature difference in items 2) and 3), 1 to 5K is aimed as the target in both cooling and heating operations.

5)When the cycle excessively rose in both cooling and heating operations, PMV is controlled by TD sensor. The aimed value is usually 106°C in both cooling and heating operations.

REQUIREMENT

A sensor trouble may cause a liquid back-flow or abnormal overheat resulting in excessive shortening of the compressor life. In a case of trouble on the compressor, be sure to check there is no error in the resistance value an the refrigerating cycle of each sensor after repair and then start the operation.

2. Discharge temperature release control

1) This function controls the operation

frequency, that is, lowers the operation

frequency when the discharge temperature

has not lower or the discharge temperature

has rapidly risen during PMV control.

It subdivides the frequency control up to a

unit of 0.6 Hz to stabilize the cycle.

TD [˚C]

Error stop

(“P03” display with 8 times error count)

2) When the discharge temperature is detected

in an abnormal stop zone, the unit stops the

compressor and restarts after 2 minutes

30 seconds.

The error counter is cleared when it has

continued the operation for 6 minutes.

If the abnormal stop zone has been detected

by 8 times without clearing of counter, an

error “P03” is displayed.

∗ The cause is considered as excessively

117

107

103

100

93

Frequency down

Frequency slow-down

Frequency holding

Frequency slow-up (Up to command)

little amount of refrigerant, defective PMV,

or clogging of cycle.

As command is

3. Current release control

The output frequency and the output voltage are controlled by AC current value detected by T02 on the outdoor P.C. board so that input current of the inverter does not exceed the specified value.

Objective model	SP40, SP45
	COOL	HEAT
I1 value [A]	10.13	10.50

Current [A]

Frequency down

I1	Hold
I1–0.5	Hold
	Normal operation

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