Part 2 Functions & Controls

5.6 Power Relay Control

•Power relay turns on 1 second later after the power is supplied to the outdoor unit.

•Control sequence : power on → PTC operating → power relay on

5.7

Inverter

 

 

 

 

 

U V W

 

+

U

3Ø

 

 

 

 

V

Comp.

 

 

W

Motor

 

 

 

1.The single phase power AC is converted into DC.

2.The single phase power DC is converted into a three phase chopped DC voltage with a variable frequency.

3.When the frequency changes, the rotation speed of the compressor changes resulting in a changed refrigerant circu- lation. This leads to changeable amount of the heat exchange per unit.

- 20 -

Only for training and service purposes

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Heat Controller VMC09SB-1/VMH09SB-1, VMC18SB-1/VMH18SB-1, VMC30SB-1/VMH30SB-1 service manual Power Relay Control, Inverter
Page 19 Page 21

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