Daikin FTXD50JV1B [47/164] An refrigeration oil level descent and progression of the dilution which will arise at operation of the compressors will be avoided by controlling the upper limit of frequency at the edge of compressor s changeover from off to on as follows

SiBE04-101 General Functions

Main Function 39

1.18 Compressor Protection Function

Outline An refrigeration oil level descent and progression of the dilution which will arise at operation of the

compressors will be avoided by controlling the upper limit of frequency at the edge of compressor’s

changeover from OFF to ON as follows.

Processing

1. Frequency control

Set the upper limit of the operation frequency by the controls as follows:

 In starting of compressor, start the timer TCG1 and set the upper limit of output frequency at TCG2 for

the time of TCG1.

 When the time of TCG1 expires, start TCG2 timer and set the upper limit of output frequency at TCG2

for the time of TCG2.

 When the time of TCG2 expires, start TCG3 timer and set the upper limit of output frequency at TCG3

for the time of TCG3.

 When the time of TCG3 expires, reset the limit of frequency.

2. Others

 When the compressor operation is stopped at the time of starting this function, reset the timer which is

counting and reset the limit of frequency.

 These controls are not necessary during defrost control.

∗ FCG : Frequency guard for compressor protection

∗ TCG : Timer guard for compressor protection

50 Class 60 Class 71 Class

FCG1 58 Hz 42 Hz 32 Hz

FCG2 64 Hz 64 Hz 64 Hz

FCG3 74 Hz 74 Hz 74 Hz

TCG1 120 sec 120 sec 120 sec

TCG2 240 sec 240 sec 240 sec

TCG3 240 sec 240 sec 240 sec

T CG3

T CG2T CG1

Compressor operation frequency

time

F CG1

F CG2

F CG3

Compressor ON

(R1043)

SiBE04-101.book Page 39 Monday, October 15, 2001 3:08 PM