2 Theory of Operation (continued)

2.22 Transformer Over Temperature Detection

(This function is only for SU40K, SU60K, SU80K, SU60KTV, and SU80KTV models) Located on NH-M board (System MCU and Control Circuit)

5VS

RM4

1K

TOOUTPUTXFMR

CNM10 RM175

OPRTTemp (61)

2

 

1392 CM137 ZD4

CON2

104

5V1

G1

5VS

RM8

1K

TOINPUTXFMR

CNM11

2

1

CON2

RM176

IPRTTemp

(51)

 

 

392CM138 ZD5

104 5V1

G1

(a)CNM10 connects to the output transformer, CNM11 connects to the input transformer.

(b)Thermal switch sensors are mounted on the coils of the transformer.

(c)The thermal switch sensor will be open when the transformer coil’s temperature exceeds 150. MCU can detect the temperature status through IPRT Temp (51) and OTRT Temp (61).

Note: For international models (SU20KX, SU40KX, SU60KX and SU80KX), short-pins must be inserted into CNM10 and CNM11.

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Tripp Lite SU60KX manual Theory of Operation