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71
PRELIMINARY
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)
(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.
G1
RM4
1K
RM8
1K
1
2
CNM1 0
CON2
RM1 7 5
392
CM1 3 7
104
ZD4
5V1
5VS
G1
1
2
CNM1 1
CON2
RM1 7 6
392
CM1 3 8
104
ZD5
5V1
5VS
OPRT Temp
IPRT Temp
(61)
(51)
TO OUTPUT XFMR
TO INPUT XFMR