Fan Control Circuit - Tripp Lite SU60KX Manual

2 Theory of Operation (continued)

2.12 Fan Control Circuit

Located on NH-SYS-M board (System MCU and Control Circuit)
FAN-C
5VS
5VS
Located on NH-SYS-P board (Auxiliary Power for System, Detect Circuit for Voltage and Current)
Located on NH-SYS-S or NH-SYS-SA board (Driver Circuit for Bypass SCR)
FAN_SPEED_A
(a) Fan C is located at the rear panel of the power module's input EMI fi lter. Fan A and Fan B are both located at the heat-sink for bypass SCR.
(b) MCU controls fan C via FAN-C (17).
(c) MCU detects a fan C failure via (18).
(d) When in bypass mode, FAN_A (143) will be high to control fan A; fan B will be off. If fan A experiences a failure, fan B will turn on.
(e) MCU detects a fan A failure via FANLOCK_A (19).
(f) MCU detects a fan B failure via FANLOCK_B (48).
+12VS
CM 123
G1
UM 8A
1 16
FAN-SPEED-C
(17)
G1
RM 161
5VS
FAN_A
(143)
FAN_ON
FANLOCK_A
(19)
RM 163
DM 32
DM 34
RM 166
FAN_LOCK_A
RM 168
5
UM 12B
4
4081
6
FAN_ON
G1
CM 127
+12VS
CP96 RP194
G1
FAN_SPEED_C
TO FAN
DSA10
+12VS CNSA4
1
2
CSA16 RSA21
3
G1 D
QSA9
G
S
G1
RM 6
(18)
10K
CM 124
RM 162
5VS G1
+12VS
1
UM 12A
3 4 13 5
4081
2
UM 8D
ULN2003A
RM 164
G1 5VS
FANLOCK_B
(48)
RM 167
+12VS
8
UM 12C
10 6 11 7
4081
9
UM 8F
ULN2003A
DP5
CNP16
1
2
3
FANLOCK_C
D
QP14
G DP6
S
G1
DSA11
+12VS
CSA17 RSA22
FAN_LOCK_A
G1 D
QSA8
G
FAN_SPEED_B
S
G1
60
5VS
RM 7
10K
FANLOCK_C
CM 136
104
G1
UM 8E
12
FAN_SPEED_A
ULN2003A
DM 33
FAN_LOCK_B
UM 8G
10
FAN_SPEED_B
ULN2003A
CNSA5
1
2
3
FAN_LOCK_B