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64
PRELIMINARY
2 Theory of Operation (continued)
2.17 Communication Circuit for Input Dry Contact and REPO
Located on NH-SYS-R board (Circuit for RS232, Output Dry Contact, Parallel Port, Connector to connect with each Power Module,
Circuit for 2 Slots)
Located on NH-SYS-M board (System MCU and Control Circuit)
REPO
1
2
4
3
UX11
G4
RE P O
RX 28
RX 25
CX 14
#R_EPO
RX 26
5VS
G1
1
2
4
3
UX12
G4
RX 37
RX 34
CX 17
RX 35
5VS
G1
1
2
4
3
UX13
G4
RX 45
RX 42
CX 22
RX 44
5VS
G1
INPUT DRY CONTACT
IP_DRYB
DRY1
DRY2
1
2
CNX4
+12VSF
RE P O
M2
1
2
3
4
CNX5
M3
+12VSF
IP_DRYA
+12VSF
IP_DRYB
(80)
(79)
(86)
RM1 1 8
CM6 9
G1
#R_EPO
RM1 2 3
CM8 2
G1
DRY1
RM1 2 9
CM8 7
G1
DRY2
R_ EP O
DRY_1
DRY_2
(a) System MCU will detect input dry contact via DRY_1 (79) and DRY_2 (80)
(b) REPO (Remote Emergency Power Off) can be detected via R_EPO (86) by system MCU (high active).
(c) When REPO has activated, System MCU will shut down the output. After the REPO release, the unit will stay in bypass mode.