10 Chapter 2 Installation Instruction
NetSure 731 A41 Subrack Power System User Manual
The digital input ports of W2453X1 user interface board needs to connect active dry contact. Dry contact spec as
following:
Digital output: relay isolation, Max.:30Vdc/1A, 125Vac/0.5A, 60W; Min.: 10uA@10Vdc, alarm is definable.
The functions of the interfaces are shown in Table 2-6.
Table 2-6 Dry contacts definition
Type
Default alarm
Description
Dry contact 1
AC power failure
/
Dry contact 2
DC overvoltage or DC undervoltage
Four-level DC voltage alarms
Dry contact 3
Rectifier alarm
Except rectifier lost and multi-rectifier alarm
Dry contact 4
Priority LLVD
/
Dry contact 5
Non-priority LLVD
Exist when the second user interface board is installed
Dry contact 6
/
Exist when the second user interface board is installed
Dry contact 7
/
Exist when the second user interface board is installed
Dry contact 8
/
Exist when the second user interface board is installed
With default settings, when the preceding alarms are generated, the contactors of the corresponding dry contacts
should change their status. That is, the normally-open contactors close, and the normally-closed contactors open. All
the status changes should be verified by a multimeter. After the alarms are removed, the dry contacts (Do) should
back to the original state.
Dry contact definition is settable in the controller, please refer to M221S Controller User Manual.
The user interface board illustration is as shown in the following:
Figure 2-13 W2453X1 user interface board illustration
Connecting NetSure 731 A41-S8 Signal Cables
The communication port of the M830B controller is shown in Figure 2-18.
用户接口板
(DI/DO板)
信号线缆
RS485端子
User interface board
User interface board
(DI/DO board)
RS485 terminal
Figure 1-2 Communication port of M830B controller