Optional) Backfeed Protection Card; Optional) Dry Contact Extended Card; Monitoring Interface Card - Huawei UPS5000-E User Manual

UPS5000-E-(50 kVA-300 kVA)
User Manual (50 kVA Power Modules)

2.3.4.4 (Optional) Backfeed Protection Card

Backfeed can cause damage to the UPS, loads, and maintenance personnel. If backfeed occurs,
the backfeed protection card triggers alarm signals, or disconnects the backfeed loop. The
backfeed protection card uses relay contact signals. The signal ports support any power
signals with a voltage of no more than 240 V AC and a current of less than 4 A. For details,
see the UPS5000 Backfeed Protection Card User Manual (03021KQQ).

2.3.4.5 (Optional) Dry Contact Extended Card

The dry contact extended card provides five signal output ports and five signal input ports.
For details, see the UPS5000 Dry Contact Extended Card User Manual (03021RKN).

2.3.4.6 Monitoring Interface Card

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The monitoring interface card provides external ports as well as monitoring and control
functions for the MDU. The ports include the ambient temperature and humidity sensor port,
iBAT 2.0 port, FE port, battery temperature monitoring port, and network management port.
The MDU monitors the UPS, allows users to set parameters, delivers commands, reports
information, and displays the UPS key information and parameters on the LCD.
Figure 2-18
Issue 02 (2017-02-25)
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The dry contact interface card takes effect only after it is set on the monitoring system. Set the
unused dry contact signal to the unused status.
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Set the EPO port to NO or NC as required.
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When multiple UPSs are paralleled, all dry contact signals to be used need to connect to each UPS.
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Single cables require dual-insulated twisted cables. If the length of a power cable is within 25–50 m,
its cross-sectional area must be 0.5 mm
The FE port resembles the RS485 port. Follow the silk screen when connecting
communications cables as, if the RS485 port is mistaken for the FE port during cable
connection, the WebUI cannot be connected and MDU communication fails. Conversely, if
the FE port is mistaken for the RS485 port during cable connection, RS485
communication fails.
If MDU communication fails, the "Comm. failure" message is displayed on the LCD,
screen switching is disabled, the buzzer buzzes, and the fault indicator is red. Once the
fault is rectified, the LCD recovers, and the alarm is cleared.
Only once being set will dry contact signals take effect. Set unused dry contact signals to
the unused state on the LCD.
In a parallel system, ensure that used dry contacts properly connect to each UPS.
shows the signal ports on the monitoring interface card.
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