ABB DSDI110N module cards sold in full series

Description

DSDI110N  Verify that the relay’s nominal current of 1 A or 5 A matches the secondary rating of the

connected CTs. Unmatched CTs may result in equipment damage or inadequate

protection.

The exact placement of a zero-sequence CT so that ground fault DSDI110N current will be detected is

shown below. Twisted pair cabling on the zero-sequence CT is recommended.

Note

IMPORTANT: The relay will correctly measure up to 46 times the current input nominal

rating. Time overcurrent curves become horizontal DSDI110N lines for currents above the 46 × CT

rating.

The 745 has one voltage divider type input for AC voltages. There are no internal fuses or

ground connections. Voltage transformers up to a maximum 5000:1 ratio may be used.

The nominal secondary voltage must be in the 60 to 120 V range.

3.2.7 Logic Inputs

External contacts can be connected to the 16 logic inputs. As shown, these contacts can

be either dry or wet. It is also possible to use a combination of both contact types.

A dry contact has one side connected to terminal D11. This is the +32 V DC voltage rail. The

other side is connected to the required logic input terminal. When a dry contact closes, a

2.2 mA current flows through the associated circuit.

A wet contact has one side connected to the positive terminal of an external DC power

supply. The other side is connected to the required logic input terminal. In addition, the

negative side of the external source must be connected to the relay DC negative rail at

terminal D12. The maximum external source voltage for this arrangement is 300 V DC.

Correct polarity must be observed for all logic input connections or equipment damage

may result.

The label found on the left side of the relay specifies its order code or model number. The

installed power supply operating range will be one of the following.

LO: 25 to 60 V DC or 20 to 48 V AC

HI: 88 to 300 V DC or 70 to 265 V AC

Ensure the applied control voltage matches the requirements of the relay’s switching

power supply. For example, the HI power supply will work with any DC voltage from 88 to

300 V, or any AC voltage from 70 to 265 V. The DSDI110N internal fuse may blow if the applied voltage

exceeds this range.

Control power supplied to the relay must match the installed power supply range. If the

applied voltage does not match, damage to the unit may occur.

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