ABB MPRC086444-003 I/O module card

Description

MPRC086444-003 The 745 is rated for 1.9 kV AC for 1 second or 1.6 kV for 1 minute (as per UL 508) isolation

between relay contacts, CT inputs, VT inputs and the safety ground terminal G12. Some

precautions are required to prevent 745 damage during these tests.

Filter networks and transient protection clamps are MPRC086444-003 used between control power and the

filter ground terminal G11. This filtering is intended to filter out high voltage transients,

radio frequency interference (RFI), and electromagnetic interference (EMI). The filter

capacitors and transient suppressors could be MPRC086444-003damaged by application continuous high

voltage. Disconnect filter ground terminal G11 during testing of control power and trip coil

supervision. CT inputs, VT inputs, and output relays do not require any special precautions.

Low voltage inputs (< 30 V) such as RTDs, analog inputs, analog outputs, digital inputs, and

RS485 communication ports are not to be tested for dielectric strength under any

circumstance.

Prior to energizing any of the Logic Inputs, ensure that doing so will not

cause a relay trip signal to be issued beyond the blocking switches.

These should have been opened prior to starting on these tests. If you

wish, you can disable the Logic Input functions by setting:

• S3 LOGIC INPUTS  LOGIC INPUT 1 (16)  LOGIC INPUT 1(16)

FUNCTION: “Disabled”

 Connect a switch between Logic Input 1 (Terminal D1) and +32 V DC

(Terminal D12), as shown MPRC086444-003 above (alternatively, use the wet contact

approach shown in the same figure).

Logic Inputs can be asserted with either an opened or closed contact, per

the user choice. Verify/set the type of Logic Input to be used with the

following setpoint:

• S3 LOGIC INPUTS  LOGIC INPUTS  LOGIC INPUT 1 (16) 

INPUT 1(16) ASSERTED STATE

 Display the status of the Logic Input using the A1 STATUS  LOGIC

INPUTS  LOGIC INPUT 1(16) STATE actual value.

 With the switch contact open (or closed), check that the input state is

detected and displayed as Not Asserted.

 Close (open) the switch contacts. Check that the input state is detected

and displayed as Asserted.

 Repeat for all the relay logic inputs which are used in your application.

To verify the proper functioning of the output relays, enable the Force

Output Relays function by setting:

• S6 TESTING  OUTPUT RELAYS  FORCE OUTPUT RELAYS

FUNCTION: Enabled

The Test Mode LED on the front of the relay will come ON,

indicating that the relay is in test mode and no longer in service.

In test mode all output relays can be controlled manually.

 Under S6 TESTING  OUTPUT RELAYS set the FORCE OUTPUT 1 to

FORCE OUTPUT 8 setpoints to De-energized.

 Using a multimeter, check that all outputs are de-energized.

For outputs 2 to 5, the outputs are dry N.O. contacts and for outputs 6 to

8, the outputs are throw-over contacts (form-C). Output 1 is a solid state

output. When de-energized, the resistance across E1 and F1 will be

greater than 2 MΩ; when energized, and with the multimeter positive

lead on E1, the resistance will be 20 to 30 kΩ.

 Now change the FORCE OUTPUT 1 to FORCE OUTPUT 8 setpoints to

Energized.

 Using a multimeter, check that all outputs are now energized.

 Now return all output forcing to De-energized and disable the relay

forcing function by setting S6 TESTING  OUTPUT RELAYS  FORCE

OUTPUT RELAYS FUNCTION to Disabled.

Accuracy of readings taken in this section should be compared with the specified

accuracies in Specifications on page 2–5. If the measurements obtained during this

commissioning procedure are ‘out-of-specification’ verify your instrumentation accuracy.

If the errors are truly in the relay, advise the company representative.

7.4.2 Current Inputs

The general approach used to verify the AC current inputs is to supply rated currents in all

the input CTs. Displayed readings will then confirm that the relay is correctly measuring all

the inputs and performing the correct calculations to derive sequence components,

loading values, etc. Since the displayed values are high-side values, you can use this test to

verify that the CT ratios have been correctly entered.

 If you are using a single phase current supply, connect this current signal

to all the input CTs in series, winding 1, 2 and 3, if using a three

winding configuration, and the ground CT input(s). Adjust the current

level to 1 A for 1-amp-rated relays and to 5 A for 5-amp-rated relays.

Some elements may operate under these conditions unless all

elements have been disabled!

 With the above current signals ON, read the actual values displayed

under A2 METERING  CURRENT.

The actual values can be quickly read using the EnerVista 745 Setup

software.

 Read the RMS magnitude and the phase of the current signal in each

phase of each winding.

Note that the Winding 1 Phase A current is used as the reference for

all angle measurements.

I phase rms displayed = Iphase input x CT ratio for that winding

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