ABB Distribution Protection Unit 1500R
11-1
Maintenance and Testing
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website:www.abb.com/papd
Maintenance and Testing
Because of its continuous self-testing, the DPU1500R requires no routine maintenance. However, you can conduct
testing to verify proper operation. ABB recommends that an inoperative unit be returned to the factory for repair. If you
need to return a unit, contact your local ABB sales office for a return authorization number.
High-Potential Tests
High-potential tests are not recommended. If a control wire insulation test is required, completely withdraw the
DPU1500R from its case and perform only a DC high-potential test.
Withdrawing the DPU1500R from its Case
The DPU1500R can be disassembled to install optional equipment or to change jumper settings of the selectable
output contacts, between normally open (NO) and normally closed (NC). Follow these steps to disassemble the unit:
WARNING:
Removal of the relay from the case exposes the user to dangerous voltages. Use extreme care.
Do not insert hands or other foreign objects into the case.
1.
Loosen the knurled screws on the face of the DPU1500R and gently remove the face and attached circuit board
by grasping the knurled screws and pulling the unit straight forward. Pulling the board out at an angle or otherwise
stressing the board on extraction may damage the unit. Once removed from the case, position the unit face down
on a static secured mat.
2.
Install the desired options according to the instructions provided with those options. The output relays are on the
top-left-rear section of the board (when viewed from the front) under the metal shield. Movable jumper links
alongside the output relays set the selectable output contacts to normally open (NO) or normally closed (NC). To
access the jumper links it is necessary to remove the shield, which is secured by a screw and 1/4" PCB mounting
stud. If an AUX COM board is installed, it will be necessary to remove the board completely, proper ESD
precautions taken, to allow access to the shield.
3.
To reinstall the unit into the case, carefully align and insert the lips on both sides of the board into the guide rails
on the inside walls of the case and gently push the unit straight inward until it fully seats in the case. Secure the
knurled screws.
System Verification Tests
Besides continuously monitoring a Self-Check output contact, perform routine hardware tests to verify that the DPU1500R
is functioning properly. Run these tests via the MMI or via the communications port and the Windows External
Communications Program. The tests are:
1.
Confirm pass/fail status of each Self-Check element by using the Test Menu.
2.
Confirm continuity of current and voltage through each input sensor by using the Meter Menu.
3.
Confirm continuity through each optically isolated contact input for both the opened and closed condition by
using the Test Menu.
4.
Verify operation of each output contact by using the Test Menu.
5.
Confirm that all relay settings are correct by using the Show Settings Menu.
6.
Check the Fault and Operation Records for proper sequential operation.
