Pickup-Instantaneous Overcurrent - ABB DPU 1500R Instruction Book

ABB Distribution Protection Unit 1500R
5. To confirm the ground pickup, lower the 51N (IN>) setting to 5.0 A. To do this:
a. Access the settings menu by pressing "E" on the MMI.
b. Scroll to "Settings."
c. Hit "E" and scroll to "Change Settings."
d. Hit "E" again to access "Prim Settings."
e. Enter the password (four spaces for factory default) and press "E."
f. Scroll to "51N Pickup A" and Press "E."
g. Press the left arrow key until 5.0 is displayed; hit "E" to accept this value.
h. Press "C" twice to get out of settings change.
i. Press right or left arrow key to respond "YES" to the "Save Settings" prompt. Press "E."
j. Press "C" until the present metering values are displayed.
6. Apply 4.5 A to the DPU1500R as shown in Figure 11-4. Gradually increase the current until the PICKUP LED just
lights. This should be within ±3% of the pickup (5 A). This confirms the ground pickup.
7. Decrease the input current to 0 and reset targets, if necessary, by pressing the target reset push button.
8. Repeat step 5 above to reset the 51N (IN>) pickup to 6.0 amps.
Pickup—Instantaneous Overcurrent
Follow these steps to test the instantaneous overcurrent of the pickup current:
1. To test the 50P-1 (3I>>1) phase instantaneous unit:
a. Connect the DPU1500R as shown in Figure 11-3.
b. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-1) to the relay or 15.3 A.
c. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% of the setting or
±1.26 A (±126 A primary). This confirms phases A (L1) & B(L2). Targets that should be lit are A (L1), B (L2)
and INSTANTANEOUS.
d. Decrease the input current to 0 and reset targets by pressing the target reset push button.
2. To test the 50N-1 (IN>>1) ground instantaneous unit:
a. Disable the 50P-1 (3I>>1) function via the "Change Settings", "Primary Settings" Menus.
b. Connect the DPU1500R as shown in Figure 11-4.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-1) to the relay or 15.3 A.
d. Gradually increase the current until the INSTANTANEOUS LED lights. This should be ±7% (from Table 11-1)
of the setting or ±1.26 A (±126 A primary). Targets N and INSTANTANEOUS should be lit.
e. Decrease the input current to 0 and reset targets by pressing "C" on the MMI.
3. To test the 50P-2 (3I>>2) phase instantaneous unit:
a. Enable the 50P-2 (3I>>2) function and disable the 50N-1 (IN>.1) function via the "Change Settings", "Primary
Settings" Menus.
b. Connect the DPU1500R as shown in Figure 11-3.
c. Apply approximately 85% of the instantaneous pickup current (18 A from Table 11-1) to the relay or 15.3 A.
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Maintenance and Testing