Test Mode - ABB REL 301 Instruction Leaflet

Apply a balanced 3-phase voltage:
Failure Alarm (AL-1) relay contacts (Terminals TB3-25 and TB3-26) are closed before the bal-
anced voltage is applied. After applying the balanced voltage verify the normally closed contacts
are open. That is, not in the alarm state.
Press the SELECT push-button again until the METER mode is selected. Displayed is the A
phase current, "IA:" and the value "0.0A", since no current is being applied, and the current angle
is blank. For any current value less than 0.5A, no current angle is displayed. This is also true for
currents IB and IC.
NOTE:
Press the RAISE or LOWER push-button to view the other currents, voltages and associated
angles. See Table 4-2 for the details of the "METER" mode displayed quantities.
5.1.3

"TEST MODE"

The "TEST" display mode provides diagnostics and testing capabilities for REL 301/302. Relay
self-check routine results, as previously described in Step 1 above, and output relay contact
testing are among the functions in the "TEST" mode. Also included is the ability to test front pan-
el LED's and verification of selected contact inputs.
STEP 5
a. Press the SELECT push-button until the "TEST" mode is selected. Displayed is the result
of the self-test routine. Results of the self-check routine are represented by a hex number
in the VALUE FIELD of the "Status" function. A normal status, (relay system passing the
self-check routine) is "STATUS" "0". If REL 301/302 fails the self-check routine another hex
value is displayed, which can be interpreted to provide failure mode information.
For example if the display shows "STATUS" "1B", the binary equivalent which results is:
HEX VALUE
Binary Equiv.
Bit Number
V = 70 ang 0°
A
V = 70 ang -120°
B
V = 70 ang 120°
C
ALL angle measurements (voltages and currents) are with reference to the A
phase voltage (VAG) which is always assumed at zero degrees, relative.
1
0001
7654
I.L. 40-386.1
B
1011
3210
5-5