Basler BE-51/27C, Instruction Manual, Page: 50 / 53

BE1-51/27C Tests and Adjustments
5-15
NOTE
Because the lower limit for this pickup is determined by the front panel TAP selector
setting and the front panel TAP (CAL) control position, ensure that these adjustments
have been performed as in the TAP AND TAP (NEUTRAL) selector setting
paragraph.
CAUTION
Steps 3 through 8 provide the application of overcurrent for short periods of time to
allow adjustment while avoiding overheating of the input sensing transformers. To
avoid damaging the relay, do not attempt to apply a constant high level of input current
for adjustment of the front panel
INST 1 , INST 1 (NEUTRAL) , or INST 2 controls.
NOTE
For relays with two-phase-and-neutral or three-phase-and-neutral sensing (sensing
input types D, T, and J), perform Steps 9 through 14.
VOLTS INHIBIT ADJ or VOLTAGE INHIBIT ADJ Setting
Step 1. Verify that the test setup is performed.
Step 2. Adjust the test voltage to the desired inhibit level (between 40 and 120 Vac).
Step 3. Starting at fully CCW, slowly adjust the front panel VOLTS INHIBIT ADJ or VOLTAGE INHIBIT
ADJ (move CW) until the appropriate front panel VOLTS INHIBIT or VOLTAGE INHIBIT indicator
just illuminates. The voltage inhibit level is now established. If multiple phases are sensed by the
relay, all phases will have the same voltage inhibit level.
INST 1 Control Setting
Step 1. Verify that the test setup is as described in TAP and TAP (NEUTRAL) selector setting, Steps 1
through 6.
Step 2. Connect the test setup to the instantaneous 1 element output terminals (2 and 10) as shown in
Figures 5-1 through 5-6. The timer should not be connected.
Step 3. Set the front panel INST 1 control to a position approximating the desired instantaneous 1
overcurrent pickup point for the relay.
Step 4. Apply current to the relay.
Step 5. Rapidly increase the overcurrent input to the relay until the instantaneous output relay just
energizes. Note the overcurrent threshold reading on the ammeter.
Step 6. Remove input current.
Step 7. Reset the INST TARGET (if present).
Step 8. If the overcurrent threshold reading from Step 5 was too high or low, adjust the front panel INST
1 control CCW to lower (or CW to raise) the instantaneous 1 overcurrent pickup point. Repeat
Steps 4 through 8. If the overcurrent threshold reading from Step 5 was NOT too high or low,
proceed to Step 9.