BECKWITH ELECTRIC M-3425, Instruction Book

Page: 174 / 225

6–37
Testing – 6
59 RMS Overvoltage, 3-Phase (#1 or #2)
VOLTAGE INPUTS:Configuration V1
CURRENT INPUTS:None
TEST SETTINGS: Pickup P Volts (5 to 180)
Time Delay D Cycles (1 to 8160)
Programmed Outputs Z OUT (1 to 8)
Functions 27TN, 32 Disable
Function 59 (#1 or #2) Disable
■ ■ ■ ■ ■
NOTE: If 59 #1 and 59 #2 have different pickup settings, it would be efficient to disable the one with the
lower setting first and test the higher setting operation. The lower setting operation could then be
tested without disabling the higher setting.
1. Disable functions as shown. See Section 3.2, Initial Setup Procedure/Settings, Configure Relay
Data, for procedure.
2. Confirm settings to be tested.
3. Connect inputs in Configuration V1 designated above. See Section 6.1, Equipment /Test Setup
for configuration. Set Voltages = Nominal voltage
4. Pickup Test: Press and hold the TARGET RESET button and slowly increase the input voltage
on phase A until 59 PHASE OVERVOLTAGE LED light goes on or the pickup indicator operates
on the computer target screen. The level should be equal to P volts ±0.5 V or ±0.5%*. Release the
TARGET RESET button and decrease the input voltage to nominal voltage and the OUTPUT
LEDs will go out. Press TARGET RESET button to remove targets.
5.
Time Test: With output contacts (Z) connected to stop the timer, apply (P+1) Volts on phase A
and start timing. The contacts will close after D cycles within 20 cycles (RMS) or
" 1 cycle or
"
1% (DFT).
6. Test phases B and C by repeating steps 4 and 5.
7. If testing is complete, enable any functions disabled for this test. If other tests are to be
completed, check the proper functions to disable for the next test and proceed from this point.
* When both RMS and Line-Ground to Line-Line is selected, the accuracy is
"
0.8V or
"
0.75%.