S&C BankGuard PLUS, Руководство по установке

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S&C Instruction Sheet 1011-510
13
Grounded Wye Banks
• Induced voltages in control wiring. Proper shielding is important.
• Ground loops caused by differences in voltage between the grounding points
of tap-point potential devices and those of phase-to-ground potential devices.
Preferably, the secondaries of all the potential devices should be grounded at
one point (per proposed ANSI C57.13.3, “Guide for the Grounding of Instrument
Transformer Secondary Circuits and Cases”).
At this point, you can test the faceplate LEDs and buttons. See Figure 2 on
page 10.
A. Press the POWER SUPPLY button. If the control has power, the button will light
up (green). If the LOCKOUT INDICATOR or ALARM INDICATOR LED turns
ON, press the corresponding RESET button to clear it.
B. Press the ENTER button to test the faceplate LEDs. All LEDs should turn ON
for 2 seconds.
C. Press the NEXT button to scroll through the information on the LCD. (If password
protection is enabled, press the NEXT button again to start scrolling through
password values.) If the display is blank, see the Troubleshooting Instruction
Sheet 1011-550.
The Lockout and Alarm levels can be checked with the “Verify the Calculated Lockout
Level” and “Verify the Calculated Alarm Level” procedures respectively, given in the
Setup
Instruction Sheet 1011-530. The “Field Determination of Need for Unbalance Compen-
sation Procedure”, given in
Setup Instruction Sheet 1011-530, can also be performed to
determine if the Unbalance Compensation feature should be utilized.
Test the Control