Equipment Isolation Test - ABB NGC8206 User Manual

6.5.2 Power Supply Voltage Test
6.5.2.1
1) Check that the power supply voltage setting, the power supply current rating and
the cables used for the installation meet the recommended requirements (see
Hardware System
2) Check for a poor cable connection in the cable between the NGC and the power
source. Verify that all field wiring screw terminals are tight.
3) Verify that there are no other devices that may drop an excessive voltage across
them in the power supply circuit (to the NGC) like a fuse, diode or a barrier
device, etc.
4) Disconnect the power supply cable at the NGC termination panel J1.
5) Measure the power supply cable voltage at the connector and compare with the
table recommendations (see
6) Reconnect the power supply cable to the NGC termination panel J1.
6.5.3

Equipment Isolation Test

This test isolates the peripheral equipment from the equation to verify that
excessive current is not being drawn from the power source, thus reducing the
amount of power supplied to the NGC.
This procedure assumes that the previous power supply voltage test was
performed and that no errors were found.
6.5.3.1
1) While the NGC is operating, verify that the voltage at the NGC termination panel
is between 11.5 VDC-16 VDC (for 12 VDC systems) or 22 VDC to 28 VDC (for
24 VDC systems).
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This test assumes a power supply is in good working order
and has previously been tested and qualified to power an
NGC. If the power supply is under suspicion, it is
recommended that it be replaced with a known good power
supply before conducting these tests.
Instructions
Specifications).
If this is a new installation and the external equipment is being powered
from the NGC termination panel, call Totalflow technical support for help in
evaluating the cable and power supply installation requirements.
Correct and retest as necessary.
Correct and retest as necessary.
Correct and retest as necessary.
If the power supply voltage does not meet recommendations, check the
cabling and other loads on the power supply. Also check the power supply
output voltage setting.
Correct and retest as necessary.
Instructions
Table 2–4 and Table 2–5).
2101510 Rev. AG