ERL 8700/BUS, Руководство пользователя

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6 Testing the B-PRO Functions
6-2 B-PRO User Manual 8700 D01908R02.12
Figure 6.2: Calibration error - out of range
For example when you select voltage V
A
for calibration, a prompt appears
which asks you which quantity the relay should try to calibrate. If a 66 volt
phase to neutral quantity is applied to the back V
A
terminals, 66.0 volts would
be indicated as the desired calibration.
In a similar way, you are prompted to go through all 21 ac analog quantities
and provide the information about the injected calibration quantities. You must
have a test source to perform the function. Only the magnitude of the analog
input requires calibration, not the angle.
When an input analog channel is calibrated, the quantity measured you can ver-
ify it by selecting the
Metering menu and the Analog Quantity submenu. VA
of the ac voltage input is used as a reference quantity by B-PRO. Therefore, if
it is absent, there is not a locked, valid relationship among all of the analog
quantities.
Testing the External
Inputs
To test the external inputs, connect the relay to a laptop in Terminal Mode, Ser-
vice level>Metering>I/O . This screen displays the status of the Inputs and Out-
put Contacts. Placing a voltage of 125 Vdc nominal, (150 V maximum), to
each of the external inputs in turn causes the input to change from Low to High
status. These inputs are polarity sensitive and this screen has a 0.5 seconds up-
date rate. The inputs should reset when the dc voltage drops below about 80
volts. Testing requires application of a correct voltage polarity.
Testing the Output
Relay Contacts
Test the output relays to verify their integrity using the Utilities>Mainte-
nance>Outputs. The output contacts are closed by pressing the
Enter key. Tog-
gles the output contacts from open to closed by pressing the Enter key. Verify
the output contact status using an ohmmeter. When you exit this sub-menu, all
contact status reverts to the open position
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