Power Line Carrier ____________________________________________________________________
RF-MCGARDPRO
Hubbell Power Systems, Inc.
–
RFL™
Products
July 1, 2022
©2022 Hubbell Incorporated
5-71
Table 5-28 Motherboard, TB1 Terminal Assignments
Terminal Numbers
Terminal Assignments
TB1-1
Internal Amp Fail Relay COM
TB1-2
Internal Amp Fail Relay NO
TB1-3
Internal Amp Fail Relay NC
TB1-4
External Amp Fail Relay COM
TB1-5
External Amp Fail Relay NO
TB1-6
External Amp Fail Relay NC
TB1-7
Chassis Ground
TB1-8
Earth Ground*
*Note
At TB1-8 on the Mother Board Rear Panel a ground wire should be connected. Ideally this wire
should go directly to the sub-station ground bar, if this is not feasible, shorting the wire to TB1-7
(Chassis ground) is an alternate method. This will cause surge currents to pass through the
Mother Board and chassis before exiting to ground. Connecting directly to the sub-station ground
bar is preferred.
5.6.10 Quick Tuning Procedure and Jumper Setting Overview
1.
For the selected center frequency, set the jumpers as described in the Microsoft Excel®
Worksheet “9508 Rx Filter Programming Sheet.xls.”
2.
Connect a signal generator (HP3336B or HP3325A or equivalent) to J2 of the Rx Filter.
Connect a selective level meter (Wandel & Golterman SPM-32A or 33A, Rycom
6021A, Signalcrafters 110, or equivalent) with a terminating impedance of 50 Ohms, to
J3 of the RX Filter. Use J4 as the ground connection.
3.
Set the center frequency of the test equipment (signal generator and selective level
meter) according to the selection made in Step 1.
4
Adjust inductors L1, L2 and L3 to have a minimum loss (highest voltage level) at the
selected center frequency.
For 8kHz bandwidth Rx Filters, perform steps 5, 6 and 7.
For 16kHz bandwidth Rx Filters perform steps 8, 9 and 10.
5.
Check the attenuation at the selected center fre/- 4kHz <0.35 dBm.
Adjust L2 to have a balanced response (the same level at +4 and –4 kHz) dBm.
6.
Check the attenuation at the selected center fre/- 12kHz.
Adjust L1 to get the desired attenuation at +12 kHz >9.5 dBm.
Adjust L3 to get the desired attenuation at +12 kHz >9.5 dBm.