Motorola BLE*/* - Manual (Page 35)

3-14 Amplifier Setup
BLE*/* Installation and Operation Manual
Powering and Surge Protection
In conventional applications, the BLE*/*s are powered through the input port.
CAUTION!
To avoid damage to the hybrids, it is recommended that you remove the input pad (JXP-IN) before you apply power to
the BLE*/*.
A 20-ampere, blade-type fuse is furnished in the amplifier module and provides overcurrent
protection for ac power applied to the input. You can power the BLE*/* from the output without
passing power through to the input port. To block power from the input port, remove the
power-block jumper illustrated in Figure 2-8.
WARNING!
To avoid possible injury to personnel or damage to the equipment, remove 60/90 volt ac power from the system
before you remove any components from the housing.
The BLE*/* is shipped from the factory configured for 38 through 90 Vac powering as described
in Section 2, “Overview”. To configure the BLE*/* for 55 Vac through 90 Vac operation:
1 Remove the electronics chassis from the housing.
2 Remove the power-supply cover.
3 Move the LO / HI selector (jumper J1 on the power-supply board) from the LO to HI position.
Figure 2-6 illustrates the jumper location.
4 Re-install the power-supply cover and torque the screws to 10 to 12 in-lbs.
5 Re-install the electronics chassis in the housing and torque the hold-down bolts to 18 to
22 in-lbs.
Standard surge protection is provided in the power supply by a heavy-duty, 230-volt, gas
discharge surge protector. As an option, you can replace the gas discharge tube with the FTEC
overvoltage protector. The FTEC has a firing potential of approximately 245 volts.
To install the FTEC:
1 Remove the electronics chassis from the housing.
2 Remove the power-supply cover.
3 Remove the gas-tube surge protector, illustrated in Figure 2-6.
4 Replace it with the FTEC.
5 Re-install the power-supply cover and torque the screws to 10 to 12 in-lbs.
6 Re-install the electronics chassis in the housing and torque the hold-down bolts to 18 to
22 in-lbs.