Operating instructions

2-6 Overview
Port Locations
Although there are five port plugs in the cover of the MBV3-100* only the input test point
enables user access (Figure 2-6). The input and output ports provide connection for coaxial
cables and are protected by factory-inserted plastic cap plugs. Discard the plastic cap plugs
when you install the cable connectors.
Figure 2-6
Housing ports
Power Supply
The lid of the amplifier houses the model MPPS-II 60/90 power pack (Figure 2-7). It provides a
regulated 24 VDC output at 2.0 amps maximum over an AC input voltage range from 38 VAC to
90 VAC rms. The input voltage wave shape is either a squarewave or a sinewave. The surge
protector and the EMI filter protect the power pack and amplifier from transient spikes. An
integral fast-acting zener diode provides additional surge protection.
The preregulator is a fixed frequency switching regulator that presents a near perfect power
factor to the input line and provides overvoltage and overcurrent protection. A precision output
regulator provides a precise output voltage and is also protected against overcurrent and short
circuits. If a short circuit is detected, the power supply shuts down and the regulator initiates a
sequence of line test pulses at approximately one-half second intervals. The regulator continues
these pulses for the duration of the short circuit but returns to normal operation when the fault
is cleared.
MBV3-100* Installation and Operation Manual