Motorola DIMETRA MTS 2 Installation, Configuration And Basic Service Manual page 140

Expansion Cabinet Power-Up
Procedure 4-16 How to Power-Up MTS and Expansion Cabinet (Continued)
Using a digital voltmeter (DVM), verify a voltage level between -44 VDC and -60 VDC at the
4
"-48 VDC"- (hot) terminal and "Return"- terminal of the Power Supply Unit.
4-64
• Output and temperature indicator (DC OUT / TEMP):
◦ Green LED when DC output voltages are present and within limits
◦ Red LED when one or more of the output voltages failed
◦ Red LED flashes when over temperature is detected, 5 -10 °C before shutdown
AC input indicator (AC IN STATUS):
•
◦ Green LED when AC input voltage is present and within limits
◦ Red LED when AC input voltage is not present or out of limits
• DC input and charging indicator (DC IN STATUS):
◦ Green LED when PSU is supplied from DC input
◦ Amber LED (green/red) when battery is charged
◦ Red-green flashing LED when a backup battery or a DC source supplies the PSU
and the source voltage drops below 43 VDC ±3%
◦ Red LED when no source connected to the DC input or the DC voltage is below
40.5 V
The Power Supply Unit automatically recognizes a connected backup battery and
begins charging, no matter if in operation or at start up.
Chapter 4: Hardware Installation
6802800U74-N September 2009