Installing the Encoder
Powering Up the Unit
Makito User’s Guide, v2.1.0, Issue 01
49
MB21 (21-Slot) Chassis
WARNING
To prevent electric shock, do not remove the cover of the MB21 chassis.
There are no user-serviceable parts inside. The MB21 chassis is to be installed and
serviced by qualified personnel only.
Figure 2-14
MB21 Chassis Rear View showing Power Connectors
Each socket on the PDU (Power Distribution Unit) powers a pair of PSUs (Power Supply
Units). Two PSUs are sufficient to power a fully loaded chassis.
The MB21 chassis is designed to tolerate the following without loss of installed card func-
tionality:
•
The loss of one AC supply (120/240V) source.
Since there are two power inlets on the MB21 chassis, the cards in the chassis can
operate with only one powered; however, the chassis would not be fully redundant.
•
The loss of one or two PSUs of the four PSUs in the MB21 chassis in any combination.
PSU Power On/Off Switches
AC Power
PSU Alarm LED (red)
PSU Alarm Reset
Receptacles
PSU Status LED
(green)
button