15
TMN/TMP SERIES
OPERATING MANUAL
a failed module results in virtually infinite MTBF.
Table 14-1 Redundant and Non-Redundant Operation
14.2
Non-Redundant Operation. Higher output current can be achieved by
operating the rack in a non-redundant mode as seen in Table 14-1. How-
ever, in this case if a module fails, the load will lose power since only part
of the required current can be supplied by the remaining modules, and
they will go into current limit. The failed module, however, can be quickly
replaced to restore the load current.
14.3
Multiple Parallel Rack Operation. Multiple racks can also be operated
in parallel by interconnecting their current share terminals (J1 Pin 10).
The total power can be expanded by several times. In this case N+1
redundant operation is achieved by reserving one module of the total for
redundancy. For example, if two full 19-inch racks are employed with a
total of six modules, then 5+1 redundancy is achieved and the full load
must be able to be carried by the output of five modules. In such applica-
tions each set of remote sense wires must be separately connected to the
point of load. See Figure 8 for a simplified illustration of two TMN/TMP
racks connected in parallel.
15.0
RACK CONTROL & SUPERVISORY SIGNAL CONNECTIONS
15.1
Connections for control and supervisory signals are made at the rack rear
to connector J1, a standard 25-pin subminiature D connector (Positronics
No. SD25F0S5OOX with FC752OD pins). The mating connector is
Positronics SD25M00OOZ with MC7520D pins.
Redundant, 2+1
3
24
84
100
Non-Redundant
3
24
126
150
Redundant, 2+1
3
28
72
86
Non-Redundant
3
28
108
129
Redundant, 2+1
3
48
42
50
Non-Redundant
3
48
63
75
MODE
NOM.
VOLTS
NUMBER OF
MODULES
TMN AMPS
MAX.
TMP AMPS
MAX.
