Hardware reference guide

Pwr. & Grnding. Guide
35013379 02 October 2007 789
The proper method for starting systems powered by summable power supplies is to
insert both supplies in the backplane in an unpowered state, and then apply power
to each supply. For 140CPS11410, 140CPS21400, and 140CPS414 models, there
is no requirement to power each supply simultaneously. For 140CPS11420, or
wherever this module is operated with a 140CPS11410, the delay between the two
powering times should not be greater than five seconds. The system designer must
realize that the operation of the summable supply described above is independent
of total backplane load, i.e., even if the total load on the backplane is less than 8 A,
if there are two summable supplies installed in the backplane, the system POK is
generated as shown in this section.
For the special case of a single summable supply used as a standalone, the system
POK generation reverts to the standalone case as shown previously in this section.
Redundant
Power Supplies
Five redundant power supply models are offered.
Similar to the summable supplies, the Quantum redundant power supplies also
contain circuitry which forces the installed power supplies to share output current
almost equally. An important difference between the summable and the redundant
supply lies in the system POK generation circuitry.
The Quantum system POK signal in systems powered by redundant power supplies
is true (power is OK) if either or both internal POK is true. The following figure shows
the internal Quantum redundant supply POKs are ORed to create the Quantum
System POK.
• 140CPS12400 115 ... 230 Vac input 8 A output
• 140CPS12420 115 ... 230 Vac input 10 A output
• 140CPS22400 24 Vdc input 8 A output
• 140CPS42400 48 Vdc input 8 A output
• 140CPS52400 125 Vdc input 8 A output
Note: Redundant power supply module health may be monitored in an I/O module
health status word. (Refer to the STAT Block description in Modicon Ladder Logic
Block Library User Guide, 840USE10100.)
Quantum
System
POK
Redundant CPS
Internal POK
Redundant CPS
Internal POK
OR
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com