Hardware reference guide

Pwr. & Grnding. Guide
788
35013379 02 October 2007
Summable
Power Supplies
Four summable power supply models are offered.
A summable power supply may be used as a standalone power supply without
reservation in any Quantum system.
For systems configured with a mix of CPS, NOM, expert, and l/O modules, whose
total current consumption from the backplane exceeds the current provided by one
summable supply, two summable supplies may be used in a single backplane. In
such a system, the total current available on the backplane is the sum of the
capability of both supplies:
z 16 A for two 140CPS11410,
z 16 A for two 140CPS21400,
z 16 A for two 140CPS41400,
z 20 A for two 140CPS11420,
z 16 A for one 140CPS11410 and one 140CPS11420.
Use only like summable power supplies (same product reference) except for
140CPS11410 and 140CPS11420, which can be summed.
The summable supplies are designed so that they split the current supplied to the
load almost equally, which also has the added benefit of increasing total system
MTBF, and to distribute the thermal load across the backplane. Summable supplies
should be installed at opposite ends of in the Quantum backplane to maximize the
system thermal performance.
The Quantum system POK signal in systems powered by two summable power
supplies is only true (power is OK) when both internal POK signals (in the
140CPSX14X0) are true. Quantum summable power supplies are not hot-
swappable.
The following figure shows that the internal summable supply Quantum POKs are
ANDed to create the Quantum System POK.
• 140CPS11410 115...230 Vac input 8 A output
• 140CPS11420 115...230 Vac input 11 A output
• 140CPS21400 24 Vdc input 8 A output
• 140CPS41400 48 Vdc input 8 A output
Summable CPS
Internal POK
Summable CPS
Internal POK
and Quantum System POK
This document provided by Barr-Thorp Electric Co., Inc. 800-473-9123 www.barr-thorp.com