KEPCO KDA 24V Alarm Module - Manual

©2011, KEPCO, INC 1
Data subject to change without notice 228-1694 REV 4
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
http://www.kepcopower.com email: [email protected]
O P E R A T O R M A N U A L
KEPCO
An ISO 9001 Company.
KDA 24
SERIES
KDA 24 SERIES
ALARM MODULE
I — INTRODUCTION
SCOPE OF MANUAL. This Operator Manual covers the
installation, checkout and operation of the KDA 24 Series
Alarm Modules.
DESCRIPTION. The Kepco KDA 24 Series Alarm mod-
ules are designed to monitor two 24V power supplies, and
provide an alarm indication (both visual and Form “C” relay)
when voltage is not within a preset range. The KDA 24R
models contain built-in blocking (also called ORing or isola-
tion) diodes needed for parallel-redundant configurations.
KDA 24A is designed to monitor two independent power
supplies; it includes neither blocking diodes nor reverse
protection diodes.
Each alarm module has two identical circuits (A and B), one
for each input. For KDA 24R these circuits are internally
connected for parallel redundancy of the two input power
supplies (see Figure 2). For KDA 24A the two circuits are
completely independent (see Figure 3).
Trimpot adjustments from the front (see Figure 1) allow
independent adjustment of high and low alarm ranges for
both inputs. When input voltage is within the preset range,
the internal alarm relay energizes and the OK contact is
connected to COM. If voltage is out of range, the relay de-
energizes and the FAIL contact is connected to COM. In
addition, the DC OK indicator turns off and the appropriate
OV (overvoltage) or UV (undervoltage indicator turns on.
Screw terminal connections available at the front panel
(top) provide easy access to FAIL, OK, and COM relay con-
tacts.
USER CONFIGURABLE OPTIONS. KDA 24 Series
are supplied with the DIN Rail clips rotated 180 degrees.
Plugs are included to cover the HIGH and LOW trimpots if
desired to prevent unauthorized adjustments once they
have been preset.
II — FEATURES
• Screw terminals for easy access wiring connec-
tions (see “Connections” on page 4 for details).
• Case acts as heat sink with no external fins or
extrusions.
• Dual Input.
• Wide Input Operating Range: 12 - 35V d-c.
• Alarm settings maintained within ±1% after set-
ting.
• Suitable for n+1 redundancy applications of 24V
d-c power systems (KDA 24R).
• Built-in isolation (ORing) diodes (KDA 24R).
• Alarm relay, isolated contact outputs: N.C., COM,
N.O.
• Mounting: DIN rail NS35 MM styles or G-32MM
styles or panel/chassis screw mounting; DIN clips
are reversible.
• Dual DC OK LED (green).
• Dual Undervoltage LEDs (yellow).
• Dual Overvoltage LEDs (red).