KEPCO KDA 24V Alarm Module - Manual (Page 5)

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]
062411 228-1694 REV 4
5
IV — INSTALLATION
MOUNTING. The KDA 24 Series Alarm modules come
with DIN Rail mounting clips that accommodate: NS
35mm and 32 mm G DIN rails. DIN clips may be reversed
for convenience. The unit may also be chassis mounted
by removing the two clips and using four 4-40 screws
where the clips were installed. See Figure 6 for outline
dimensions. Refer to Figure 4 for operating temperature
derating of KDA 24R models only.
INPUT CONNECTIONS. Input connections are routed
from the bottom and secured via screw terminals from the
front.
KDA 24R. This model consists of two identical channels
(A and B) that connect two power supplies in parallel as
shown in Figure 2. ORing (blocking) diodes are built-in.
Connections to the load must be made through external
distribution points. V– terminal must not be used as distri-
bution points. See Figure 2 for connections; see Figure 1
for component locations.
KDA 24A. This model consists of two independent iden-
tical channels (A and B). Each channel may be used to
monitor a voltage for overvoltage and undervoltage. See
Figure 3 for connections; see Figure 1 for component loca-
tions.
ALARM CONNECTIONS. Alarm connections are
routed from the top and secured via screw terminals from
the front.
ALARM RELAY. The alarm relay is normally energized
as long as input power is within the HIGH and LOW alarm
setting. Isolated alarm relay contacts of each channel are
available from the front panel: COM (common), Normally
Closed (FAIL) and Normally Open (OK).
DC OK INDICATOR. As long as input voltage is within
the High and Low alarm settings the DC OK indicator lights
green. If an alarm occurs (either undervoltage or overvolt-
age detected) the DC OK indicator of KDA 24A and KDA
24R models goes from green to off. DC OK returns to
green when input voltage is again within range.
FIGURE 4. RECOMMENDED MOUNTING ORIENTATION
OF MODEL KDA 24R
V — OPERATION
SETTING HIGH AND LOW ALARMS. High (overvolt-
age) and low (undervoltage) alarms for channels A and B
are set independently. To set the alarm limits for a channel,
connect a variable +24V power supply to the channel input
as described in the paragraph titled “Input Connections.”
on page 5 and monitor the power supply output voltage
using a DVM. Hysteresis causes the alarm to trip at a
slightly different value depending on whether the voltage is
decreasing or increasing. Hysteresis must be taken into
account when setting the alarm trip points. Figure 5 shows
this effect. The factory default adjustment values are
shown in Table 2, as well as the guaranteed adjustment
range (actual adjustment range may slightly exceed guar-
anteed values).
To change the HIGH and/or LOW trimpot settings (within
the ranges listed in Table 2) Kepco recommends using an
insulated adjustment tool, Bourns H-90 (Kepco P/N 218-
1185 or equivalent. In addition, a variable output power
supply with a range exceeding the minimum and maximum
values listed in Table 2 is required. A DVM may be neces-
sary to monitor the power supply output.
Each channel is independent and may be adjusted in any
order.
NOTE: Once all LOW and HIGH alarm adjustments are
acceptable, refer to “Securing Alarm Adjustments”
on page 7 to secure the adjustments.
3043540 AIR FLOW
SEE NOTE 2
NOTES:
1. FOR MOUNTING OF KDA 24R IN ORIENTATION
OTHER THAN SHOWN BELOW, MAX. OPERATING
TEMPERATURE IS 30°C. RESTRICTION DOES NOT
APPLY TO KDA 24A.
2. 1/2 INCH MINIMUM SEPARATION REQUIRED
BETWEEN KDA 24R AND ANY OTHER HEAT-
PRODUCING MODULE ON THE DIN RAIL.