Page 1
OPERATOR MANUAL
KEPCO
An ISO 9001 Company.
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 modules 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 isolation) 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).
KDA 24
SERIES
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 deenergizes 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 contacts.
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 connections (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 setting.
• Suitable for n+1 redundancy applications of 24V
d-c power systems (KDA 24R).
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©2011, KEPCO, INC 1
Data subject to change without notice 228-1694 REV 4
• 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).
Page 2
KDA 24R KDA 24A
Note: Channels A and B are Identical.
CHANNEL A
CHANNEL B
Note: Channels A and B are Identical.
CHANNEL BCHANNEL A
4
5
OK
FAIL
A
COM
123
12 3
OKDC
B
A
COM
OVUVUV OV
OK
FAIL
B
6
BA
HIGHHIGH
LOWLOW
++-+ - +
BA
10
11
10
11
7
8
9
VOLTAGE LIMIT ADJ.
LEGE ND:
1
COM Terminal (Alarm Relay Common)
Wire routed from top.
2
OK Terminal (Alarm Relay N.O contact)
Relay normally energized when input power OK;
provides connection from COM to OK. Wire
routed from top.
3
UV Indicator
Lights yellow when input voltage is below LOW
setting.
4
OV Indicator
Lights red when input voltage is above HIGH
setting.
5
FAIL Terminal (Alarm Relay N.C contact)
Relay deenergizes for alarm; provides
connection from COM to FAIL. Wire routed from
top.
6
DC OK Indicator
Lights green when input voltage is within HIGH and
LOW settings.
Light goes off if alarm detected.
4
5
4
321
5
OVUV UV OV
OK
COM
FAIL
COM
A
DC OK
A B
OK
FAIL
B
6
4
321
5
6
6
A B
8
7
9
7
8
9
11
7
LOW trimpot
HIGH HIGH
LOW LOW
VOLTAGE LIMIT ADJ.
+ -- +
BA
7
8
9
11
Adjusts undervoltage (UV) setpoint.
8
HIGH trimpot
Adjusts overvoltage (OV) setpoint.
OUT+ Terminal (KDA 24R only)
9
V+ Terminal (KDA 24A only)
Wire routed from bottom; see appropriate connection
diagram.
IN+ Terminal (KDA 24R only)
10
Wire routed from bottom; see appropriate connection
diagram.
V- Terminal
11
Wire routed from bottom; see appropriate connection
diagram.
3043505
FIGURE 1. KDA 24 SERIES COMPONENT LOCATIONS
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Page 3
24V
PS1
24V
PS2
+
+
REQUIRED
EXTERNAL
DISTRIBUTION
POINT
(SEE
NOTE 1.)
(SEE
NOTE 1)
IN+
IN+
KDA 24R
OR-ING
DIODE
HIGH
VOLTAGE
LOW
(YELLOW)
UV
MONITOR
DC OK
(GREEN)
OV
(RED)
V-
NC
NO
ALARM
RELAY
COM
OUT+
FAIL
COM
OK
OPTIONAL
EXTERNAL
DISTRIBUTION
POINT
(+)
+
CHANNEL A
LOAD
V-
(RED)
UV
(YELLOW)
LOW
OV
HIGH
VOLTAGE
MONITOR
DC OK
(GREEN)
OR-ING DIODE
CHANNEL B
ALARM
RELAY
NO
COM
NC
OK
COM
FAIL
OUT+
3043497
3043493
NOTES:
1. V- TERMINAL MUST NOT BE USED AS DISTRIBUTION POINT.
2. WIRES CONNECTED TO KDA 24-R MUST BE RATED FOR MAXIMUM CURRENT OF POWER SUPPLY.
3. WIRES CONNECTED TO LOAD MUST BE RATED FOR AT LEAST TWICE MAXIMUM CURRENT OF POWER SUPPLY.
FIGURE 2. KDA 24R, TYPICAL CONNECTION DIAGRAM
KDA 24A
CHANNEL
A
CHANNEL
B
V+
HIGH
VOLTAGE
MONITOR
LOW
OV
(RED)
UV
OV
(RED)
(YELLOW)
(YELLOW)
LOW
HIGH
UV
VOLTAGE
MONITOR
V-
V-
V+
DC OK
(GREEN)
CHANNEL A
CHANNEL B
DC OK
(GREEN)
NC
NO
ALARM
RELAY
ALARM
RELAY
NO
NC
COM
COM
FAIL
COM
OK
OK
COM
FAIL
(+)
(-)
(-)
(+)
FIGURE 3. KDA 24A TYPICAL CONNECTION DIAGRAM
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Page 4
III — SPECIFICATIONS
Specifications for each model are listed below.
TABLE 1. FEATURE SUMMARY, KDA 24 SERIES
SPECIFICATION
Reverse Voltage Protection Yes Yes
ORing (blocking) diodes No Yes
Undervoltage LED Yellow = Alarm Yellow = Alarm
Overvoltage LED Red = Alarm Red = Alarm
Input DC OK LED Green = DC OK Green = DC OK
INPUT CHARACTERISTICS:
INPUT VOLTAGE:
Nominal 24V d-c, Operating Range: 12V** to 35V d-c
** Consult factory for operation below 24V nominal.
NUMBER OF INPUTS:
Two (2): A and B
INPUT AND OUTPUT CURRENT: Per input:
30A max.
NOTE: For parallel operation of both circuits
maximum output current of each circuit
must not exceed 30A.
VOLTA G E D R O P: Input to Output
0.5V d-c typ.
REVERSE OUTPUT VOLTAGE:
45V d-c max
ALARM, INPUT VOLTAGE (UNDERVOLTAGE):
Indicators (A and B): UV LED
— Relays (A and B): isolated contacts rated at
28V d-c/1A or 115V a-c/0.5A
— Range: See Figure 5 and Table 2.
— Factory preset: See Figure 5 and Table 2.
— Hysteresis: See Figure 5 and Table 2.
ALARM, INPUT VOLTAGE (OVERVOLTAGE):
— Indicators (A and B) OV LED
— Relays (A and B): isolated contacts rated at
28V d-c/1A or 115V a-c/0.5A
— Range: See Figure 5 and Table 2.
— Hysteresis: See Figure 5 and Table 2.
— Factory preset: See Figure 5 and Table 2.
KDA 24A
Independent
KDA 24R
Parallel Redundant
ENVIRONMENTAL CHARACTERISTICS
OPERATING TEMPERATURE (35V INPUT MAX.):
KDA 24A: -10 to +60°C (all orientations)
KDA 24R: -10 to +50°C (100% load, Figure 7)
-10 to +60°C (60% load, Figure 7)
-10 to +30°C (mounting other than
shown in Figure 4.)
STORAGE TEMPERATURE: -25°C to +85°C
COOLING: Natural convection.
GENERAL CHARACTERISTICS
ISOLATION VOLTAGE:
Between input and ground: 500V.
Between output and ground: 500V.
Relay contacts are galvanically isolated.
SAFETY: All units designed to meet UL 508, UL 60950, TÜV Rheinland EN60950 and EN 60529 (category IP 20); KDA 24 units are CE marked per the Low Voltage Directive (LVD), EN60950.
CONNECTIONS: Screw terminals: M3 slotted (use cabinet tip screwdriver, flat, (0.125” [3mm] x 0.020” [0.5mm]); Wire gage: solid/stranded AWG (mm
2
): 24-12
(0.25-2.5); strip length: 5/16 in. [8mm], max torque: 5 lb.-in
[0.5Nm].
WARRANTY: One year.
WEIGHT: KDA 24A: 0.5 lbs. (0.255 kg.)
KDA 24R: 1.0 lbs. (0.454 kg.)
DIMENSIONS:
See Figure 6.
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Page 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 distribution points. See Figure 2 for connections; see Figure 1 for component locations.
KDA 24A. This model consists of two independent identical 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 locations.
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 overvoltage 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.
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.
SEE NOTE 2
3043540
FIGURE 4. RECOMMENDED MOUNTING ORIENTATION
AIR FLOW
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 guaranteed values).
KEPCO, INC. 131-38 SANFORD AVENUE FLUSHING, NY. 11355 U.S.A. TEL (718) 461-7000 FAX (718) 767-1102
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062411 228-1694 REV 4 5
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 2181185 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 necessary 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.
Page 6
VOLTAGE
V2
UVP
V4
OVP
V3
OVD
V1
UVD
V4 - OVP (OVERVOLTAGE PICK-UP)
V3 - OVD (OVERVOLTAGE DROP-OUT)
V2 - UVP (UNDERVOLTAGE PICK-UP)
V1 - UVD (UNDERVOLTAGE DROP-OUT)
DC OK LIGHT ON, RELAY ENERGIZED (OK-COM CLOSED)
DC OK LIGHT OFF, RELAY DE-ENERGIZED (FAULT-COM CLOSED)
UV LIGHT ON
UV LIGHT OFF
OVERVOLTAGE
}
HYSTERESIS
UNDERVOLTAGE
}
HYSTERESIS
3043498
FIGURE 5. DEFAULT SETTINGS FOR HIGH/LOW ALARMS SHOWING HYSTERESIS EFFECTS
TABLE 2. HIGH AND LOW ALARM ADJUSTMENT SETTINGS
VOLTAGE
CONDITION
(ADJUSTMENT POT)
UNDERVOLTAGE
(LOW)
OVERVOLTAGE
(HIGH)
* Contact factory for alarm settings outside tested max./min. range.
V2: UVP (UNDERVOLTAGE PICK-UP) 16.9V * 21.8V * 19.0V
V1: UVD (UNDERVOLTAGE DROP-OUT) 16.5V * 21.2V * 18.4V
V4: OVP (OVERVOLTAGE PICK-UP) 27.3V * 31.8V * 30.2V
V3: OVD (OVERVOLTAGE DROP-OUT) 26.5V * 31.0V * 29.4V
SETTING
(SEE FIGURE 5)
Low Alarm (Undervoltage) Adjustment. If the factory adjusted values are not acceptable, proceed as follows to adjust the low alarm pick-up and drop-off voltages (V2 and V1 of Figure 5). See Table 2 for the adjustment range
Note: Once all LOW and HIGH alarm adjustments are
acceptable, refer to “Securing Alarm Adjustments”
on page 7 to secure the adjustments
1. Connect a variable output power supply (with a range
exceeding the minimum and maximum values listed in
Table 2) to the channel input as described in the paragraph titled “Input Connections.” on page 5. Toggle
voltage points may be monitored using the visual indicators (yellow UV, green DC OK and red OV lights) or
monitoring the relay contacts.
2. Turn the LOW trimpot fully CW, then adjust the power
supply to the desired LOW threshold voltage (UVP, V2
OV LIGHT ON
OV LIGHT OFF
GUARANTEED ADJUSTMENT
RANGE
MIN MAX
FACTORY DEFAULT
VAL UES
(±2%)
shown in Figure 5). If necessary, use a DVM to monitor the power supply voltage.
3. Observe that the UV (yellow) light is lit; no other lights
are lit (relay is deenergized). Slowly (approximately
one complete turn in five seconds) turn the LOW trim
pot CCW until the toggle point (yellow UV LED goes
out, green DC OK goes on, and the relay energizes).
This is V2 - UVP (undervoltage pick-up voltage) as
indicated in Figure 5 and Table 2.
4. To verify the settings lower the voltage of the variable
power supply by about 1.2V. Observe that the yellow
UV light is lit; no other lights are lit (relay is deenergized).
5. Then slowly increase the voltage until the toggle point
occurs (yellow UV LED goes out, green DC OK light
goes on, and the relay energizes).
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Page 7
6. Verify that this toggle point is the desired value for UVP
voltage. If this voltage is not correct, proceed to step 7
for fine tuning. If this voltage is correct, slowly lower the
variable power supply voltage and verify that value of
UVD (V1, Figure 5) is adequate (Hysteresis value 0.6V
typ. see Figure 5)
7. If the toggle point is missed, fine tune as follows: Adjust
power supply voltage to the desired UVP value (Undervoltage pick-up voltage). Turn the LOW trimpot CW
about two to three turns until the system toggles back
again (yellow UV light on, DC OK light off, relay deenergized). Very slowly turn LOW trimpot CCW until the
toggle point is reached: yellow UV light goes out, green
DC OK light goes on, and the relay energizes. Reverify
again per step 6.
High Alarm (Overvoltage) Adjustment. If the factory adjusted values are not acceptable, proceed as follows to adjust the high alarm pick-up and drop-off voltages (V3 and V4 of Figure 5). See Table 2 for the adjustment range
NOTE: Once all LOW and HIGH alarm adjustments are
complete, refer to “Securing Alarm Adjustments”
on page 7 to secure the adjustments.
4. To verify the settings lower the voltage of the variable
power supply by about 2V. Observe that the green DC
OK light is lit, relay is deenergized and red OV LED is
off.
5. Slowly increase the voltage until the toggle point
occurs (red OV LED goes on, no other lights are lit and
the relay deenergizes.
6. Verify that this toggle point is the desired value for OVP
voltage. If this voltage is not correct, proceed to step 7
for fine tuning. If this voltage is correct, slowly lower the
variable power supply voltage and verify that value of
OVD (V3, Figure 5) is adequate (Hysteresis value 0.9V
typ. see Figure 5)
7. If the toggle point is missed, fine tune as follows: Adjust
power supply voltage to the desired OVP value (Overvoltage pick-up voltage). Turn the HIGH trimpot CW
about two or three turns until the system toggles back
again (green DC OK light is lit, relay is deenergized
and red OV LED is off). Very slowly turn HIGH trimpot
CCW until the toggle point is reached: red OV LED
goes on, no other lights are lit and the relay deenergizes. Reverify again per step 6.
1. Connect the variable power supply described above to
the channel input as described in the paragraph titled
“Input Connections.” on page 5. Toggle voltage points
may be monitored using the visual indicators (yellow
UV, green DC OK and red OV lights) or monitoring the
relay contacts.
2. Turn the HIGH trimpot fully CW, then adjust the power
supply to the desired HIGH threshold voltage (OVP, V4
shown in Figure 5). If necessary, use a DVM to monitor
the power supply voltage.
3. Observe that the green DC OK light is lit and relay is
deenergized. Slowly (approximately one complete turn
in five seconds) turn the HIGH trim pot CCW until the
toggle point (red OV LED goes on, no other lights are
lit and the relay deenergizes.
Securing Alarm Adjustments. Once HIGH and LOW alarm settings for both channels are acceptable, the adjustments can be covered to prevent tampering by installing four plugs (supplied) into the trimpot adjustment access holes (see Figure 7). Once these plugs have been installed, they can only be removed by first removing the KDA cover (remove two screws and slide cover off) and then releasing the plug prongs while pushing the plug out.
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062411 228-1694 REV 4 7
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Page 8
4.38
[111.4 mm]
0.78 [19.9 mm]
[117.1 mm]
3010306
4.61
0.30
[7.5 mm]
DIN RAIL
NS35/7,5
4.62
[117.4 mm]
0.03 [0.8 mm]
3.60
[91.4 mm]
FIGURE 6. KDA 24 SERIES OUTLINE DIMENSIONS
DIN RAIL
NS35/15
"G" DIN
RAIL NS32
NOTE: TO REMOVE PLUG, REMOVE TWO SCREWS AND
SLIDE KDA COVER OFF CHASSIS. THEN RELEASE
PLUG PRONGS WHILE PUSHING PLUG OUT.
PLUG ( QTY 4)
KDA COVER
3043531
SCREW (QTY 2)
P/N 101-0092
(BHPH, 4-40 x 0.312 ST NA)
P/N 108-0473
PLUG
DETAIL
PRESS
TO
RELEASE
KDA CHASSIS
FIGURE 7. SECURING ALARM ADJUSTMENTS
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8 228-1694 REV 4 062411
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