POWER SUPPLY
REDUNDANCY
BUFFER MODULE
PS-RDN20
$
70
lSuitable for Redundant Operation
of 24 Vdc System
lAlarm Output Relays
lLED Indicator for Input
Failure Alarm
DRTB-RAIL-3575,
DIN rail, sold
separately, $7, visit
omega.com/drtb-rail
The PS-RDN20 is a 20A redundancy
(buffering) module for a 24 Vdc power
system. Containing 2 sets of 20A OR-ing
diodes, the PS-RDN20 gives you a new
option for safe connection of 1+1 redundant
power supplies. Not only does it provide the
buffering and decoupling for redundant
power supplies, the PS-RDN20 also provides
alarm signals for both input channels
through the built-in alarm relays. Now you
can replace a failed power supply without
interruption to your control system.
SPECIFICATIONS
OUTPUT
Reverse Voltage (Max): 30V
Output Current (Max): 20A
Voltage Drop: 0.5V
INPUT
Input Voltage Range: 21 to 28 Vdc
Number of Inputs: Two
Input Current (Max): 20A per input
FUNCTION
Input Voltage Alarm: When input is
<20V (±5%) or >30V (±5%), relay
contacts close
Relay Contact Rating (Max):
30 Vdc, 1A
PS-RDN20, $70,
shown actual size.
ENVIRONMENT
Working Temperature: -20 to 70°C
(-4 to 158ºF)
Working Humidity: 20 to 90% RH
non-condensing
Storage Temperature, Humidity:
-40 to 85°C (-40 to 185ºF),
10 to 95% RH
Vibration: 10 to 500 Hz, 2G 10 min/
1 cycle, period for 60 min each along
X, Y, Z axes
Mounting: Compliance to IEC60068-2-6
SAFETY and EMC
Withstand Voltage:
Terminal-Chassis: 0.5 K Vac,
Relay Contacts-Terminal: 0.5 K Vac
M-1
Isolation Resistance:
Terminal-Chassis: >100M Ω/500 Vdc
25°C (77ºF) 70% RH
EMI Conduction and Radiation:
Compliance to EN55022 (CISPR22)
Class B
EMS Immunity: Compliance to
EN61000-4-2, 3, 4, 5, 6, 8, ENV50204,
heavy industry level, Criteria A
MTBF: 996.8 Khrs min MIL-HDBK-217F
[25ºC (77ºF)]
Dimensions:
55.5 W x 125.2 H x 100 mm D
(2.18 x 4.93 x 3.94")
Weight: 0.5 kg (1.1 lb)
Pin Assignment
1 Vout+
2 Vout-
3, 4 Vin-
5 Vin B+
6 Vin A+
Pin Assignment
1 Alarm B1
2 Alarm B2
3 Alarm A1
4 Alarm A2
Terminal Pin. No Assignment (TB1)
Terminal Pin. No Assignment (TB2)
100
(3.94)
125.2 (4.93)
55.5
(2.18)
35
(1.38)
Permissable DIN rail, 35 x 7.5 or 35 x 15
1
2
3
4
5
6
1
2
3
4
TB1 TB2
LED
.. .. .. .. .. .. ..
PSU
PSU PSU
PSU
PSU PSU
1+N Redundancy using more PSU’s as the redundant units to increase the reliability
Vin A
Vout
Vout
Load
Vout
Vin A
Vin A
Vin B
Vin B Vin B
1+1 Redundancy
using 1 more PSU
as the redundant unit
PSU
PSU
Vout
Load
+
+
Vout+
Alarm B
Ala rm A
Vin/Vout-
Vin B+
Vin A+
RELAY
B
RELAY
A
Block Diagram
DIMENSIONS
Dimensions: mm (in)
APPLICATIONS
To Order (Specify Model Number)
MODEL NO. PRICE DESCRIPTION
PS-RDN20 $70 Power supply redundancy module
Ordering Example: PS-RDN20, power supply redundancy module, $70.
POWER SUPPLIES
MODEL NO. PRICE DESCRIPTION
DR-75-24 $144 DIN rail power supply, 24 Vdc, 3.125A
DR-120-24 168 DIN rail power supply, 24 Vdc, 5A
DR-240-24 229 DIN rail power supply, 24 Vdc, 10A
Note: Power supplies sold separately.
Ordering Example: PS-RDN20, power supply module and DR-75-24, 2 DIN rail power supplies, $144 (2) + 70 = $358.
M-2
AVAILABLE FOR FAST DELIVERY!
One Omega Drive | Stamford, CT 06907 | 1-888-TC-OMEGA (1-888-826-6342) | info@omega.com
EPG05
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