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Redundancy

Redundancy

Overview

The SITOP redundancy modules are the optimal extension for all 24 V power supplies to ensure additional protection from failure of the 24 V supply. The redundancy module continuously monitors the power supply units and, in the event that one unit fails, the other unit automatically takes over the 24 V power supply. With the SITOP PSE202U redundancy modules, a signal is additionally sent via a signaling contact that can then easily be evaluated by a controller, PC, or control system. With the SITOP RED1200 redundancy modules, this message can be implemented in the form of a missing signal from the defective power supply.

Benefits

  • High availability of the 24 V supply thanks to redundant configuration
  • Power is reliably supplied even when a power supply fails
  • Compact redundancy modules for power supplies up to 40 A
  • Redundancy module 24 V/NEC Class 2 with limiting to 100 VA
  • Diagnostics messages via LED and signaling contacts with SITOP PSE202U
  • Adjustable switching threshold for LED and signaling contacts with SITOP PSE202U

Application

The redundancy module decouples two 24 V power supplies of the same type so that the loads are still supplied by the second power supply (1 + 1 redundancy) in case one of the two power supplies fails.

Redundancy modules support parallel switching of power supplies of the same type to increase performance while offering redundancy at the same time (N + 1 redundancy).

You can use the NEC Class 2 redundancy module to implement a redundant 24 V supply limited to an output power of 100 VA.

Design

For redundant configuration of a 24 V supply, the redundancy module decouples two SITOP 24 V power supplies of the same type by means of diodes in parallel operation. Depending on the output current of the power supplies, 1 to 2 redundancy modules may be required.

Function

Monitoring

The redundancy module continuously monitors the output voltage of the connected power supplies. The switching threshold of 20 to 25 V can be set on the device. A signal indicates if the output voltage of one of the two power supplies sinks to the set value or below.

SITOP PSE202U redundancy module signaling

The LED on the device and a changeover contact signal a faulty power supply.

The signal evaluation of the PSE202U is also represented in our library for SIMATIC PCS 7. Download:
https://support.industry.siemens.com/cs/ww/en/view/109476154

Technical specifications

Article number 6EP4346-7RB00-0AX0 6EP4347-7RB00-0AX0 6EP1962-2BA00 6EP1964-2BA00 6EP1961-3BA21
Product RED1200 2x10A RED1200 2x20A SITOP PSE202U SITOP PSE202U SITOP PSE202U
Input
Input DC voltage DC voltage DC voltage DC voltage DC voltage
Supply voltage
● at DC 12 … 48 V 12 … 48 V 24 … 24 V 24 … 24 V 24 … 24 V
Input voltage
● at DC 10 … 58 V 10 … 58 V 19 … 29 V 19 … 29 V 24 … 28.8 V
Output
Output Controlled DC voltage Controlled DC voltage Controlled, isolated DC voltage Controlled, isolated DC voltage Controlled, isolated DC voltage
Number of outputs 1 1
Rated voltage Vout DC 24 V 24 V 24 V 24 V 24 V
Output voltage Vin – approx. 0.6 V Vin – approx. 0.6 V Vin – approx. 0.5 V Vin – approx. 0.5 V Vin – approx. 0.5 V
Product function Output voltage adjustable No No No No No
Status display Green LED for “both input voltages > switching threshold”; red LED for “at least one input voltage < switching threshold” or “output switched off” Green LED for “both Input voltages > switching threshold”; red LED: for “at least one input voltage < switching threshold” Green LED for “both Input voltages > switching threshold”; red LED: for “at least one input voltage < switching threshold”
Signaling Isolated relay contact (contact rating 6 A/42 V AC, 30 V DC, but max. 100 VA): Contact closed if one or both input voltages < switching threshold or output is switched off. Setting range of switching threshold 20 V ±0.5 V to 25 V ±0.5 V Isolated relay contact (contact rating 6 A/42 V AC, 30 V DC): Contact closed if both input voltages > switching threshold, setting range of switching threshold 20 V ± 0.5V to 25 V ± 0.5V Isolated relay contact (changeover contacts, rating 8 A/240 V AC, 24 V DC): Signals OK if both input voltages > switching threshold, setting range of threshold 20 … 25 V
Rated current value Iout rated 20 A 40 A 3.8 A 10 A 40 A
Current range 4.6 A 10 A 40 A
● Note Maximum aggregate current in the event of an error according to NEC class 2 limit 8 A max. aggregate current 10 A max. aggregate current 40 A; +60 … +70 °C: derating 3%/K
Efficiency
Efficiency at Vout rated, Iout rated, approx. 97.5 % 97.5 % 94.8 % 97.1 % 96.6 %
Power loss at Vout rated, Iout rated, approx. 12 W 25 W 5 W 3.6 W 34 W
Power loss [W] during no-load operation maximum 0.1 W 0.1 W 2 W 1 W 1.5 W
Safety
Primary/secondary isolation No No
Galvanic isolation yes, SELV acc. to EN 60950-1 (relay contact) yes, SELV acc. to EN 60950-1 (relay contact) yes, SELV acc. to EN 60950-1 (relay contact)
Protection class Class III Class III Class III Class III Class III
CE mark Yes Yes Yes Yes Yes
UL/cUL (CSA) approval cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259 cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259 cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259; UL-Recognized (UL 60950-1, NEC class 2), File E151273 cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259 cULus-Listed (UL 508, CSA C22.2 No. 107.1), File E197259
Explosion protection IECEx Ex nA nC IIC T4 Gc; ATEX (EX) II 3G Ex nAC IIC T4; cCSAus (CSA C22.2 No. 213, ANSI/ISA-12.12.01) Class I, Div. 2, Group ABCD, T4
FM approval
CB approval No No No
Marine approval ABS, DNV GL
Degree of protection (EN 60529) IP20 IP20 IP20 IP20 IP20
EMC
Emitted interference EN 61000-6-3 EN 61000-6-3 EN 55022 Class B EN 55022 Class B EN 55022 Class B
Noise immunity EN 61000-6-2 EN 61000-6-2 EN 61000-6-2 EN 61000-6-2 EN 61000-6-2
Operating data
Ambient temperature
● during operation -25 … +70 °C -25 … +70 °C -20 … +70 °C -20 … +70 °C -25 … +60 °C
— Note with natural convection with natural convection with natural convection with natural convection with natural convection
● during transport -40 … +85 °C -40 … +85 °C -40 … +85 °C -40 … +85 °C -40 … +85 °C
● during storage -40 … +85 °C -40 … +85 °C -40 … +85 °C -40 … +85 °C -40 … +85 °C
Humidity class according to EN 60721 Climate class 3K3, 5 … 95% no condensation Climate class 3K3, 5 … 95% no condensation Climate class 3K3, 5 … 95% no condensation Climate class 3K3, 5 … 95% no condensation Climate class 3K3, 5 … 95% no condensation
Mechanics
Connection technology Push-in terminals Push-in terminals screw-type terminals screw-type terminals screw-type terminals
Connections
● Supply input In1, In2: je 0.5 … 6 mm² In1, In2: je 0.5 … 16 mm² Input, output and ground: removable screw terminal, each 1 x 0.5 … 2.5 mm² single-core/finely stranded Input, output and ground: removable screw terminal, each 1 x 0.5 … 2.5 mm² single-core/finely stranded Input, output and ground: 1 screw terminal each for 0.33 … 10 mm² single-core/finely stranded
● Output Out1: 0.5 … 6 mm² Out1: 0.5 … 16 mm²
● Auxiliary Relay contact: 2 screw terminals for 0.5 … 2.5 mm² single-core/finely stranded Relay contact: 2 screw terminals for 0.5 … 2.5 mm² single-core/finely stranded Relay contact: 3 screw terminals for 0.5 … 2.5 mm² single-core/finely stranded
Width of the enclosure 35 mm 45 mm 30 mm 30 mm 70 mm
Height of the enclosure 135 mm 135 mm 80 mm 80 mm 125 mm
Depth of the enclosure 125 mm 125 mm 100 mm 100 mm 120 mm
Required spacing
● top 45 mm 45 mm 50 mm 50 mm 50 mm
● bottom 45 mm 45 mm 50 mm 50 mm 50 mm
● left 0 mm 0 mm 0 mm 0 mm 0 mm
● right 0 mm 0 mm 0 mm 0 mm 0 mm
Weight, approx. 0.47 kg 0.51 kg 0.125 kg 0.125 kg 0.5 kg
Product feature of the enclosure housing for side-by-side mounting Yes Yes Yes Yes Yes
Installation Snaps onto DIN rail EN 60715 35×7.5/15 Snaps onto DIN rail EN 60715 35×7.5/15 Snaps onto DIN rail EN 60715 35×7.5/15 Snaps onto DIN rail EN 60715 35×7.5/15 Snaps onto DIN rail EN 60715 35×7.5/15
Electrical accessories Removable spring-type terminal 6EP1971-5BA00 Removable spring-type terminal 6EP1971-5BA00
MTBF at 40 °C 8 100 000 h 6 100 000 h 678 210 h 3 273 000 h 6 471 654 h
Other information Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified) Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified) Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified) Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified) Specifications at rated input voltage and ambient temperature +25 °C (unless otherwise specified)

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