Siemens SITOP PSE200U, SITOP SEL1200, SITOP SEL1400 User manual

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SITOP power supply

Electronic protection and fast fault localization in  V DC load circuits

SITOP SEL, SEL, PSEU selectivity modules

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The SITOP selectivity modules distribute the load current across several 24 V DC load circuits and monitor them reliably for overload and short-circuit conditions. The electronics permit brief current peaks caused, for example, by high inrush currents, but isolate load circuits in the event of an extended overload. This is ensured even on highresistance lines. In such cases, miniature circuit breakers fail to trip, or trip too late, even if the power supply unit could deliver the required tripping current. The SITOP expansion modules continue to reliably supply 24 V to the load circuits not affected by an overload and can prevent a total system failure. The new SITOP SEL selectivity modules, which have more outputs, an additional tripping characteristic and detailed diagnostics, now offer even more efficient protection for your plant.

Miniature circuit breakers with high current consumption

Miniature circuit breakers are often still used for the selective protection of 24 V DC load circuits. In many cases, however, when interacting with switched-mode power supply units, they do not offer reliable protection. They require several times the rated current in order to trip within a few milliseconds. Because stabilized power supplies limit their output current electronically when there is a critical overload, the tripping current is not always guaranteed. This can cause the 24-V supply to break in and the PLC to go to Stop. Even if the power supply unit could supply the current, immediate tripping is not necessarily assured, because with this high current requirement, the line resistance can no longer be neglected. It prevents the required tripping current from flowing. Therefore fast tripping is only possible up to certain cable lengths and starting from larger cable cross-sections. In addition to the line resistance, the overall circuit design (e.g. contact resistances at terminals) must be taken into consideration when configuring miniature circuit breakers.

SITOP selectivity modules – optimized for switched-mode power supply units

The selectivity modules are specially designed to protect 24 V DC individual load circuits supplied by switched-mode power supplies. Individual setting of the tripping current allows optimum adaptation to the respective load circuit. Engineering effort is minimal since the switch-off characteristic always guarantees reliable tripping – even with high line impedances that limit the short-circuit current.

HMI

Selectivity

Power supply

As an electronic monitor, the SITOP selectivity module switches faulty 24 V DC load circuits off immediately, and continues to supply the other loads without any interruption.

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module

24 V DC

Actor/SensorPLC

G_KT01_XX_01567

SITOP PSE200U and SEL1400 – limiting characteristic offers maximum safety

In terms of the tripping characteristic, the new 8-channel SEL1400 modules behave like the tried and tested 4-channel PSE200U modules. They limit the output current to 150% of the set value, corresponding to the overload behavior of the SITOP power supplies of the Advanced and Standard product lines. This means that, even in the case of a short circuit, no overload can occur and consequently no voltage drop at the output of the power supply unit. Even when a power supply without overload reserves is used, the patented SITOP concept ensures reliable protection: The electronics continuously monitor the 24 V DC input voltage. As soon as the 24 V DC threatens to fail, the path with a higher current than the set current is disconnected immediately. All other load circuits continue to be supplied without interruption. Even loads that do not comply with the PLC standard and can only bridge a few milliseconds of undervoltage, continue to operate without any problem.

Tripping characteristics

SITOP SEL1200 – switching characteristic for standard protection

The new SEL1200 8-channel selectivity modules also allow higher, brief overload currents. The higher the current, the faster the output is shut down. It is possible that the power supply is loaded for a few milliseconds with a current significantly higher than that which is set. If the power supply unit only has limited overload reserves, it may result in a momentary drop in the 24 V supply. For loads that comply with the PLC standard, however, this is not critical. For standard applications, the SEL1200 selectivity module therefore offers very efficient protection.

For 24 V loads with a high inrush current, the switching characteristic even offers advantages, since whatever applies at shutdown also applies when switching on. High currents are not limited, but can be permitted for a short time. In addition, two outputs of the SITOP SEL1200 or 1400 selectivity modules can be connected in parallel for a 15 A rated current.

Time in

seconds

100

Normal operation

Switch-off after approx. 5 s

0.1

0.01

Current limitation to 150% for approx. 100 ms, then switching off the faulty output

SITOP SEL1400 / PSE200U characteristic: limiting

Shutdown response for current requirement per output

circuit relative to set value (I/I set value = 100%):

Power requirement: Shutdown after:

From 0 A to 100% (set value) No shutdown

From set value to 150%

Above 150%

Above set value with simultaneous collapse of supply voltage below 20 V DC

of set value Current limiting to approx.

Approx. 5 seconds

150%

for typ. 100 ms, then

shutdown Immediate shutdown

Switching SITOP SEL1200

Limiting SITOP SEL1400/PSE200U

The higher the current, the faster the trip

250% I-set200%180%150%100%

SITOP SEL1200 characteristic: switching

Shutdown response: The higher the current, the faster the

faulty output is shut down, in line with the limit load

integral i

Startup characteristics: Supports loads with high inrush current, whereby the supply voltage can drop to 15 V

G_KT01_XX_01573

Startup characteristics: Load ramp-up to 150% of set value with stable voltage supply of at least 20 V

SITOP PSE200U versions with NEC Class 2: 110%

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Advantages of all SITOP selectivity modules

• Reliable tripping regardless of cable lengths or cross-sections

• Easy configuration thanks to individual setting of maximum output current using potentiometers

• Remote reset possible from a central location

• Three-color LEDs for fast on-site fault localization

• Two possibilities for remote diagnostics: common signaling contact or single-channel signaling

• Single-channel evaluation via just one PLC digital input and function block

• Simple commissioning thanks to manual switch on/off of load circuits using reset button

• Sequential connection delay of individual 24 V DC load circuits reduces total inrush current

• Sealable transparent cover protects against maladjustment of tripping currents and sequential delay

Special features of the SITOP SEL1200/SEL1400

• SITOP SEL1200: Switching characteristic for standard re-

quirements compliant with PLC standard

• SITOP SEL1400: Limiting characteristic for highest

demands on the 24 V protection

• Eight load circuits per module, with adjustable output

current range of 2

... 10 A

• Two outputs, switchable in parallel (for max. 15 A)

• Slim design matching that of the SITOP PSU6200

• Single-channel diagnostics via free SIMATIC S7 blocks

with extensive evaluations per output: Actual current, current threshold, reason of the automatic shutdown

• Push-in terminals

Special features of the SITOP PSE200U

• Limiting characteristic for highest demands on the 24 V

protection

• Four load circuits per module, with adjustable output

current range of 0.5

• Versions with power limitation of the outputs to 100 VA

according to NEC Class 2

• Stepped design corresponding to low-voltage

switchgear, e.g. miniature circuit breakers

• Evaluation of individual channels via free of charge

SIMATIC S7 or SIMOTION function blocks or LOGO! software

• Library for visualization in SIMATIC PCS 7

• Voltage measuring points for output currents

• Screw terminals

SITOP selectivity modules – all connections, functions and options at a glance

SITOP SEL1200/SEL1400

selectivity modules

Device identification label (not included in scope of delivery)

Eight outputs with switching (SEL1200) or limiting characteristic (SEL1400)

COM settings: 0: Common signaling 1: Single-channel diagnostics TD1/TD2: Switch-on delay, load-optimized, + 25, + 200 or + 500 ms

Data matrix code

Common signaling contact or single-channel signaling or diagnostics

Remote reset (24 V signal)

Three-color status LED per output:

Green: connected

Orange: manually disconnected

Red: disconnected due

to overload Pushbutton for On/Off/Reset for

each output

Potentiometer for setting the tripping current

0 V supply (only for the electronics, not for the outputs)

24 V DC supply

Sealable transparent cover

... 3 A or 3 ... 10 A

SITOP PSE200U

selectivity module

Four outputs with limiting characteristic

Measuring points for output current by means of voltage:

1V≙1A

Setting Switch-on delay set to 0, 25, 100 ms or load-optimized

Labeling field per output

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Sequential switching on reduces burden on the power supply

By switching on the outputs sequentially, the inrush current that the power supply has to provide is considerably reduced. This avoids the danger of a voltage dip which could result in disturbances within the plant. A power supply with a lower rated output current can possibly also be used. The "loadoptimized" setting means that the next output is not connected until the previous output current is below the set value. This is a standard response for SITOP SEL, with cumulative delay time; for PSE200U it can be set as an option.

Fast, channel-exact diagnostics

The single-channel signaling of the PSE200U and the single-channel diagnostics of the SEL1200/1400 are efficient status signals to the PLC via only one digital input. A serial code is evaluated via a free-of-charge SIMATIC S7 function block. SITOP PSU200U reports the status of the outputs via 4 channel bits, each of which are separated by a pause bit:

2750 ms

Max. total current without sequential switching on

Max. total current with sequential switching on

Output current

Activation Output 1 Output 2 Output 3 Output 4

Total current without sequential switching on Total current current with sequential switching on Output current of the outputs

Time t

G_KT01_XX_01574

SITOP PSE200U: Current measurement with voltmeter

The SITOP PSE200U selectivity module has a measuring point (MP) for each output, via which the current value at any moment is output. Because one volt corresponds to one ampere, simple voltage measurement is possible for determining the current without having to disconnect the cable. The 24 V supply to the load circuit is not interrupted and the plant remains fully operational.

Signal output

OUT 1 OUT 2 OUT 3 OUT 4

SITOP PSE200U

Start sign

1011

1 digital input

In addition, SITOP SEL1200 and SEL1400 offer extensive evaluation options:

• Output current from each of the 8 outputs

• Set current threshold

• Reason for automatic disconnection:

– Overload up to 150% for more than 5 s – Overload in excess of 150% total current (> 63 A, > 30 s) – Overcurrent (I > I setting) and undervoltage (< 20 V) – Input voltage too low (< 15 V) / too high (> 30 V) – Overtemperature

• SITOP SEL type: manufacturing date, article number

The values are encrypted in a telegram with 32 bits that are transmitted as Manchester code:

3450 ms

1000

Bit 1Bit 2Bit 3Bit 31Bit

...

1 digital input

SEL1200/

Signal output

SITOP

1400

Start sign

By means of WinCC faceplates the states and values of each output of the SITOP SEL1200 or SEL1400 can be easily visualized:

G_KT01_XX_01571

G_KT01_XX_01572

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Technical specifications

SITOP SEL1200 SITOP SEL1400

Article number

6EP4438-7FB00-3DX0 6EP4438-7EB00-3DX0

... with NEC Class 2

Input

Rated voltage V

in rated

24 V DC

Voltage range 22 ... 30 V DC

Input current Max. 63 A

Output

Rated voltage V

Typ. Uin – 0.2 V

out rated

Number of outputs 8 8

Rated current I per output

up to +60 °C

out rated

10 A 10 A

Setting range per output 2 ... 10 A 2 ... 10 A

Tripping characteristic Switching – for standard protection devices Current-limiting – for increased requirements

regarding protection

Set time delay Load-optimized (as soon as the previous output is less than the set rated value again),

+ 25 ms, + 200 ms, + 500 ms

Efficiency at V

out rated

, I

Typ. 97%

out rated

Protection and monitoring

Status displays Three-color LED per output:

green – connected, yellow – manually disconnected, red – disconnected due to overload

Signal output Diagnostics interface for common signaling or single-channel diagnostics.

Evaluation of the single-channel diagnostics via SIMATIC S7 function block

Diagnostics Common signaling: Disconnection of at least one output

Single-channel diagnostics: Current, set current threshold, status (on/off), where applicable, reason for disconnection per output

Protection class Class III

Degree of protection (EN 60 529) IP20

Certifications CE, UL, cURus, CB, cCSAus Class I Div 2; available soon: IECEx, GL, ABS, ATEX

Connections

Input +24 V

2 push-in for 0.5 ... 16 mm

(load and electronics supply)

Input 0 V (electronics supply) 2 push-in for 0.5 ... 4 mm

Outputs 1 push-in each for 0.5 ... 4 mm

Signal output 2 push-in for 0.5 ... 1.5 mm

Remote reset 1 push-in for 0.5 ... 1.5 mm

General data

Emitted interference EN 61000-6-3, EN 55022 Class B

Noise immunity EN 61000-6-2

Ambient temperature range -25 ... +60 °C (-25 ... +85 °C transport/storage)

Mounting DIN rail EN 60715 35 x 7.5/15

Dimensions

45 x 135 x 125 45 x 135 x 125

(width × height × depth) in mm

Weight Approx. 300 g Approx. 440 g

Accessories Reference identification labels 15 mm × 10 mm, 160 units. Article No.: 6ES7193-6LF30-0AW0

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Technical specifications

SITOP PSE200U with common signaling contact SITOP PSE200U with single-channel signaling

Article number ... with NEC Class 2

6EP1961-2BA11 6EP1961-2BA51

6EP1961-2BA21 6EP1961-2BA31

6EP1961-2BA61

6EP1961-2BA41

Input

Rated voltage V

in rated

24 V DC

Voltage range 22 ... 30 V DC

Input current 40 A max.

Output

Rated voltage V

Number of outputs 4 4 4

Rated current I per output

Typ. Uin – 0.2 V

out rated

up to +60 °C

out rated

3 A 10 A 3 A 10 A

Setting range per output 0.5 ... 3 A 3 ... 10 A 0.5 ... 3 A 3 ... 10 A

Tripping characteristic Current-limiting – for increased requirements regarding protection

Set time delay 0 ms, 25 ms or 100 ms (identical between outputs) or load-optimized

(as soon as the previous output is less than the set rated value)

, I

Efficiency at V

out rated

97% 99% 97% 99%

out rated

Protection and monitoring

Status displays Three-color LED per output: green for output connected, yellow for output manually disconnected,

red for output disconnected due to overload/short-circuit

Signal output Common signaling contact, changeover contact,

contact rating 24 V/0.5 A

Single-channel signaling: cyclic signaling for channel-specific evaluation using SIMATIC S7 function block

Diagnostics Disconnection of at least one output.

The current per output can be measured via voltage

measuringpoints(1V≙1A)

Status (on/off) of each of the 4 outputs. The current per output can be measured via voltage

measuringpoints(1V≙1A)

Protection class Class III

Degree of protection (EN 60 529) IP20

Certifications UR (UL 2367), cURus (UL 508, CSA C22.2 No. 107.1) cCSAus (Class I Div 2), ATEX (EN 60079-0, -15), GL, ABS,

6EP1961-2BA51/6EP1961-2BA61: NEC Class 2

Connections

Input +24 V

2 screw terminals for 0.5 ... 10 mm

(load and electronics supply)

Input 0 V (electronics supply) 2 screw terminals for 0.5 ... 4 mm

Outputs 1 to 4 1 screw terminal each for 0.5 ... 4 mm

Signal output 3 screw terminals for 0.5 ... 4 mm

Remote reset 1 screw terminal for 0.5 ... 4 mm

1 screw terminal for 0.5 ... 4 mm

General data

Emitted interference EN 61000-6-3, EN 55022 Class B

Noise immunity EN 61000-6-2

Ambient temperature range 0 ... +60 °C (-25 ... +85 °C transport/storage)

Mounting DIN rail EN 60715 35 x 7.5/15

Dimensions

72 × 80 × 72 72 × 80 × 72 72 × 80 × 72 72 × 80 × 72

(width × height × depth) in mm

Weight Approx. 170 g Approx. 220 g Approx. 170 g

Approx. 220 g

Accessories Device identification label 20 mm x 7 mm, 340 units Article No.: 3RT1900-1SB20

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Get more information:

Siemens SITOP PSE200U, SITOP SEL1200, SITOP SEL1400 User manual

Specifications and Main Features

Frequently Asked Questions

User Manual