3UG3501 datasheet(97/114 Pages) ETC2

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Monitoring Relays

7/97

Siemens LV 1 T · 2006

3RN1 Thermistor Motor Protection

For PTC sensors

Cable routing

Maximum cable length for sensor circuit cables

1) A short-circuit in the sensor circuit will be detected up to this maximum

cable length.

Notes:

Tripping of the thermistor protection relay even in combination

with a converter must directly result in disconnection. This must

be implemented with circuitry.

Mounting and installation must only be performed by qualified

personnel who observe the applicable regulations! For

mounting, use installation manual No.: 3ZX1012-0RN10-1AA1.

The 3RN10 is not intended for installation in hazardous areas.

For installation in areas subject to explosion hazards, the 3RN10

must be enclosed in a flameproof casing.

For tripping units with a 24 V AC/DC control voltage, electrical

isolation must be secured with a battery network or a safety

transformer according to DIN VDE 0551.

When tripping units with Auto-RESET function are used, a reset

is performed automatically after the cooling time has expired. It

must be ensured by means of an external interlock (latching with

a separate On and Off button) that the machine to be monitored

does not start up again spontaneously.

Units with the Auto-RESET function must not be used in

applications in which the unexpected restart can lead to

personal injury or property damage.

In the case of tripping units without short-circuit detection,

during commissioning or after modifications or maintenance

work (assembly, disassembly) on the equipment, the sensor

resistance must be measured using a suitable measuring

instrument. For resistances < 50 Ohm, the sensor circuit must

be checked for a short-circuit.

If 3RN10 00 units are used to protect EEx e motors, separate

monitoring of the control voltage is recommended because there

is no Ready LED to indicate connection to the supply voltage.

If 3RN10 13-.BW01 units are used to protect EEx e motors,

separate monitoring of the control voltage is recommended

because the switching status of the auxiliary contacts does not

change if the control voltage fails (use of a bistable relay is

recommended).

Before commissioning, the effectiveness of the protection

function must be checked.

■Function

The 3RN1 tripping units operate in accordance with the closed-

circuit principle and therefore monitor themselves for open-

circuit (except: warning output in the case of 3RN10 22).

A momentary power failure of less than 50 ms does not change

the status of the auxiliary contacts. The 3RN10 11, 3RN10 12

and 3RN10 13 units with 2 changeover contacts are also

equipped with short-circuit detection in the sensor circuit. The

unit will trip in the event of a short-circuit in the sensor circuit

(resistance in sensor circuit < 20

W).

All tripping units (except for 24 V AC/DC ) feature electrical

isolation between the control circuit and the sensor circuit.

3RN10 00 compact tripping units

The compact tripping unit is equipped with a red LED (TRIPPED)

for the tripped display and a changeover contact.

After the unit has tripped, it is automatically reset once the

thermistors have cooled down. The root of the changeover

contact is connected to the control voltage (95 is connected to

terminal A1).

This unit is particularly suitable in circuits in which the control

circuit and signaling circuit have the same potential, e.g. in local

control boxes.

3RN10 10, 3RN10 11, 3RN10 12, 3RN10 13 standard tripping

units

The standard units are equipped with two LEDs (READY and

TRIPPED) for an operating and tripped display and are available

with either 1 NO + 1 NC or with 2 CO contacts. They are available

depending on the version with automatic RESET (3RN10 10),

manual/remote RESET (3RN10 11) or manual/automatic and

remote RESET (3RN10 12 and 3RN10 13). Remote RESET can

be achieved by connecting an external pushbutton with a

normally-open function to terminals Y1 and Y2. If terminals Y1

and Y2 are bridged, tripping will be followed by an automatic

RESET.

The 3RN10 11, 3RN10 12 and 3RN10 13 units with 2 COs also

have short-circuit monitoring in the sensor circuit.

The 3RN10 12 and the 3RN10 13 are non-volatile. This means

that even if the control voltage fails, a preceding trip will be

latched.

In the case of the 3RN10 13 tripping unit, tripping due to a short-

circuit in the sensor circuit will be indicated by a flashing red

LED. The monostable version also indicates open-circuit in the

sensor circuit by flashing of the red LED.

3RN10 22 "Warning and disconnection" tripping units

Two sensor circuits can be connected to one 3RN10 22 tripping

unit that acts on one output relay with 1 NO contact for warning

and 1 CO for disconnection. Temperature sensors with different

rated response temperatures TNF are used to implement the

"Warning" and "Disconnection" functions. When the "Warning"

sensor circuit responds, a yellow LED is lit and when the

"Disconnection" circuit responds, a red LED is lit.

The sensor circuits have a different reset response and

operating behavior:

• "Warning" (terminals 2T1, T2) only features automatic RESET

and uses the open-circuit principle.

• "Disconnection" (terminals 1T1, T2) can be changed from

manual RESET to automatic RESET by linking terminals Y1

and Y2. Remote RESET is implemented by connecting an

external pushbutton with a normally-open function.

Conductor cross-

section in mm2

Cable length in m for tripping units

Without short-circuit

detection

3RN10 00, 3RN10 10

3RN10 11-.C

3RN10 12-.C

3RN10 22, 3RN10 62

With short-circuit

detection1)

3RN10 11-.B/-.G

3RN10 12-.B/-.G

3RN10 13

2.5

2 x 2800

2 x 250

1.5

2 x 1500

2 x 150

0.5

2 x 500

2 x 50

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