3UG4622-1AW30 Datasheet, PDF (97/114 Pages) List of Unclassifed Manufacturers – Monitoring and Control Devices

Monitoring Relays
3RN1 Thermistor Motor Protection
For PTC sensors
Cable routing
Maximum cable length for sensor circuit cables
Conductor cross-
section in mm²
2.5
1.5
0.5
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
2 x 2800
2 x 1500
2 x 500
With short-circuit
detection¹⁾
3RN10 11-.B/-.G
3RN10 12-.B/-.G
3RN10 13
2 x 250
2 x 150
2 x 50
■ 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.
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.
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.
Siemens LV 1 T · 2006
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