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2.3 Sensor circuit wiring
NOTICE
The lines in the measuring circuit must be laid as separate control
lines. The use of motor feeder lines or other main power lines is
not permissible. Shielded control cables must be used if extreme
inductive or capacitive interferences from high tension cables
running in parallel are to be expected.
2.4 Sensor circuit short-circuit detection
NOTICE
To ensure reliable functioning of the short-circuit protection, the
line resistance in the thermistor circuit (when the thermistor is
short-circuited) must not exceed 10 Ω!
This corresponds to the following typical cable lengths:
Cable cross section
Cable lengths at the thermistor input
2
2,5 mm
2
1,5 mm
2
0,5 mm
2.5 Short-circuit protection according to EN 60947-4-1 for
type of coordination 2
The short-circuit protection must be adopted from the separate over-
current protection devices.
NOTICE
In combination with other contactors please observe the respec-
tive maximum contactor protection for type of coordination 2.
2.6 Cable protection
NOTICE
Excessive surface temperatures of the cables and lines must be
prevented by dimensioning the cross sections accordingly.
An adequate cable cross section must be chosen for heavy
starting - CLASS20 and CLASS30 - in particular.
2.7 Automatic RESET
CAUTION
!
When the 3RB22 / 3RB24 is in the "Automatic RESET" mode, the
reset is carried out automatically at the end of the cooling time
without the RESET button being pressed. In this case, an
additional ON button is necessary to prevent the motor from
automatically starting up again after being tripped. If, in this case,
the 3RB22 / 3RB24 is used without thermistor protection, the
motor can only be connected by a specialist.
The "Automatic RESET" mode may not be used in applications in
which an unexpected motor restart could lead to personal injury or
damage to property.
2.8 User test
The tests according to EN 60079-17 can be carried out together with
the user test. This test includes a complete functional test. All four test
phases must be carried out as described in the following table. The
individual test phases include the LED test (1), the configuration test
(2), the internal test with current measurement (3) and the relay test
(4). The measured current values must be checked!
The measured current values and the correct opening and closing of
the relay contacts (test phase 4) must be checked!
CAUTION
!
This test must be carried out by a specialist familiar with the
standards stated!
3ZX1012-0RB22-1CA1
2 x 250 m
2 x 150 m
2 x 50 m
All protective functions remain activated during the test. A tripping
operation or a warning results in abortion of the test!
To start the test, press the TEST / RESET button for t > 1 s.
Test
Durati
Description
phase
on
1
3 s
LED test
The user checks whether all LEDs are flashing
2
3 s
Configuration
Flickering LEDs indicate that the respective
test
functions are activated. The user checks the
active functions
LED
3RB22: READY
3RB24: Device/
IO-Link
GND-Fault
THERMISTOR
OVL
3
18 s
Internal test
The system is executing internal tests. The
analog output is permanently activated
throughout the test period. The user must
compare the maximum motor current of the 3
phases with the current at the analog output.
The following must apply:
• the effective current must be between 30% and
125% of the nominal current
• the maximum motor current leads to an "ideal"
analog current I
• the actual measured analog current
I
0.9 * I
• Correct functioning cannot be guaranteed
if the measured current does not fall within
these tolerances.
The LEDs show the running time (see the
following graphic).
4
Relay test
3RB22: The system must switch off outputs 95 /
*)
96 and 05 / 06.
3RB24: The system must switch off outputs 95 /
96 and 95/ 98.
Correct functioning cannot be guaranteed
if the output contacts do not open!
*) When the three red LEDs flicker, relay switch-off has been initiated.
Up to this point in time, it is possible to abort the user test without
switching off the relays.
The following graphic shows an overview of the temporal course:
TEST /
RESET
LED test
Configuration test
Internal tests
Relay test
Test phase
1
2
0
3
6
Comment
Function
Automatic reset active
Ground fault evaluation
Thermistor activated
Overload warning active
of
Analog,target
must be within the range
Analog, actual
≤ I
≤ 1.1 * I
Analog,target
Analog,actual
3
4
9
12
12
15
18
21
24
Analog,target
5
t [s]
5
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