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Les langues disponibles
Characteristic
I (A)
4
3
2
1
0
-20
0
+20
+40
Continuous current limit curve
Application Examples
L
N
A1
P1
3 or 6
M
+
P2
X1
RESET
Zone EX
Thermistor motor protection relay shown as variant MK 9003/_1_ _ _ ,
with safe separation according to EN 61 140, EN 60 947-1, 6 kV/2
between:
- Auxiliary voltage and measuring circuit
- Auxiliary voltage and output contacts
- Measuring circuit and output contacts
- the 2 changeover contacts (only with 2 changeover contacts)
Note: See also Installation
Production Date
Every unit is labelled with the production date e.g. "Bj. KW 49/02".
The device was produced in week 49, 2002.
E. Dold & Söhne GmbH & Co. KG • D-78120 Furtwangen
dold-relays@dold.com • www.dold.com
T (°C)
+60
M6412_a
M12573
A2
11
12
11
21
14
21
12
14
22
24
22
24
X2
AC 230V 4A
DC 24V 4A
A1/A2
AC50/60Hz 230V 1,5VA
Not zone EX
Additional Information
Use on motors in explosion hazardous areas
Thermal protection on motors that are equipped with PTC sensors
according to DIN VDE V 0898-1-401 or EN 60034-11 type A
(EN 60947-8) .In applications with motors of the explosion protection class
Ex e and Ex d only the sensor with it's connection wire leads into the Ex
area. The motor proteciton relay has to be mounted outside the Ex-area,
but monitors devices operated in the Ex-area.
Safety integrity level SIL 1
To fulfil SIL 1 a cyclic function test of the protection device has to be provided.
This can be done manually during manintenance (see below).
The function test must be carried out all 2 years.
Test facilities for set-up and manintenance
A test of the unit can be made by simulating the resistance oon the sonsor
input. During maintenance these tests can also be made.
- Test of short circuit detection:
- Test of broken wire detection:
- Test of overtemperature function:
The RESET button can also be used for test purpose (see Function Diagram)
Installation
The DC 24 V version has no galvianic separation between auxiliary supply
(A1, A2) and the sensor circuit (P
connected to transformers according to EN 61 558 or to battery supply.
Wiring
The sensor and control wires have to be installed separately from the motor
wires. When strong inductive or capacitve influence is expected from parallel
installed high courrent wires, screened wire should be used.
Wire length
The max. wire length of the sensor circuit is:
Diameter (mm
):
2
max. wire length (m):
Troubleshooting
Failure
Device cannot be activated
Maintenance and repairs
- The device contains no parts that require maintenance.
- In case of failure, do not open the device but send it to manufacturer
for repair.
•
Bregstraße 18 • Phone +49 7723 654-0 • Fax +49 7723 654356
16
Bridge sensor input (this test is
possible without dis con nection
of the sensor).
Disconnect sensor wire.
Change restistance on input
from low 50 ... 1500 Ω to
4 kΩ.
, P
). These units are only allowed to be
1
2
4
2.5
1.5
2 x 550
2 x 250
2 x 150
Potential cause
- Power supply not connected
- Unit defective
MK 9003-ATEX / 30.09.21 en / 452A
0.5
2 x 50
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