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Datasheet
MC6
Current Limiter
for 2 Wire Transmitters
(loop powered)
The MC6-Current Limiter is designed to install in 420mA loops and prevent short circuits from causing a
power supply to turn off. In the event of a short circuit
the maximum current draw from the power supply is
24mA. Thus a short in one loop will not cause the
power supply to turn off and shut down a complete
system.
Although preventing the power supply from shutting
down is desirable it is also important to know there is a
fault. For this the MC6-Current Limiter provides a
digital output to indicate it is in current limiting mode.
When the short is corrected the module automatically
reverts to normal operation.
The voltage drop across the device is just 2.5V max. so
the effect on the complete loop is minimal. Mounting is
on either 32mm or 35mm DIN rails. The compact
package requires just 8mm of rail space (9.5mm with an
end plate).
Suitable for use with two wire transmitters.
Shown with optional End Plate
A version specifically for use in Fieldbus Foundation
networks is also available.
Features:
• limits loop current to 24mA maximum, even when
there is a direct short to ground.
• digital output to indicate short
• requires just 8mm of rail space
• CSA Class 1, Division 2 approved
Canada
Weidmuller, S.A. de C.V.
United States Weidmuller Inc.
Weidmuller Ltd.
Ave Ingenieros Civiles #204
821 Southlake Blvd.
10 Spy Court
Conjunto Industrial Chachapa
Richmond, Virginia 23236
Markham, Ontario L3R 5H6
72990 Puebla, Pue. Mexico
Telephone: (800) 849-9343
Telephone: (800) 268-4080
Telephone: (222) 286 62 47
Facsimile: (804) 379-2593
Facsimile: (905) 475-2798
Facsimile: (222) 286 62 42
Email: [email protected]
Email: [email protected]
Website: www.weidmuller.ca
Website: www.weidmuller.com
MC6-Current Limiter
Specifications:
Voltage drop across device @ 20mA
2.5Vdc max.
Maximum current in a short circuit condition
24mA
Response time
1ms
Optocoupler output
Voltage
24V ± 20%
Current
50mA max.
Status LED
red LED (on indicates fault)
Operating Temperature
0° to +50°C
Storage Temperature
-20° to +70°C
Wire Size
22 - 12 AWG
Catalog Numbers
991801 0000
MC6- Current Limiter
Block Diagram
Dimensions
9.5mm
89mm
CURRENT
DETECT/LIMIT
24V
Tx+
CAT. NO:
991801
MC6 CURRENT
LOOP LIMITER
991801
TX+
A0
Tx-
TX-
AO
R
COM
ALM
68mm
24V
I LIMIT
ALM
COM
Shown with End Plate
(Not required on all terminals): C9040396
Connection Diagram
-
24V
AO
ALM
PLC
Analog
Input
Tx+
IMAX
+
Tx
Tx-
-
COM
{
P/S +
24Vdc
Two wire
transmitter
(loop powered)
IMAX= 25mA
in all fault
conditions
PLC
Analog
Input
Specifications subject to change without notice. 99990204 - 12/02 Printed in Canada
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