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