PROTECTION Universal Contact Input Adapter M 908 Converts seven internally wetted contacts to be compatible with Beckwith MXX protective relays and M Motor Bus Transfer System contact inputs Operates with V to 0 V dc wetting voltages Provides two input terminals per contact input Input to Output is optically isolated Industry Leader Since 99 Made in the USA
M 908 Universal Contact Input Adapter Specification Description The M908 Universal Contact Input Adapter will convert seven internally wetted status inputs of Beckwith relays to be externally wetted. The input voltage is selectable: 0 V dc, V dc, 8 V dc, V dc or V dc. This selection is made through a series of jumpers (Table ) on the printed circuit board. Each of the externally wetted inputs will be isolated from all other externally wetted inputs. Input to Output is optically isolated. n = JUMPER NUMBER NOMAL VOLTAGE JnA JnB JnC JnD V dc V dc 8 V dc V dc 0 V dc Table Input Voltage Jumper Configuration Terminal blocks are used for all connections to the device which includes two independent terminals per input circuit. The device will be panelmounted. There is an inherent ms delay from input to output operating time. Physical Size: 8." wide X.0" high X.0" deep (.cm X.cm X.8cm) Approximate Weight: lbs.,. oz (.9 kg) 0.8 [0.9] 0.0 [.].90 [.].90 [.8] 0.0 [.].0
M 908 Universal Contact Input Adapter Specification Atmospheric Environment Temperature IEC 008 Cold, 0 C IEC 008 Dry Heat, 0 C IEC 0088 Damp Heat, 0 C @ 9% RH Dielectric Withstand IEC 0 00 V dc for minute applied between each independent circuit and earth 00 V dc for minute applied between each independent circuit Insulation Resistance IEC 0 >00 Megaohms Surge Withstand Capability ANSI/IEEE 00 V pk oscillatory applied to each independent circuit to earth C.90.989 00 V pk oscillatory applied between each independent circuit 000 V pk fast transient applied to each independent circuit to earth 000 V pk fast transient applied between each independent circuit Warranty The M 908 Universal Contact Input Adapter is covered by a five year warranty from date of shipment. Specification subject to change without notice.
M 908 Universal Contact Input Adapter Specification V dc (9 to 0 V dc) Externally Wetted Contacts NOTE: Add a ground wire at the mounting plate and connect it to the cubicle chassis ground bar. TB TB 0 9 8 M908 TO RELAY 8 p CAUTION: To reduce noise susceptibility twisted, shielded cable (shield grounded on one end only) should be used on the Low Voltage outputs at TB. The remote contacts should be independently hispeed fused at low amperage. Do not bundle low voltage conductors with PT, CT and V dc cables. Internally Wetted Contact Inputs ( V dc) Beckwith Electric Relay NOTE: Two M908 adapters can be used with the M, M, MA, or MA with Expanded I/O. Figure Typical Application with Common Wetting Voltage Example
M 908 Universal Contact Input Adapter Specification V dc (9 to 0 V dc) All inputs may originate from independent sources of different voltages Externally Wetted Contacts May be a mix of NO and NC contacts NOTE: Add a ground wire at the mounting plate and connect it to the cubicle chassis ground bar. TB 0 9 8 M908 UNIVERSAL CONTACT PUT ADAPTER TO RELAY TB 8 p CAUTION: To reduce noise susceptibility twisted, shielded cable (shield grounded on one end only) should be used on the Low Voltage outputs at TB. The remote contacts should be independently hispeed fused at low amperage. Do not bundle low voltage conductors with PT, CT and V dc cables. Internally Wetted Contact Inputs ( V dc) Beckwith Electric Relay NOTE: Two M908 adapters can be used with the M, M, MA, or MA with Expanded I/O. Figure Application Example with Multiple Wetting Voltages
M 908 Universal Contact Input Adapter Specification EXTERNAL TRANSFER ITIATE PUTS V dc (9 to 0 V dc) All inputs may originate from independent sources of different voltages Externally Wetted Contacts b aux contact Externally Wetted Contacts Protection Relays Trip Contact b aux contact b aux contact Protection Relays Trip Contact b aux contact NOTE: Add a ground wire at the mounting plate and connect it to the cubicle chassis ground bar. TB 0 9 8 M908 UNIVERSAL CONTACT PUT ADAPTER TB TO RELAY 8 p CAUTION: To reduce noise susceptibility twisted, shielded cable (shield grounded on one end only) should be used on the Low Voltage outputs at TB. The remote contacts should be independently hispeed fused at low amperage. Do not bundle low voltage conductors with PT, CT and V dc cables. Internally Wetted Contact Inputs ( V dc) Beckwith Electric Motor Bus Transfer System Figure Application Specific to a BiDirectional Automatic Transfer
M 908 Universal Contact Input Adapter Specification TRADEMARKS All brand or product names referenced in this document may be trademarks or registered trademarks of their respective holders. Specification subject to change without notice. Beckwith Electric Co., Inc. has approved only the English version of this document.
BECKWITH ELECTRIC CO., C. 90 8th Avenue North Largo, Florida U.S.A. PHONE () FAX () 0 marketing@beckwithelectric.com www.beckwithelectric.com ISO 900:0 00 Beckwith Electric Co. All Rights Reserved. Printed in USA 800908SP08 08/8