Instrument Power Supplies Model DPS Description Compact, DIN-style power supply quickly installs on a G-type rail. It is ideal for powering our DIN-style transmitters, alarm trips, and data communication modules. Voltage Output Current Output Power Output 24Vdc 42Vdc 240mA 1200mA 117Vac 220Vac 240Vac 24Vdc 70mA 200mA 117Vac 230Vac 24Vdc 42Vdc 200mA 117Vac 220Vac 240Vac 24Vdc 32Vdc 65mA 117Vac 220Vac 240Vac 5Vdc 12Vdc 15Vdc 24Vdc 6A 3.4A 3.0A 2.4A 3.6A 100Vac 117Vac 230Vac 240Vac Model Number Example: DPS / 24DC / 1200MA / 117AC / [DIN] ECS Our economy power supply, this DIN-style module powers our ECT line of 2and 4-wire Economy Isolators and Converters. It mounts on G-type and Top Hat rails. Model Number Example: ECS / 24DC / 70MA / 117AC / [ECD] PPS This surface-mount supply powers our popular 4-wire transmitters, alarms, and special function units. The -CT Card Tester option provides a means to test our plug-in card instruments. Model Number Example: PPS / 24DC / 200MA / 117AC / -CT [UB] PPX Suitable for hazardous areas, this power supply features an explosion-proof enclosure for powering our 2-wire transmitters in field environments. Model Number Example: PPX / 24DC / 65MA / 117AC / [2LS] SMP This supply is designed to power large numbers of 2- and 4-wire instruments, such as those installed in a cabinet or instrument sub-system. Model Number Example: SMP / SOS / 24DC-2.4A / 117AC / -OVP [SMP] © 2011 Moore Industries-International, Inc. August 2011 Instrument Instrument Power PowerSupplies Supplies Sizing Power Supplies 2-Wire (loop-powered) Instruments The majority of 2-wire transmitters output a 4-20mA signal when using a 24Vdc power supply. The typical transmitter has a lift off voltage of 12Vdc. By using Ohms Law, E (voltage) = I (current) x R (resistance), it can be determined that the total allowable resistance in the control loop is R = E/I or 24-12V/0.02A = 600 ohms. Note that by increasing the power supply voltage to 32Vdc, the total loop load is increased by 1000 ohms. 2400 Power a Transmitter with a Signal Converter With the -TX option, our 4-wire signal transmitters, isolators, converters and alarm trips provide 24V power to a 2-wire, output-loop powered instrument. This eliminates the need for an additional power supply. LOOP POWER 2-Wire Transmitter ECT 4-20mA Receiver mA, V Relay 2200 4-20mA LIMIT 60Vdc MAXIMUM WITHOUT DAMAGE Load Capability (ohms) 2000 1800 1600 R (Load) = 1400 E-12 1500Ω with 42Vdc Supply I 1200 42Vdc Maximum (based on CSA listing) measured at the input terminals 1000 10-50mA 800 600 600Ω with 24Vdc Supply 600Ω with 42Vdc Supply Moore Industries Signal Converter with Transmitter Excitation 400 200 240Ω with 24Vdc Supply 12Vdc 0 10 20 30 40 Power Supply (Volts dc) 50 60 4-Wire (line-powered) Instruments To determine the required power supply amperage, use the formula: P (power, watts) = I (current, amps) x E (voltage) Add the wattage of each instrument to be powered by the supply and divide by the power supply voltage (normally 24Vdc). 24Vdc Additional Instruments DPS 4-Wire Transmitter 4-Wire Isolator 4-Wire Alarm Moore Industries Power Supply United States • firstname.lastname@example.org Tel: (818) 894-7111 • FAX: (818) 891-2816 Australia • email@example.com Tel: (02) 8536-7200 • FAX: (02) 9525-7296 Belgium • firstname.lastname@example.org Tel: 03/448.10.18 • FAX: 03/440.17.97 The Netherlands • email@example.com Tel: (0)344-617971 • FAX: (0)344-615920 China • firstname.lastname@example.org Tel: 86-21-62491499 • FAX: 86-21-62490635 United Kingdom • email@example.com Tel: 01293 514488 • FAX: 01293 536852 Specifications Subject to Change. Printed in U.S.A.
* Your assessment is very important for improving the work of artificial intelligence, which forms the content of this project