Power Requirements - Emerson Micro Motion 5700 Installation Manual

Planning
May 2019
2.2

Power requirements

Self-switching AC/DC input, automatically recognizes supply voltage:
• 85 to 240 VAC, 50/60 Hz, 6 watts typical, 11 watts maximum
• 18 to 100 VDC, 6 watts typical, 11 watts maximum
Note
For DC power:
• Power requirements assume a single transmitter per cable.
• At startup, the power source must provide a minimum of 1.5 amps of short-term
current per transmitter and not pull voltage below 18 VDC.
• Length and conductor diameter of the power cable must be sized to provide 18 VDC
minimum at the power terminals, at a load current of 0.7 amps.
Cable sizing formula
M = 18V + (R x L x 0.5A)
• M: minimum supply voltage
• R: cable resistance
• L: cable length (in Ω/ft)
Typical power cable resistance at 68 °F (20.0 °C)
Wire gauge
14 AWG
16 AWG
18 AWG
20 AWG
2.5 mm
1.5 mm
1.0 mm
0.75 mm
0.50 mm
2.2.1 Maximum cable lengths between sensor and transmitter
The maximum cable length between the sensor and transmitter that are separately
installed is determined by cable type.
8
2
2
2
2
2
Resistance
0.0050 Ω/ft
0.0080 Ω/ft
0.0128 Ω/ft
0.0204 Ω/ft
0.0136 Ω/m
0.0228 Ω/m
0.0340 Ω/m
0.0460 Ω/m
0.0680 Ω/m
Micro Motion 5700 transmitters with Intrinsically Safe Outputs
Installation Manual
MMI-20039473