Emerson Rosemount 3051S ERS Reference Manual page 24

Installation
November 2016
Rosemount 3051S ERS System cable specifications
Cable type: Recommend gray Madison 04ZZXLF015 cable, blue Madison 04ZZXLF021 cable, and
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Southwire HLX01-POS armor cable. Other comparable cable may be used as long as it has independent
dual twisted shielded pair wires with an outer shield. The power wires (pin terminals 1 and 2) must be
22 AWG minimum and the communication wires (pin terminals A and B) must be 24 AWG minimum.
Maximum cable length: The total length of cable used to connect the ERS primary transmitter,
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secondary transmitter, and remote display (if ordered) should not exceed maximum lengths below.
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For SIS maximum lengths see
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Cable capacitance: The capacitance between the communication lines as wired must be less than
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5000 picofarads total. This allows up to 50 picofarads per foot (164 picofarads/meter) for a 100-ft.
cable.
Gray and blue cable outside diameter: 0.270-in. (6.86 mm)
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Armor cable outside diameter: 0.76-in. (19.3 mm)
For armored cable, cable glands are included with the packaging
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4–20 mA loop wiring specifications
It is recommended to use twisted pair wiring. To ensure proper communication, use 24 to 14 AWG wire,
and do not exceed 5000 feet (1500 meters).
Note
There are four connections plus shield, which require correct configuration for operation. There is no
mechanism that can result in re-sequencing of messages from the physical connections.
Surges/transients
The Rosemount 3051S ERS System will withstand electrical transients of the energy level usually
encountered in static discharges or induced switching transients. However, high-energy transients, such
as those induced in wiring from nearby lightning strikes, can damage the Rosemount ERS System.
Optional transient protection terminal block
The transient protection terminal block can be ordered as an installed option (option code T1) or as a
spare part to retrofit an existing Rosemount ERS System in the field. A lightning bolt symbol on a
terminal block identifies it as having transient protection.
Note
The transient terminal block is only available as an option on the primary Rosemount 3051S ERS
Transmitter. When ordered and installed, a primary Rosemount 3051S ERS Transmitter with the
transient terminal block will protect the entire Rosemount ERS Assembly including the secondary
Rosemount 3051S ERS Transmitter.
Power supply requirements
The DC power supply should provide power with less than two percent ripple. The total loop resistance is
the sum of the resistance from the signal leads and the load resistance of the controller, indicator, and
related pieces. Note that the resistance of intrinsically safe barriers, if used, must be included.
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Madison (gray cable): up to 500 feet (152,4 meters) for non-IS applications and 225 feet (68,58
meters) for IS applications; consult Emerson for applications requiring beyond 500 feet.
Madison (blue cable): up to 225 feet (68,58 meters) for IS applications
Armored cable: up to 125 feet (38,1 meters).
"Rosemount ERS Systems safety certified identification" on page 61
Reference Manual
00809-0100-4804, Rev CB
Installation