Section 3: Wiring; General - Emerson Rosemount 1057 Instruction Manual

Instruction Manual
LIQ-MAN-1057

Section 3: Wiring

3.1

General

The Model 1057 is easy to wire. It includes removable connectors and slide-out signal input boards.
3.1.1 Removable Connectors and Signal Input Boards
Model 1057 uses removable signal input boards and communication boards for ease of wiring
and installation. Each of the signal input boards can be partially or completely removed from the
enclosure for wiring. The Model 1057 has three slots for placement of up to three signal
input boards and one communication board.
Figure 3-1 Model 1057 Signal Input Boards
Note: If the UL option code has been ordered, a plastic insulator shield surrounds the entire power
supply board (AC power supply only). The protective insulator shield does not appear in this photo.
3.1.2 Signal Input Boards
Slots 1, 2 and 3 are for signal input measurement boards. Wire the sensor leads to the
measurement board following the lead locations marked on the board. After wiring the sensor leads
to the signal board, carefully slide the wired board fully into the enclosure slot and take up the excess
sensor cable through the cable gland. Tighten the cable gland nut to secure the cable and ensure a
sealed enclosure.
Note: that signal input board 3 is inserted into slot 1. Board 3 is inverted in the slot to allow board
components to face to the right. Board 3 uses a long ribbon cable to connect to the main PCB. Boards
1 and 2 use a split ribbon cable to connect both signal boards to a common connector on the
main board.
3.1.3 Alarm Relays
Four alarm relays are supplied with the switching power supply (84 to 265 Vac, 03 order code) and the
24 Vdc power supply (20-30 Vdc, 02 order code). All relays can be used for process measurements
or temperature. Any relay can be configured as a fault alarm instead of a process alarm. Each
relay can be configured independently and each can be programmed as an interval timer, typically
used to activate pumps or control valves. As process alarms, alarm logic (high or low activation or
USP*) and deadband are user-programmable. Customer-defined failsafe operation is supported as a
programmable menu function to allow all relays to be energized or not-energized as a default
condition upon powering the analyzer. The USP alarm can be programmed to activate when the
conductivity is within a user-selectable percentage of the limit. USP alarming is available only when a
contacting conductivity measurement board is installed.
Section 3: Wiring
Slot 1 – Left Slot 2 – Center
Signal board 3 Signal board 2
Slot 3 – Right
Signal board 1
Section 3: Wiring
April 2017
11