Emerson Rosemount 3051S Reference Manual page 21

Reference Manual
00809-0100-4804, Rev AA
January 2011
Figure 2-8. Alarm and Security
Switches
Connect Wiring and
Power UP
Rosemount 3051S ERS System
Switch Configuration Procedure
To reposition the hardware switches, follow the procedure below:
1. Do not remove the housing covers in explosive atmospheres when
the circuit is live. If the ERS system is live, set the loop to manual and
remove power.
2. On the ERS primary sensor, remove the housing cover opposite the
field terminal side.
3. Reposition the alarm and security switches as desired, by using a
small screwdriver.
4. Reinstall the housing cover. Covers must be fully engaged so that the
metal contacts metal in order to meet flameproof / explosion-proof
requirements.
Security
Switch
Typical ERS System (Figure 2-9)
1. Remove the housing cover labeled "Field Terminals" on both ERS
sensors.
2. Using the ERS Madison Cable (if ordered) or an equivalent 4-wire
shielded assembly per the specifications detailed on page 2-14,
connect the 1, 2, A, and B terminals between the two sensors per
Figure 2-9.
3. Connect the ERS system to the control loop by wiring the "+" and "–"
PWR / COMM terminals of the ERS primary sensor to the positive
and negative leads, respectively.
4. Plug and seal all unused conduit connections.
5. If applicable, install wiring with a drip loop. Arrange the drip loops so
that the bottom is lower than the conduit connections and the
transmitter housings.
6. Reinstall and tighten the housing covers on both sensors so that
metal contacts metal to meet explosion-proof requirements.
Alarm
Switch
2-13