Siemens 549-614 Installation Instructions Manual - Page 6

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Using the HOAs Before Start-up

If the HOAs are required for equipment control

before the MEC start-up is performed, perform the

following procedure to set the analog point jumpers.

CAUTION:

Always wear an electro-static discharge

wrist strap and discharge accumulated

static before touching field panel

components.

NOTE: The jumpers are shipped in the Voltage (V)

position. The jumpers must remain in this

position when they are not being used.

With an ESD wrist strap attached to your wrist

and a good earth ground, remove the MEC

front cover. See Figure 2.

Set the jumpers on the termination board to the

desired physical point type for the analog input

(AI) and analog output (AO) points. See Figure

3 for the jumper positions.

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3. If required, install the MEC 100K Thermistor

jumper on the lower left pins of each analog

input point that is monitoring a 100K thermistor.

See Figure 3 for the jumper positions.

For more information, see the MEC 100K

Thermistor Option Kit Installation Instructions

(586-679).

4. Connect the HOA switch cable.

5. Replace the MEC front cover.

The HOAs may now be used to control equipment.

HOA Status LEDs

For MECs with HOA switches, a green LED is

located below the HOA switches. The LED flashes

after start-up, indicating that the switches are in the

AUTO position and are functioning correctly.

If any control switch is moved out of AUTO, the light

stops flashing and remains on.

Document No. 586-146

Installation Instructions

July 30, 2008

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