Document No. 586-146
Installation Instructions
July 30, 2008
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.
1. With an ESD wrist strap attached to your wrist
and a good earth ground, remove the MEC
front cover. See Figure 2.
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.
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.
Siemens Building Technologies, Inc.
Page 5 of 6
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