EQUIPMENT MANUAL FOR RD-9120
RD-9120 QE
Copyright - refer to title page
Page 29
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4 COMMISSIONING
4.1 MCU LED INDICATORS
Four diagnostic LEDs are located on the MCU, each indicates the status of a particular function:
Identifier Colour
Indication
L1
Red
Online programming. This will flash when users read, set or download files via
OMT.
L2
Red
Warning LED, when ON, it indicates alarm condition
L3
Green
MCU operation. Flashing at a rate of 1 flash/sec. Any other flashing rate
indicates MCU is faulty, and has to be replaced.
L4
Red
Wireless modem status. During normal operation, it is OFF, while ON, it’s
indicating faulty wireless modem and no communication will take place.
Table 8: LEDs on MCU
MCU Initialization
The diagnostic LED L2, L3 and L4 will flash simultaneously at the time the equipment is power up,
indicating the system is self-checking. About 60 seconds later, L3 will keep flashing at the rate of 1
flash/second. L2 will be ‘ON’ when any alarm occurs. L4 will turn ‘OFF’, after successful initialization of
modem; otherwise, it will remain ‘ON’, when remote commission is not available.
L3
L2
Connect to Distribution Board
L1
L4
Push-button
switch
PSU
Distribution Board
MCU
Wireless Modem
Figure 9: Location of MCU and LEDs
On the MCU there is a yellow push-botton switch used to manually reset the equipment.
4.2 EQUIPMENT POWER-UP
Before applying power, check that the expected voltage, current, and power levels do not violate any
ratings. Double check all connections before applying power. Do not manipulate circuits or make changes
with power applied.
