KMD-5205 and KMD-5270 Installation and Operation
Revision J
23
SECTION 3
Operating the controller
This section provides general operating parameters of your KMC
controller and a detailed description of the front panel display.
Lights and indicators
Isolation bulbs
Two small bulbs located next to the RS-485 connector are protective isolation
bulbs for the Tier 2 networks. These bulbs serve three functions:
◆
When illuminated they indicate improper network phasing. Improper
phasing occurs when the ground potential of the controller is higher than the
phase or the ground potential of other Tier 2 or Modbus controllers on the
network.
◆
The bulbs protect the controller from damage by limiting the network signal.
If voltage or current exceeds safe operating condition, the bulbs will open
the connections between the controller and the network.
◆
By pulling the bulbs from their sockets you can disconnect the controller
from the network.
Illustration 3-1 Controls and indicators
O-R
STATUS
H O A
O-R
STATUS
H O A
O-R
STATUS
H O A
O-R
STATUS
H O A
1
2
3
4
O-R
STATUS
H O A
O-R
STATUS
H O A
O-R
STATUS
H O A
O-R
STATUS
H O A
5
6
7
8
PWR
S-LAN
PC
COLL
Rx
Tx
WD
Reset
button
Indicator
LEDs
Power
jumper
Isolation
bulbs
Termination
switch
