Diagnosing The Location Of Fault(S) Using The "System Ok" Leds - Baldwin Boxall OmniCare Installation Manual

OmniCare EVC System
Installation & Commissioning Manual
6.2.5 Diagnosing the Location of Fault(s) using the
78
• Poor Terminations on Remote Units 4 and 7:
If the terminations on Remote Units 4 and 7 are loose or
poorly made the integrity of the loop will suffer.
• CAN H and CAN L cables reversed:
If the CAN H and CAN L cables have been swapped (in this
example between Remote Units 3 and 4), and then swapped
back further around the loop (between Remote Units 7 and
8) this would result in losing Remote Units 4, 5, 6 and 7.
If this is the case, the "SYSTEM OK" indicators on Remote
Units 4, 5, 6, and 7 would be flashing whereas the indicators
on Remote Units 1, 2, 3 or 8 would be ON.
• There could be two separate cable faults:
These faults could be open circuit connections, shorts to
earth etc. The cabling between (in this example) Remote
Units 3 & 4 and between 7 & 8 should be checked.
"System OK" LEDs
An alternative method of diagnosing the location of faults is to
walk around the loop and check the status of the "System OK"
LEDs on the front panel of each Remote Unit.
N : This method can only be used if the Loop Integrity of the Power
OTE
Cables has been checked successfully (see Section 6.2.3).
1. Ensure both ends of the loop are terminated correctly at the
control panel.
C
A U T I O N
Ensure Mains Power is disconnected before connecting or
disconnecting Loop Circuits.
2. Press "Reset" on the front panel of the control panel.
3. Walk around the loop starting from the "A" terminal and
note the status of the "System OK" LED on each Remote
Unit.
4. The LED status is described in Section 6.3.3.2.
C O M M U N I C A T I O N S
OmniCare issue 1