ASL INTERCOM VAR4 Operation Manual page 291

Table 2 0 Remote I/O Unit Faults
Fault Description
Remote I/O unit comms
fault
Remote I/O unit reset
Over temp alarm
Remote I/O unit output
voltage below
predefined limit
Remote I/O unit
analogue channel fault
(open or short)
Remote I/O Unit digital
output fault
(load disconnected or
over current)
Table 2 1 External Faults (Configured on VAR Router Contacts or Remote I/O Analogue and Digital
inputs)
Fault Description
VAR Router Contact
configured as fault input
VAR-NIA power supply
failure (Networked
VAR12/VAR20)
Remote I/O unit digital
input configured as fault
input
Remote I/O unit
analogue channel
configured as fault input
VAR4 / VAR12 / VAR20 - Operation Manual
Fault Code(s)
Reported and Logged
REMXX COMMS
XX=Remote I/O Unit Address
REMXX CPU RESET
XX=Remote I/O Unit Address
REMXX OVER TEMPERATURE
XX=Remote I/O Unit Address
REMXX 24V POWER OUT
XX=Remote I/O Unit Address
REMXX/AINYY ANALOGUE I/P
XX=Remote I/O Unit Address
YY=Analogue Input Channel
REMXX/DOUTYY DIGITAL O/P
XX=Remote I/O Unit Address
YY=Digital Output Channel
Fault Code(s)
Reported and Logged
VARNN/CINXX EXT FAULT
NN=01 to 10 (VAR ID)
XX=Contact number (01 to 62)
"EXT FAULT" text configurable
VARNN/CINXX NIA PSU FAULT
NN=01 to 10 (VAR ID)
XX=Contact (01 to 62) used to
report VAR-NIA power supply
fault
"NIA PSU FAULT"
recommended text, however it is
configurable
REMXX/DINYY EXT FAULT
XX=Remote I/O Unit Address
YY=Digital Input Channel
"EXT FAULT" text configurable
REMXX/AINYY EXT FAULT
XX=Remote I/O Unit Address
YY=Digital Output Channel
"EXT FAULT" text configurable
Is sue: 03 complete, approved
Check the Comms and power wiring to Remote I/O
Unit.
Check RS485 termination.
Check that address of Remote I/O unit is correct.
If all above ok, suspect the unit itself. Check the unit's
internal CPU and COMMS LEDs.
A one of occurrence may be experienced due to EMI
or transients. Repeated occurrences indicate faulty
electronics.
Check the ambient temperature in the equipment
room and investigate Remote I/O unit loading and
drive conditions.
Check power supply.
Check wiring
Selector, or ANS on specified analogue channel.
Check load connection on particular digital channel.
A digital input on the VAR Router, configured to
generate a fault, has been activated.
Check both power supply cabling.
No immediate operational failure if only one PSU is
faulty.
is the
A digital input on a Remote I/O unit, configured to
generate a fault, has been activated.
An analogue channel on a Remote I/O unit,
configured to generate a fault, has been activated.
Page 291 of 308
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