122
Table 103 — Compressor Run Hours Display Table
Table 104 — Compressor Starts Display Table
Table 105 — Software Version Numbers Display Table
Alarms and Alerts
There are a variety of different alerts and alarms in the system.
P — Pre-Alert: Part of the unit is temporarily down. The alarm is
not broadcast on the CCN network. The alarm relay is not ener-
gized. After an allowable number of retries, if the function does
not recover, the pre-alert will be upgraded to an alert or an alarm.
T — Alert: Part of the unit is down, but the unit is still partially
able to provide cooling or heating.
A — Alarm: The unit is down and is unable to provide cooling or
heating.
All alarms are displayed with a code of AXXX where the A is the
category of alarm (Pre-Alert, Alert, or Alarm) and XXX is the
number.
The response of the control system to various alerts and alarms de-
pends on the seriousness of the particular alert or alarm. In the
mildest case, an alert does not affect the operation of the unit in
any manner. An alert can also cause a “strike.” A “striking” alert
will cause the circuit to shut down for 15 minutes. This feature re-
duces the likelihood of false alarms causing a properly working
system to be shut down incorrectly. If three strikes occur before
the circuit has an opportunity to show that it can function properly,
the circuit will strike out, causing the shutdown alarm for that par-
ticular circuit. Once activated, the shutdown alarm can only be
cleared via an alarm reset.
Circuits with strikes are given an opportunity to reset their strike
counter to zero. As discussed above, a strike typically causes the
circuit to shut down. Fifteen minutes later, that circuit will once
again be allowed to run. If the circuit is able to run for 1 minute, its
replacement circuit will be allowed to shut down (if not required
to run to satisfy requested stages). However, the “troubled” circuit
must run continuously for 5 minutes with no detectable problems
before the strike counter is reset to zero.
In addition, the compressors have several diagnostics monitoring
the safety of the system which may cause a number of attempts to
be re-tried before locking out the system from operation. This fea-
ture reduces the likelihood of false alarms causing a properly
working system to be shut down incorrectly.
For the compressor and circuit diagnostics, some of these alerts/
alarms will not broadcast an initial failure to the CCN network un-
til all attempts to recover have occurred and failed. These alerts
will be accessible in the alarm history of the control
(Alarms
HIST).
All the alarms and alerts are summarized in Table 106.
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
HRS COMPRESSOR RUN HOURS
HR.A1 Compressor A1 Run Hours 0-999999 HRS HOURS_A1 config
HR.A2 Compressor A2 Run Hours 0-999999 HRS HOURS_A2 config
HR.A3 Compressor A3 Run Hours 0-999999 HRS HOURS_A3 config
HR.B1 Compressor B1 Run Hours 0-999999 HRS HOURS_B1 config
HR.B2 Compressor B2 Run Hours 0-999999 HRS HOURS_B2 config
HR.B3 Compressor B3 Run Hours 0-999999 HRS HOURS_B3 config
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
STRT COMPRESSOR STARTS
ST.A1 Compressor A1 Starts 0-999999 CY_A1 config
ST.A2 Compressor A2 Starts 0-999999 CY_A2 config
ST.A3 Compressor A3 Starts 0-999999 CY_A3 config
ST.B1 Compressor B1 Starts 0-999999 CY_B1 config
ST.B2 Compressor B2 Starts 0-999999 CY_B2 config
ST.B3 Compressor B3 Starts 0-999999 CY_B3 config
ITEM EXPANSION RANGE UNITS CCN POINT DEFAULT
VERS SOFTWARE VERSION NUMBERS
MBB CESR131461-xx-xx string
RXB CESR131465-xx-xx string
EXB CESR131465-xx-xx string
CEM CESR131174-xx-xx string
CXB CESR131173-xx-xx string
SCB CESR131226-xx-xx string
VFD1 VERSION-313D string
VFD2 VERSION-313D string
MARQ CESR131171-xx-xx string
NAVI CESR130227-xx-xx string
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