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Operating Procedures
Table 4. The overview screens
Primary Overview Module Screen
Primary and Secondary Overview Circuit Screen
Overview Module
Module En/Dis
Pressing this button enables or disables a module. If
module is disabled, it's excluded from primary control
compressors sequence. Not accessible for 'user.'
Module Status
Possible options:
1. Module ON. Module is ready to run.
2. OFF by Schedule. Module operates according to
predefined schedule and is currently off as scheduled.
3. OFF by DI. Module is off by opened state of PLC DI1.
4. OFF by Keypad. Module is off by Module En/Dis button.
5. OFF by Alarm. Module is locked out by one of the major
alarms.
6. OFF by Primary. Module is switching between control
states Primary / Secondary / Stand-alone.
7. OFF by System. Module is off by one of the System Off
conditions.
8. Man Mode. Module is in manual mode.
Module Cntrl Status
Possible options:
1. Primary. Module acts as a primary module. Primary
module performs temperature control for either heating
30
Secondary Overview Module Screen
or cooling loads. It also acts as a Supervisor when
communicating with secondary modules and defines
how many modules need to run its compressors in
order to satisfy heating or cooling controlled
temperatures.
2. Secondary. Module acts as a secondary module.
Conditions for the module to be a secondary module:
a. Its PLC has been assigned IP address from
secondaries addresses range
b. It's communicating with primary module
c. Primary module exists on the network, in other
words Primary PLC meets primary module
conditions (see Primary Status below).
d. Stand-alone. Module doesn't meet either primary
module or secondary module conditions.
Primary Status
Applies to primary PLC only. Possible options:
1. Primary ON. All primary modules conditions are
satisfied by module.
2. Waiting ... All primary modules conditions are satisfied
and module is counting down a delay before acquiring
primary ON status.
3. OFF by Sensor. System cooling or heating temperature
sensor failed.
4. OFF by no secondaries. Primary PLC communicates
with no secondaries.
ARTC-SVX006A-EN
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