Daikin Pathfinder AWV Installation, Operation And Maintenance Manual page 64

Circuit Status
Circuit Status is displayed to indicate the general condition of
the circuit. The following table lists the text displayed for each
circuit status and the conditions that enable each status. If
more than one status is enabled at the same time, the highest
numbered status overrides the others and is displayed.
Table 53: Circuit Status
Enum Status
1 Off:Ready
2 Off:Cycle Timer
3 Off:OAT Low
Off: Max Starts
4
Per Hr
5 Off:BAS Disable
Off:Keypad
6
Disable
7 Off:Circuit Switch Circuit is off & circuit switch is off
8 Off:Oil Heating
Off:Cmp VFD
9
Heating
10 Off:Alarm
11 Off:Test Mode
12 EXV Preopen
13 Run:Pumpdown
14 Run:Normal
Run:Evap Press
15
Low
Run:Cond Press
16
High
Run:VFD Inp
17
Current High
Run:VFD Temp
18
High
Run:VFD Out
19
Current High
Run: VFD Cap
20
Current Hi
Run:High LWT
21
Limit
IOM 1242-8 • PATHFINDER
Conditions
Circuit ready to start if needed
Circuit is off & cannot start due to
active cycle timer
Circuit is off & cannot start due to
low ambient lockout
Circuit is off & cannot start due to
exceeding 4 starts/hr
Circuit is off & cannot start due to
BAS Circuit Mode input being set
to Off
Circuit is off & cannot start due to
Circuit Mode set point on HMI is
set to Disable
Circuit is off & Oil Sump Check =
Not Ready
Circuit is off, compressor type is
3120 or 3122, and VFD Temp is
too low to start.
Circuit is off & cannot start due to
active circuit alarm
Circuit is in test mode
Circuit is in preopen state
Circuit is in pumpdown state
Circuit in run state & running
normally
Circuit in start or run state &
cannot load due to low evap
pressure
Circuit is in start or run state &
cannot load due to high condenser
pressure
Circuit in start or run state &
cannot load due to high VFD line
current
Circuit in start or run state &
cannot load due to high VFD temp
Circuit in start or run state &
cannot load due to high motor
current
Circuit is in start or run state and
cannot load due to high VFD
capacitor current.
Circuit is in start or run state &
cannot load due to the evaporator
LWT exceeding the limit for
allowing full capacity
MODEL AWV CHILLERS
®
Compressor Control
The compressor is controlled via:
• a digital output to give the run command to compressor
VFD
• a modbus speed command to control compressor speed
• a Modbus command to reset alarms/faults in the
compressor VFD
• digital outputs for compressor VR solenoids to control VR
• a digital output for liquid injection to the compressor
• a Modbus run command to the compressor VFD (for 3120
and 3122 compressors only)
• a digital output for the VFD heater (for 3120 and 3122
compressors only)
• a digital output for the oil sump heater (for 3120 and 3122
compressors only)
Run Command Output
The compressor run command output should be on when
the circuit state is Start, Run, or Pumpdown. It should be off
when the circuit state is Off or Preopen. For 3120 and 3122
compressors, the run command to the VFD via Modbus should
also be on when the digital output is on.
VFD Alarm Reset Command
For all compressor types, when alarms are cleared in the
unit controller and there are any active alarms or faults in the
VFD, the alarm reset command should be sent to the VFD via
modbus.
In addition, if the compressor type is 3120 or 3122, five
seconds after the controller boots up if there are any active
alarms in the VFD at all, the alarm reset command should be
sent to the VFD. This is done to clear out any alarm in the VFD
that might occur during a power cycle.
Cycle Timers
A minimum time must pass between starts of each compressor.
When the compressor starts, a timer starts which will run for a
time determined by the Start-Start Timer set point.
A minimum time must pass between the stop and start of each
compressor. When the compressor stops, a timer starts which
will run for a time determined by the Stop-Start Timer set point.
While either timer is running, the compressor cannot start. Both
cycle timers will be enforced even through cycling of power to
the chiller. These timers may be cleared via the Clear Cycle
Timers set point.
Starts Per Hour Limit
In addition to the cycle timers, a limit of four starts per hour
is enforced. A buffer of start times for the last four starts is
maintained. If the current time is an hour or less after the first
timestamp in the buffer, the next start will be delayed.
This limit is cleared if the Clear Cycle Timers set point is set to
Yes.
64
Circuit Functions
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