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Digital LEDs
There is an LED for each digital input that indicates its
current state. For all inputs, the color of the LED signifies
its current state:
Figure 22. Digital inputs
DI1 Remote On/Off
This activates a module on or off via digital input. If the
master digital on-off input is enabled, toggling the DI1 on
the master module will turn the entire chiller/heater on or
off.
DI2, DI3, and DI4
These show the states of the evaporator, condenser, or
source flow switches. If the digital input for a switch
indicates closed, flow is present. If the digital input for a
switch indicates open, flow is absent.
DI7 and DI8
These show the discharge and suction pressure switches.
If the digital input for a switch indicates closed, the
pressure is in the normal range. If the digital input for a
switch indicates open, the pressure is exceeding normal
range threshold (that is, faulty state).
DI9 Phase Monitor
This is feedback for the three-phase power supply
protection feature. If the digital input for this switch
indicates closed, there are no power supply issues. If the
digital input for this switch indicates open, a power supply
failure has been detected.
If the master phase monitor is enabled, the common
power supply protection module is active for the chiller/
heater. Failure of the phase monitor will affect all modules
in the chiller/heater. In this case, digital input is optional for
the slave modules.
Digital Outputs
There is an LED for each digital output which shows its
current state.
ARTC-SVX005A-EN
•
Green LED This digital input is energized, the
connected device is closed.
•
Gray LED This digital input is de-energized, the
connected device is open.
DO1, DO2 Comp On/Off
This digital output turns a compressor on and off.
DO3 Liq Line Solenoid 'E'
This digital output energizes and de-energizes the liquid
line solenoid valve E.
DO4 Liq Line Solenoid 'S'
This digital output energizes and de-energizes the liquid
line solenoid valve S.
DO6, DO7, DO8, DO9
Valve D1, D2, S1, S2. Used to command refrigerant valves
open / closed. Green LED - valve is commanded open.
Grey LED - valve is commanded closed.
DO10 General Alarm
This digital output energizes when any of the following
alarms occur:
•
An alarm that shuts down and locks out compressor 1
or 2.
•
An alarm that shuts down and locks out the entire
module.
DO11 Panel Heater / Fan (optional)
This is the digital output is used when temperature control
inside control panel is required (identical to AI9).
Operating Procedures
41
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