Trane Ascend ACR Series, Инструкция по установке, эксплуатации и обслуживанию

Страница: 43 / 112

AC-SVX001A-EN 43
though there was a zero time delay. Exceptions
whereby the relay continues to be energized occur
with:
• L Lo ow w C Ch hiilllle ed d W Wa atte err T Te em mp pe erra attu urre e d diia ag gn no ossttiicc (non-
latching unless also accompanied by an Evap
Leaving Water Temperature Sensor Diagnostic)
OR
• IIn ntte errrru up ptt F Fa aiillu urre e — —A AF FD Dx xA A d diia ag gn no ossttiicc where x is
either 1 or 2 to indicate which drive is affected), in
which a compressor continues to draw current even
after commanded to have shutdown.
OR
• L Lo ossss o off E Ev va ap po orra atto orr W Wa atte err F Fllo ow w d diia ag gn no ossttiicc (non-
latching) and the unit is in the AUTO mode, after
initially having proven evaporator water flow.
Programmable Relays
A programmable relay concept provides for
enunciation or hardwired interlocking of certain events
or states of the chiller, selected from a list of likely
needs, while only using four physical output relays, as
shown in the field wiring diagram. The four relays are
provided (generally with a Quad Relay Output LLID) as
part of the Programmable Relay Option. The relay’s
contacts are isolated Form C (SPDT), suitable for use
with 120 VAC circuits drawing up to 2.8 amps inductive,
7.2 amps resistive, or 1/3 HP and for 240 VAC circuits
drawing up to 0.5 amp resistive.
The list of events/states that can be assigned to the
programmable relays can be found in the following
table. The relay will be energized when the event/state
occurs.
Table 15. Alarm and status relay output
configurations
Description
Alarm
(Latching)
This output is true whenever there is any
active latching shutdown diagnostic that
targets the Unit, Circuit, or any of the
Compressors on a circuit.
Alarm
(Non-Latching)
This output is true whenever there is any
active non-latching shutdown diagnostic that
targets the Unit, Circuit, or any of the
Compressors on a circuit.
Alarm
This output is true whenever there is any
active latching or non-latching shutdown
diagnostic that targets the Unit, Circuit, or
any of the Compressors on a circuit.
Alarm Ckt 1
This output is true whenever there is any
active latching or non-latching shutdown
diagnostic that targets Circuit 1, or any of the
Compressors on Circuit
Alarm Ckt 2
This output is true whenever there is any
active latching or non-latching shutdown
diagnostic that targets Circuit 2, or any of the
Compressors on Circuit 2.
Table 15. Alarm and status relay output
configurations (continued)
Description
Unit Limit Mode
This output is true whenever a circuit on the
unit has been running in one of the limit
modes continuously for the Limit Relay
debounce time. A given limit or overlapping of
different limits must be in effect continuously
for the debounce time prior to the output
becoming true. It will become false if no limits
are present for the debounce time.
Compressor
Running The output is true whenever any compressor
is running.
Circuit 1
Running The output is true whenever any compressor
of Circuit 1 is running.
Circuit 2
Running The output is true whenever any compressor
of Circuit 2 is running.
Maximum
Capacity
The output is true whenever the unit has
reached maximum capacity continuously for
the Max Capacity Relay debounce time. The
output is false when the unit is not at
maximum capacity continuously for the filter
debounce time.
Head Pressure
Relief Request
This relay output is energized anytime the
chiller or a single circuit on the chiller is
running in one of the following modes; Ice
Making Mode, or Condenser Pressure Limit
continuously for the duration specified by the
Chiller Head Relief Relay Filter Time. The
Chiller Head Relief Relay Filter Time is a
service setpoint. The relay output is de-
energized anytime the chiller exits all above
modes continuously for the duration specified
by the same Chiller Head Relief Relay Filter
Time
Relay Assignments Using Tracer
TU
Tracer ® TU Service Tool is used to install the
Programmable Relay Option package and assign any of
the above list of events or status to each of the four
relays provided with the option. (See Tracer
® TU
section of Controls chapter for more information on
this service tool.) The relays to be programmed are
referred to by the relay’s terminal numbers on the LLID
board 1K13.
The default assignments for the four available relays of
the Programmable Relay option are show in the table
below.
Table 16. Default assignments
Relay Assignment
Relay 1 Terminals J2-1,2,3:
Unit Limit Mode
Relay 2 Terminals J2-4,5,6: Maximum Capacity
Relay 3 Terminals J2 - 7,8,9: Compressor Running
Relay 4 Terminals J2 -10,11,12:
Alarm
IIn nsstta alllla attiio on n E Elle eccttrriicca all