Remote Start/Stop Controls; Spare Safety And Spare Temperature Inputs; Alarm (Trip) Output Contacts - Carrier 19XRV Start-Up, Operation And Maintenance Instructions Manual

OVERRIDE CONDITION FIRST STAGE SET POINT
View/Modify on
ICVC Screen
High Condenser Pressure SETUP1
(COND PRESS
OVERRIDE)
High Motor Temperature SETUP1
(COMP MOTOR TEMP
OVERRIDE)
Low Evaporator SETUP1
Temperature (REFRIG
OVERRIDE DELTA T)
High Compressor Lift OPTIONS
(SURGE/HGBP DELTA
T,P)
Manual Guide Vane Target COMPRESS
(TARGET GUIDE VANE
POS)
Manual Speed Control COMPRESS
(TARGET VFD SPEED)
Motor Load MAINSTAT
(ACTIVE DEMAND LIMIT)
Low Discharge Superheat OVERRIDE
High Rectifier Temperature SETUP1
(RECTIFIER TEMP
OVERRIDE)
High Inverter Temperature SETUP1
(INVERTER TEMP
OVERRIDE)

5.12 - Remote start/stop controls

A remote device, such as a timeclock that uses a set of con-
tacts, may be used to start and stop the chiller. However,
the device should not be programmed to start and stop the
chiller in excess of  or 3 times every 1 hours. If more than 8
starts in 1 hours (the STARTS IN 12 HOURS parameter
on the MAINSTAT screen) occur, (not counting either
recycle restarts or auto. restarts after power failure) an
excessive starts alarm displays, preventing the chiller from
starting. The operator must press the ReSet softkey on the
ICVC to override the starts counter and start the chiller. If
the chiller records 1 starts (excluding recycle starts) in a
sliding 1-hour period, it can be restarted only by pressing
the ReSet softkey followed by the LoCAL or CCn soft-
key. This ensures that, if the automatic system is malfunction-
ing, the chiller will not repeatedly cycle on and off. If the
AUTO RESTART OPTION in the OPTIONS screen and
the REMOTE CONTACTS OPTION are enabled, the
REMOTE CONTACTS must be closed in order for the
chiller to restart following a power failure. If the automatic
restart after a power failure option (AUTO RESTART
OPTION on the OPTIONS screen) is not activated when
a power failure occurs, and if the remote contact is closed,
the chiller will indicate an alarm because of the loss of
voltage.
The contacts for remote start are wired into terminals 3 and
4 of the low voltage terminal strip in the VFD enclosure.
See the certified drawings for further details on contact
ratings. The contacts must have 4 V a.c. dry contact rating.
40
Table 6 - Capacity overrides
SECOND STAGE SET POINT
Override Default Value Configurable Range Value
CONDENSER 621 to 1138 kPa
PRESSURE >862 kPa
COMP MOTOR WINDING 66 to 93°C
TEMP
> 93°C
EVAPORATOR REFRIG 1.1 to 2.8°C
TEMP < EVAP REFRIG
TRIPPOINT + 1.7 K
Min T1: 0.8 K 0.3 - 1.1 K
Min P1: 345 kPa 207 - 1172 kPa
Max T2: 5.6 K 0.3 - 11.1 K
Max P2: 586 kPa 345 - 1172 kPa
Automatic 0 to 100%
Automatic VFD MINIMUM
SPEED to 100%
Automatic 40 to 100%
ACTUAL SUPER¬HEAT < None
SUPERHEAT REQUIRED
for conditions
RECTIFIER 68 to 77°C
TEMPERATURE > 71°C
INVERTER 68 to 77°C
TEMPERATURE > 71°C
CONDENSER PRESSURE > COND
PRESS OVERRIDE + 16.5 kPA
COMP MOTOR WINDING TEMP >
COMP MOTOR TEMP OVERRIDE
+ 5.6 K
EVAPORATOR REFRIG TEMP <
EVAP REF OVERRIDE TEMP - 0.6 K
NOTE: EVAP REF OVERRIDE
TEMP = EVAP REFRIG TRIPPOINT
+ REFRIG OVERRIDE DELTA T
None
None
Forced TARGET VFD SPEED
cannot override either a capacity
inhibit or a capacity decrease
command generated by the PIC III
ACTIVE DEMAND LIMIT
> Set Point + 5%
ACTUAL SUPERHEAT <
SUPERHEAT REQUIRED – 0.7 K
RECTIFIER TEMP > RECTIFIER
TEMP OVERRIDE + 5.6 K
INVERTER TEMP > INVERTER
TEMP OVERRIDE+ 5.6 K

5.13 - Spare safety and spare temperature inputs

Normally closed (NC) discrete inputs for additional field-
supplied safeties may be wired to the spare protective
limits input channel in place of the factory-installed
jumper on terminals 19 and 0 of the low voltage terminal
strip. The opening of any contact will result in a safety
shutdown and a display on the ICVC. Refer to the certified
drawings for safety contact ratings.
Extra analogue temperature sensors may also be added to
the CCM module (SPARE TEMPERATURE #1 and
SPARE TEMPERATURE #) at terminals J4 5-6 and
J4 7-8, respectively. The analogue temperature sensors may
be configured in the EQUIPMENT SERVICE/SETUP1
table to cause an alert (Enable value 1 or ) or alarm
(Enable value 3 or 4), or neither (Enable value 0). An alarm
will shut down a running chiller, but an alert will not. The
fault condition will be triggered when crossing a high limit
(Enable value  or 4) or low limit (Enable value 1 or 3),
configurable between -40°C to 118°C. The spare temperature
sensors are readable on the CCN network. They also have
specific uses as common temperature sensors in a Lead/Lag
system. See page 44.

5.14 - Alarm (trip) output contacts

One set of alarm contacts is provided in the VFD. The
contact ratings are provided in the certified drawings. The
contacts are located on terminals 9 and 10 of the TB field
wiring terminal strip in the VFD enclosure.
OVERRIDE TERMINATION
Value
CONDENSER PRESSURE <
CONDENSER PRESS
OVERRIDE – 6.9 kPa
COMPR MOTOR WINDING
TEMP < COMP MOTOR
TEMP OVERRIDE –1.1 K
EVAP REFRIG TEMP > EVAP
REF OVERRIDE TEMP + 1.1 K
ACTIVE DELTA T > SURGE/
HGBP DELTA T + SURGE/
HGBP DEADBAND
Press RELEASE softkey after
selecting TARGET GUIDE
VANE POS
Press RELEASE softkey after
selecting TARGET VFD
SPEED
ACTIVE DEMAND LIMIT < Set
Point – 2%
ACTUAL SUPERHEAT >
SUPERHEAT REQUIRED +
0.56 K
RECTIFIER TEMP <
RECTIFIER TEMP
OVERRIDE – 2.8 K
INVERTER TEMP <
INVERTER TEMP OVERRIDE
– 2.8 K