Carrier 19EF Series, Start Up & Operation Manual

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• low cooler refrigerant temperature/pressure
• condenser high pressure or low pressure
• inadequate water/brine cooler and condenser flow
• high, low, or loss of voltage
• excessive motor acceleration time
• excessive starter transition time
• lack of motor current signal
• excessive motor amps
• excessive compressor surge
• temperature and transducer faults
Starter faults or optional protective devices within the starter
can shut down the machine. These devices are dependent on
what has been purchased as options.
If compressor motor overload or ground fault occurs,
check the motor for grounded or open phases before at-
tempting a restart.
If the controller initiates a safety shutdown, it displays the
fault on the LID with a primary and a secondary message,
and energizes an alarm relay in the starter and blinks the
alarm light on the control center. The alarm is stored in memory
and can be viewed in the PIC Alarm History table along with
a message for troubleshooting.
To give a better warning as to the operating condition of
the machine, the operator also can define alert limits on vari-
ous monitored inputs. Safety contact and alert limits are de-
fined in Table 3. Alarm and alert messages are listed in the
Troubleshooting Guide section, page 53.
SHUNT TRIP — The optional shunt trip function of the PIC
is a safety trip. The shunt trip is wired from an output on the
SMM to the motor circuit breaker. If the PIC tries to shut
down the compressor through normal shutdown procedure
but is unsuccessful for 30 seconds, the shunt trip output is
energized and causes the circuit breaker to trip. If ground
fault protection has been applied to the starter, the ground
fault trip will also energize the shunt trip to trip the circuit
breaker.
Table 3 — Protective Safety Limits and Control Settings
MONITORED PARAMETER LIMIT APPLICABLE COMMENTS
TEMPERATURE SENSORS
OUT OF RANGE
−40 to 245 F (−40 to 118.3 C) Must be outside range for 2 seconds
PRESSURE TRANSDUCERS
OUT OF RANGE
0.08 to 0.98 Voltage Ratio
Must be outside range for 2 seconds.
Ratio = Input Voltage ÷ Voltage Reference
COMPRESSOR DISCHARGE
TEMPERATURE
.
220 F (104.4 C) Preset, alert setting configurable
MOTOR WINDING TEMPERATURE
.
220 F (104.4 C) Preset, alert setting configurable
BEARING TEMPERATURE
.
220 F (104.4 C) Preset, alert setting configurable
EVAPORATOR REFRIGERANT
TEMPERATURE
,
33 F (for water chilling) (0.6° C)
Preset, configure chilled medium for water
(Service1 screen)
3 F (1.7° C) less than Design Refrigerant
Temperature (set point adjustable from
0 to 40 F [−18 to 4 C] for brine chilling) Configure chilled medium for brine (Service1
screen). Adjust brine refrigerant trippoint for
proper cutout
TRANSDUCER VOLTAGE
,
4.5 vdc
.
5.5 vdc Preset
CONDENSER PRESSURE — SWITCH
.
185 ± 7 psig (1276 ± 48 kPa),
reset at 120 ± 10 (827 ± 69 kPa)
Preset
— CONTROL
.
200 psig (1379 kPa) Preset
OIL PRESSURE
,
15 psid (103 kPad) Preset, alert setting preset at 15 psid (103 kPad)
LINE VOLTAGE — HIGH
.
110% for one minute
Preset, based on transformed line voltage
input to the Starter Management Module
— LOW
,
90% for one minute or
<
85% for 3 seconds
— SINGLE-CYCLE
,
50% for one cycle
COMPRESSOR MOTOR LOAD
.
110% for 30 seconds Preset
,
10% with compressor running Preset
.
10% with compressor off Preset
STARTER ACCELERATION TIME
(Determined by inrush current
going below 100% compressor
motor load)
.
45 seconds
For machines with reduced voltage mechanical
and solid state starters
.
10 seconds
For machines with full voltage starters
(Configured on Service1 screen)
STARTER TRANSITION
.
75 seconds Reduced voltage starters only
IMPELLER CLEARANCE
Displacement switch open
(bearing sensor −40 F [−40 C])
Thrust movement excessive
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