50
Table 5 — Protective Safety Limits and Control Settings (cont)
MONITORED
PARAMETER
ALARM
OR
ALERT
STATE
LIMIT COMMENTS
P Compressor
(Condenser Level)
- Condenser
Liquid Level
Low
169 COND_LEV < max (COND_LOV, 0.1) for
30*CONDTIME and COND_EXV < min Cond. EXV Min
Position + 5%
Preset Alert, configure in Setup5
- Condenser
Liquid Level
High
170 COND_LEV > min (COND_HIV, 4.9) for 30*CONDTIME
and COND_EXV>98%
Preset Alert, configure in Setup5
Power
- Line Frequency
Trip
222 47 Hz < LINE FREQUENCY < 63 Hz Preset Alarm
- Power Loss
214/148 DC BUS VOLTAGE<85% for Excessive Time Period Preset Alarm/Autorestart Alert
- Phase Reversal
226 Line power phases out of sequence Preset Alarm
Motor
- Stall
238 > 5 stall events within STALL TIME PERIOD Preset Alarm, Configure STALL DELTA% AMPS and
STALL TIME PERIOD in OPTIONS screen
- Current
Imbalance
225 MOTOR CURRENT IMBALANCE>MOTOR CURRENT
% IMBALANCE
Configure MOTOR CURRENT % IMBALANCE and
MOTOR CURRENT IMBAL TIME in VFD_CONF screen
- Rotation
Reversed
221 DISCHARGE PRESSURE decreases more than 2 PSI
after VFDSTART = TRUE
Preset Alarm, Must be outside -2 PSI limit for 5 consecu-
tive samples
- Overload Trip
217 Any LOAD CURRENT PHASE > 108% for Excessive
Time Period
Preset Alarm, Configure MOTOR LOAD ACTIVE
DEMAND LIMIT in MAINSTAT screen
- Excessive
Amps
208 PERCENT LOAD CURRENT > 110% for 30 sec. Preset Alarm
- Acceleration
Fault
203 PERCENT LOAD CURRENT > 95% at start-up and
VFDSTART = TRUE for 5 to 40 sec
Preset Alarm, PERCENT LOAD CURRENT = AVERAGE
LOAD CURRENT/MOTOR RATED LOAD AMPS
- Amps not
Sensed
202 PERCENT LOAD CURRENT < 5% and VFD
START=TRUE for 20 sec
Preset Alarm, PERCENT LOAD CURRENT = AVERAGE
LOAD CURRENT/MOTOR RATED LOAD AMPS
- Starts Limit
Exceeded
100 More than 8 starts in 12 hours Preset Prestart Alert
Low Chilled Liquid
Flow
229 CHILLED LIQUID FLOW = FALSE after CHILLED
LIQUID PUMP = ON & LIQUID FLOW VERIFY TIME
elapsed. CHILLED LIQUID DELTA P < EVAP FLOW
DELTA P CUTOUT or CALC EVAP SAT TEMP < EVAP
REFRIG TRIPPOINT or EVAPORATOR APPROACH >
EVAP APPROACH ALERT and EVAP REFRIG LIQUID
TEMP < EVAP REFRIG TRIPPOINT +1
Configurable Alarm, Configure LIQUID FLOW VERIFY
TIME in SETUP1 screen.
EVAPORATOR APPROACH = LEAVING CHILLED
LIQUID TEMP – EVAP REFRIG LIQUID TEMP
Low Cond Liquid
Flow
230 COND LIQUID FLOW = FALSE after COND LIQUID
PUMP = ON & LIQUID FLOW VERIFY TIME elapsed.
CONDENSER LIQUID DELTA P < COND FLOW DELTA
P CUTOUT or CONDENSER APPROACH >
CONDENSER APPROACH ALERT, or CONDENSER
PRESSURE > COND PRESS OVERRIDE + 5
Configurable Alarm, Configure LIQUID FLOW VERIFY
TIME in SETUP1 screen.
CONDENSER APPROACH = CONDENSER REFRIG
TEMP - LEAVING COND LIQUID TEMP
High Approach
- Evaporator
160 EVAPORATOR APPROACH > EVAP APPROACH
ALERT and VFD START = TRUE
Configure EVAP APPROACH ALERT in SETUP1 screen
EVAPORATOR APPROACH = LEAVING CHILLED
LIQUID TEMP – EVAP REFRIG LIQUID TEMP
- Condenser
161 CONDENSER APPROACH > COND APPROACH
ALERT and VFD START = TRUE
Configure COND APPROACH ALERT in SETUP1
screen.
VFD
- Speed Out of
Range
245 ACTUAL VFD SPEED < VFD SPEED OUTPUT – 10% or
ACTUAL VFD SPEED > VFD SPEED OUTPUT + 10%
Preset Alarm, Must be outside ± 10% range for 75 sec.
- Failure to Stop
204 PERCENT LOAD CURRENT >15% and VFDSTART =
NO for 20 sec
Preset Alarm, PERCENT LOAD CURRENT = AVERAGE
LOAD CURRENT/MOTOR RATED LOAD AMPS
- Communication
Failure
224 Communication with VFD lost for more than 10 sec Preset Alarm
Rectifier
- Overcurrent
241 RECTIFIER OVERCURRENT exceeded limit determined
by VFD
Preset Alarm
- High
Temperature
218 RECTIFIER TEMPERATURE >exceeds limit calculated
by VFD
Preset Alarm
101 RECTIFIER TEMPERATURE > RECTIFIER TEMP
OVERRIDE – 20 deg F (11.1 deg C)
Prestart Alert, Configure RECTIFIER TEMP OVERRIDE
in SETUP1 screen
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