York YZ MODEL A, Руководство по эксплуатации и обслуживанию

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JOHNSON CONTROLS
105
SECTION 3 - OPTIVIEW™ CONTROL CENTER FUNCTIONS AND NAVIGATION
FORM 161.01-OM1
ISSUE DATE: 6/8/2018
3
MESSAGE DESCRIPTION
VSD – 105% MOTOR
CURRENT OVERLOAD
The drive logic board generates this shutdown by reading the current from the 3 output cur-
rent transformers. The shutdown is generated when the drive logic board has detected that the
highest of the three output phase currents has exceeded 105% of the programmed 100% full
load amps (FLA) value for more than 40 seconds. This shutdown requires a manual reset via the
Reset push-button on the drive logic board.
VSD – High Converter
Heatsink Temperature
A thermistor sensor is located on the copper chill plate of the drive Power Unit. If at any time this
thermistor detects a temperature of 170°F (77°C) or higher a shutdown will occur. The cooling
fans and coolant pump/s on the drive will continue to run after the shutdown until the thermistor
temperature has dropped below 160°F (71°C).
VSD – High Phase A
(B or C) Inverter
Baseplate Temperature
A thermistor sensor is located inside the transistor module on the drive power unit. If at any time
this thermistor detects a temperature of 190°F (88°C) or higher a shutdown will occur. The cool-
ing fans and coolant pump on the pump/s on the drive will continue to run after the shutdown
until the thermistor temperature has dropped below 165°F (74°C).
VSD – INPUT
CURRENT OVERLOAD
The input RMS currents are monitored and compared against 105% of the job input current
per the following table. If this value is exceeded continuously for 10 seconds, this shutdown is
generated. When the condition clears, the chiller can be started after the CLEAR FAULTS key is
pressed.
VSD MODEL
BREAKER RATING
(AMPS)
MAX VSD INPUT
CURRENT (AMPS)
(BREAKER RAT-
ING/1.05)
INPUT CURRENT
OVERLOAD TRIP
LEVEL (AMPS)
330A 240 228 Input Job FLA*1.05
420A 400 380 Input Job FLA*1.05
780A
600 571 Input Job FLA*1.05
1020A 800 761 Input Job FLA*1.05
1280A 1200 1142 Input Job FLA*1.05
VSD – MOTOR
CURRENT IMBALANCE
The three phase compressor motor current imbalance was greater than 30% continuously for 45
seconds. The imbalance is not checked until the chiller has been running for at least 45 seconds
and the average of the three phases of motor current is greater than 80% of the programmed
100% chiller Full Load Amps. The average is calculated as: Iave = (Ia+Ib+Ic) / 3. The imbalance
is calculated as: ((Ia-Iave) + (Ib-Iave) + (Ic-Iave) x 100)/2(lave).
The Variable Speed Drive detects the unbalance condition and advise the OptiView control cen-
ter Microboard via serial communications. The chiller can be started after the CLEAR faults key
is pressed.
VSD – PRECHARGE
LOCKOUT
If the drive fails to meet the pre-charge criteria (refer to pre-charge faults), the pre-charge circuit
will wait for a period of 10 seconds before another pre-charge attempt. The unit’s cooling fans
and coolant pump/s shall remain energized during this time period. Following this 10-second pe-
riod, the pre-charge shall again be initiated. The unit shall attempt to meet the pre-charge criteria
three consecutive times before the drive will shutdown, lockout, and display this message.
HARMONIC FILTER –
HIGH BASEPLATE
TEMPERATURE
A thermistor sensor is located inside the transistor module on the harmonic filter power unit. If at
any time this thermistor detects a temperature higher then the threshold value a shutdown will
occur. Refer to the chart below for the shutdown threshold values. A manual reset is required by
pressing the “Overtemp Reset” pushbutton located on the Filter Logic board.
VSD MODEL THRESHOLD SHUTDOWN VALVE
330A/420A 175° F (79° C)
780A 190° F (88° C)
1020A/1280A 171° F (77° C)
TABLE 12 - SAFETY SHUTDOWN MESSAGES (CONT'D)