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Control Functions
Protective Functions
(1) Reverse phase, loss of phase, abnormal high pressure, abnormal intermediate pressure, abnormal unit outlet
pressure
Stops the compressor.
(2) Discharge gas temperature anomaly
1) Normal operation
Compressor operation stops when the discharge gas temperature exceeds 118°C, and resumes when the
discharge gas temperature becomes 75°C.
2) When abnormal discharge gas temperature occurs 3 times in 2 hours.
Compressor is made to stop even the discharge gas temperature becomes 75°C.
For the method of resuming (resetting) compressor operation, refer to the "Explanations of Anomaly Alarm" in
"About Alarms."
(3) Refrigerant flood back alarm
When the difference (Superheat at suction) between "the suction gas temperature sensor value" and "evaporating
temperature converted from the low pressure" becomes 1 K or below for continuously 2 minutes, an alarm signal is
indicated. During such condition, compressor operation continues.
Alarm indication is canceled when the suction gas superheat exceeds 5 K.
(4) Sensor anomaly
1) Open condition of low pressure sensor, intermediate pressure sensor, high pressure sensor, unit outlet pressure
sensor
Compressor stops with an alarm indication.
For the method of resuming (resetting) compressor operation, refer to the "Explanations of Anomaly Alarm" in
"About Alarms"
2) Open condition of discharge gas temperature sensor, gas cooler outlet temperature sensor, split cycle outlet
temperature sensor, unit outlet temperature sensor, heatsink temperature sensor and ambient temperature sensor
Compressor stops with an alarm indication.
For the method of resuming (resetting) compressor operation, refer to the "Explanations of Anomaly Alarm" in
"About Alarms"
3) Open condition of suction gas temperature sensor
Alarm is indicated but the compressor continues operation.
Alarm is canceled when the sensor returns to normal, but the alarm (Red) LED maintains blinking condition.
(5) Controller communication anomaly
While communication continues with the controller (external communication refrigeration unit No. is other than 0 ), if
the controller data is not received for 10 minutes, then alarm is indicated. During such condition, compressor
operation continues.
Alarm is canceled when data reception from the controller is resumed.
When the external communication refrigeration unit No. is set to other than 0 without connecting
Caution
the controller, an alarm is displayed.
(6) Inverter anomaly
Compressor stops when the following occurs, and resumes operation in 1 minute later.
Compressor stops (does not resume) when an anomaly occurs 3 times per hour.
1) IPM protection
2) Voltage anomaly
3) Compressor over current (Protection stop with 44A)
4) Compressor out of tune
5) Current anomaly
(7) Inverter communication anomaly
When the inverter-PCB cannot receive data from the control PCB, compressor operation stops with alarm display.
For the method of resuming (resetting) compressor operation, refer to the "Explanations of Anomaly Alarm" in "About
Alarms"
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