Mitsubishi Heavy Industries ESA30E-25, Technical Manual

Page: 59 / 239

- -
'15 • HM-T-246
(3)-5 Low pressure protection control
() P rotection control
-
sor Hz is controlled to suppress the decrease of low pressure.
() Anomalous stop control
(a) Starting condition
If one of the following conditions is established;
①
Start condition A
Compressor is ON , and
Low pressure
≦
.0MP a is detected for 0 seconds continuously or low
pressure
≦
0.00MP a is detected for seconds continuously.
②
Start condition B
Compressor is OFF, and
Low pressure
≦
.0MP a is detected for 0 seconds continuously.
(b) Contents of control
①
Stop compressor and not permit to operate the unit.
②
If this anomalous stop happens times within 0 minutes, [E ] is displayed on the remote control and it becomes
error stop mode.
(c) E nding condition
If low pressure
≧
.MP a is detected for 0 seconds continuously.
(3)-6 Over-current protection control
() Current safe control
If the input current (at primary side) or the output current (at secondary side) of inverter on the heat pump water heater
exceeds the set value, compressor Hz is controlled to protect the inverter.
- Current safe control by inverter primary current.
(a) Starting condition
If all of the following conditions are established;
①
Compressor is ON
②
E xcept that the actual Hz is kept on decreasing or it is within second after the actual Hz decreased.
③
Inverter primary current
≧
current safe value (A)
(b) E nding condition
①
Inverter primary current
≦
current safe value (0A) for minutes continuously.
②
Inverter primary current
＜
current safe value (A) for minutes continuously.
(c) Contents of control
Release
Reduce Hz for every 0 seconds
.MP a
Low pressure (LP )
Reduce Hz for every second
Retain
Start value Release value
Release
Inverter current (A)
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