Mitsubishi Heavy Industries ESA30E-25, Technical Manual

Page: 60 / 239

- -
'15 • HM-T-246
- Current safe control by inverter secondary 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 secondary current
≧
current safe value (A)
(b) E nding condition
③
Inverter secondary current
≦
current safe value (A) for minutes continuously.
④
Inverter secondary current
＜
current safe value (A) for minutes continuously.
(c) Contents of control
Same as that for the current safe control by inverter primary current
() Inverter anomaly (Current cut)
When the current cut signal received from inverter P CB, compressor is stopped.
If one of following condition is established, [E ] is displayed on the remote control and it becomes error stop mode.
①
If the current cut signal is detected times within minutes
②
If compressor speed
≧
0rps, and the current cut stop are detected times within 0 minutes.
(3)-7 Power transistor temperature protection control
() P rotection control
Hz is controlled to suppress the rise in power transistor temp.
() Anomalous stop control
(a) If the power transistor temperature increases further, the protection switch in the power transistor activates and compressor
is stopped.
(b) If this anomalous stop happens times within 0 minutes, [E ] is displayed on the remote control and it becomes error
stop mode.
(c) If this anomaly is detected for minutes continuously, [E ] is displayed on the remote control and it becomes error stop
mode.
(3)-8 Under-dome temperature protection control
Hz is controlled to suppress the rise in under-dome temperature.
Reduce Hz for every 0 seconds
Retain
Release
℃ ℃
P ower transistor temperature (Tho-P )
Reduce Hz for every seconds
Retain
Release
0
℃ ℃
Under-dome temperature (Tho-D)
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