Protection Control; Time Delay Safety Control; Total Running Current Control; Ipm (Power Transistor) Prevention Control - Panasonic CS-MRE7MKE Service Manual

15 Protection Control

15.1. Time delay safety control

• The compressor does not restart for 3 minutes after stop of compressor.

15.2. Total running current control

• When the air conditioner has been operated at the capacity designated by the indoor unit and the total running current exceeds
setting I1, the operating frequency of the compressor is reduced. Conversely, when the total current drops below setting I1, it is
increased (but only up to the capacity designated by the indoor unit).
• The compressor is stopped as soon as the total current exceeds setting I2.
• If the compressor is stop by the total running current control on 3 occasions in a 20-minutes period, the "F98" error is displayed.

15.3. IPM (Power transistor) prevention control

Overheating prevention control
• The compressor is stopped when the overheating protection circuit inside the IPM has been activated. It restarts after 3 minutes.
• Activation temperature: 110°C
DC peak current control
• When the inverter load current (DC peak current) exceeds the setting value (22.5A), the compressor is stopped immediately. If
this happens within 30 seconds after it started operating, it will restart one minute later; if it happens after 30 seconds have
elapsed since it started operating, it will restart 3 minutes later.
• If the DC peak current exceeds the setting value on 7 consecutive occasions within 30 seconds after the compressor started
operating, the "F99" error is displayed, and the unit operation is stopped.

15.4. Compressor Overheating Prevention Control

• When the compressor discharge temperature exceeds 105°C, compressor frequency control (including expansion valve control)
is conducted.
• If the compressor stops when compressor discharge temperature exceeds 112 C for 3 occasions within 30 minutes, TIMER LED
blinks (F97: Compressor overheat).
Model Setting
l1
Dry-Cooling
l2
l1
Heating
l2
Reset temperature: 95°C
CU-2RE15MBE CU-2RE18MBE
9.0A 9.0A
15.0A 15.0A
12.5A 12.5A
- 17.0A
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