Mitsubishi Electric CITY MULTI CMB-P1016V-F, Руководство по обслуживанию

Страница: 131 / 183

- 130 -
4230
4240
Checking code Meaning, detection procedure Cause Check method & Countermeasure
Heat sink overheat protec-
tion
If the cooling fan stays ON
for 5 minutes or longer dur-
ing inverter operation, and
if THHS 95
°
C is detect-
ed.
Overload protection
The output current (Iac)
Imax(Amps) or THHS
85
°
C is detected continu-
ously for 10 minutes during
operation of the inverter.
Imax=27Amps
1) Power supply environ-
ment
Check the power supply volt-
age. Ensure that the power
supply voltage 342V across
all phases.
Check to make sure the air pas-
sage of the heat sink cooling is
not blocked.
Check the cooling fan wiring.
Check the cooling fan wiring.
Check the THHS sensor resist-
ance.
Check the THHS sensor resist-
ance.
3) Wiring defect
Ensure that the heat sink tem-
perature is 55
°
C or more and
that 220~240V is applied to the
inverter PCB connector CNFAN
when the inverter is on.
4) THHS failure
5) INV board fan output
failure
6) Cooling fan failure
4) Wiring defect
5) THHS failure
6) INV board fan output
failure
7) Cooling fan failure
8) Current sensor (ACCT)
failure
9) Inverter circuit failure
10) Compressor failure
Check the cooling fan operation
under the above operating con-
ditions.
Ensure that the heat sink tem-
perature is 55
°
C or more and
that 220~240V is applied to the
inverter PCB connector CNFAN
when the inverter is on.
Check the cooling fan operation
under the above operating con-
ditions.
Refer to
¶
[1] (7) 4)
"Current sensor ACCT"
Refer to
¶
[1] (7) 2) [4]
"Inverter damage check"
Check that the compressor has
not overheated during opera-
tion.
Check the refrigerant circuit
(oil return section). Replace
the compressor if there are
no problems with the refrig-
erant circuit.
7) IPM failure Refer to
¶
[1] (7) 2)
[2] "Check for compressor
ground fault or coil error"
[5] "Check for inverter circuit
trouble"
1) Air passage short cycle Ensure that a short cycle has
not occurred at the unit fan ex-
haust.
Check to make sure the air pas-
sage of the heat sink cooling is
not blocked.
2) Air passage blockage
Check if the power supply volt-
age 342V.
3) Power supply
2) Air passage blockage