Hitachi SJ100 Series, Руководство по обслуживанию

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[4] IGBT Measurement
Resistance Measurement Allowable Value
From To
+ U 50kohm or more
+ V
+ W
U + 50 ohm or less
V +
W +
- U 50 ohm or less
- V
- W
U - 50kohm or more
V -
W -
If the result is out of its spec, replace the unit.
Please note that this cannot cover 100% to find IGBT failure because if the power devices in failure,
sometimes you can find the failure in components while they are activated. (You cannot find the failure
while they are not activated.)
[5] Cooling FAN voltage circuit in the ISPM (PV 24N)
Check
“
b92
”
is preset
“”
00 (FAN to be worked) and disconnect the cooling FAN
Resistance Measurement Allowable Value
From To
Pin(up) (Red) Pin(down) (Black) 20kohm or more
Pin(up) (Black) Pin(down) (Red) 50ohm or less
( relative check is important )
[6] Cooling FAN
Disconnect the cooling FAN and measure impedance of FAN circuit.
Resistance Measurement Allowable Value
From To
Red wire Black wire 50kohm or less
Black wire Red wire 100kohm or more
( relative check is important )
[7] BRD(RB,+,-)
Disconnect BRD resistor.
Red wire, Black wire mean tester
’
s wires.
Resistance Measurement Allowable Value Allowable Value
+ RB Diode drop V
Black wire Red wire 100kohm - 400kohm 0.3 – 0.5
Red wire Black wire 8ohm – 14ohm OL
(only reference)
Resistance Measurement Allowable Value Allowable Value
RB - Diode drop V
Black wire Red wire 100kohm – 700kohm OL(initial charge)
Red wire Black wire 2kohm – 4kohm OL
(only reference)
6-3/E
DC current detecting
resistor (shunt resistor)
(Order of mili ohm)
+
U
W
V
Rsh