INSTALLATION AND TROUBLESHOOTING INFORMATION FOR MODEL A31
PAGE 11 OF 15
F2 FUSE CLEARS
Defective A31 Oscillator/line sync. printed circuit board. (S2A-167)
F3 FUSE CLEARS
A.
AC bypass line, overload condition.
B.
Shorted SCR’s on static switch.
"READY" LED FOR THE PRE-CHARGE CIRCUITRY NOT LIGHTING
A.
Defective C2 capacitor.
B.
Bad LED.
C.
Bad connection to the S2A-172 Printed circuit board.
D.
No or low DC voltage input.
E.
ON/OFF switch in “ON” position.
F.
Shorted transistor modules.
G.
Shorted (C4) cap.
H.
Open pre-charge resistor.
UNITS’ AC LOAD CONTROLLED BY WRONG POWER SOURCE.
A.
Defective SCR module.
B.
Defective electric transfer switch.
C.
Defective static switch.
D.
Dip switches set incorrectly on S2A-160 printed circuit board
E.
Overload on prime source.
10.4 VOLTAGE TEST POINTS
Equipment Required:
DUAL TRACE OSCILLOSCOPE
Standard VOM
A31 Oscillator/Line sync. printed circuit board (S2A-167)
A.
DIPswitch 1,2,3, 4 must be in the open position.
B.1
Transistor Module Only
TS-1 from pin numbers 3 and 4, the two square waveforms must be zero to approximately 80
volt positive peaks (dual trace oscilloscope) on 48Vdc input units. On 24Vdc input units the two
square waveforms must be zero to approximately 40 volt positive peaks. On 120Vdc input units
the two square waveforms must be zero to approximately 120 volt positive peaks.
B.2
IGBT Module Only
TS-1 from pin numbers 3 and 4, the two square waveforms must be zero to approximately 80
volt positive peaks (dual trace oscilloscope) on 48Vdc input units. On 24Vdc input units the two
square waveforms must be zero to approximately 12 volt positive peaks. On 120Vdc input units
the two square waveforms must be zero to approximately 120 volt positive peaks.
C. TS-1 Pin Number 6 to the negative input terminal, you should read a 12 Volt square wavesignal.
D. TS-1, Pin Number 1 to Pin Number 2, you should read your DC input voltage. Pin Number 1 to
Pin Number 5 you should read your DC input voltage. Pin Number 1 is positive, Pin Number 2
and Pin Number 5 is negative.
E. TS-2 Pin Number 1 AC line bypass phase, Pin Number 2 AC line bypass Neutral. Pin Number 5 to
Pin Number 6, AC output voltage of the A31 Inverter (120Vac).
F.
LED 1, Phase lock LED, If two sources are insync. LED will light.
