Alpha Technologies Spectra Series - Manual (Page 43)

Preliminary Operating Instructions 43 of 62 AIP SERVICE NUMBER 1-800-863-3364
CHARGER OUTPUT SYMPTOMS
Symptom Possible
Cause
Recommended Action
8) No charger
DC current. Defective A1
SCR Driver
board Verify both AC and DC breakers are ON. Verify AC and DC LEDs are on and
the display shows proper voltage. See other symptom if any of these are not
proper. Otherwise replace SCR driver board A1.
Bad connection
or open SCRs.
If the SCR driver board is good, check the internal charger connections or
check for an open SCR1. See SECTION 15.2.2 for procedure to determine if
the charger has an open SCR1.
9) Charger
output current
wrong. Bad S1 shunt Check S1 shunt connections, and make sure shunt not damaged. JE4-3 and
JE4-7 wires provide the SCR driver board output current sensing.
Defective A1
SCR Driver
board
A defective A1 SCR Driver board will not control the SCR firing pulses properly.
This could over charge the battery or allow the DC voltage to go too high.
Disconnect JE4 control cable from the SCR Driver board. With the charger
wired for normal operation, re energize the charger. If there is output current,
then the SCR may be bad. See Charger output uncontrollable symptom (#10).
10) Charger
output
uncontrollable. Leaky or full-on
SCR1 A leaky or full-on SCR1 will not allow the SCR Driver Board to control the
charger voltage or current. Disconnect both of the Brown SCR1 gate wires at
the SCR's. Restart the charger. If there is any measurable DC current, then at
least one of the SCR's is defective. It is recommended that both be replaced.
Defective A1
SCR Driver
board
If no problem is found, reconnect the cables, restart the charger, and verify if
the problem still exists. Replace the A1 SCR Driver board if the problem still
exists.
11) DC
Breaker CB2
(trips) OFF
after a few
minutes. Charger output
current wrong Turn the DC breaker back on and make note of the charger current on the
display. If output current on the display is wrong, go to that symptom (#9).
Bad connection
or part in DC
output circuit.
If output current on display is proper and the DC breaker still trips OFF, de-
energize the charger and check for a bad connection or part between the DC
terminal strip and the shunt causing the DC breaker to trip OFF. High DCrms
current or high temperature will cause the breaker to trip OFF.
Bad DC
breaker CB2.
If no other problem is found, replace the DC breaker CB2.
12) DC
Breaker CB2
(trips) OFF
immediately. Wrong DC
output wiring Turn the CB1 AC breaker off. Verify the DC output wiring is correct.
Shorted SCR1
Rectifier
Try to reset the CB2 DC breaker with AC breaker OFF. If it trips again, there is
a defective component in the output of the charger. See SECTION 15.2.1 of
the manual on SCR1 shorted or leaky to determine if you have a defective
SCR1.
Shorted
component in
the output
circuit.
With charger completely de-energized, measure the resistance from charger
positive to negative. It should start low and rise above 1K ohm because of the
capacitor in the charger. If the resistance is lower than 1K ohm, disconnect JE4
and JE5 cables from the SCR driver board. Disconnect necessary parts to
isolate them.