SERVICING THE AT10.1
52
SYMPTOM
PROBABLE
CAUSE
RECOMMENDED ACTION
Front panel is
dead, but ac
& dc voltages
are present at
TB1(+/-)
1. Control pc
boards
(A1/A11) not
connected
2. Defective
Main Control
PC Board (A1)
3. Defective
wiring
1. Confirm the
Gate Driver PC B
oard (A11-P17) is firmly
connected to the Main Control PC Board (A1-J17). Confirm
the signal harness plug is firmly inserted into the
Gate Driver
PC Board
connector (J18).
2. If the green
AC ON
indicator is lit, but the rest of the front
panel display is dead, replace the Main Control PC Board
(A1).
3. Check the harness wiring to the Gate Driver PC Board
connector (A11-J18), for signs of insulation damage, burns,
etc. Confirm all wires are securely crimped in the connector.
Front panel
dies during ac
power failure,
but dc voltage
is present at
TB1(+/-)
1. Defective
Power Supply
Ballast Resistor
(R3)
2. Defective
wiring
1. Use a dc voltmeter to measure voltage from TB1(-) to J1 pin
#
8
on the Main Control PC Board (A1). It is normally 12 Vdc
when the rated dc output voltage is present at TB1(+/-).
If it is
not
12 Vdc, remove all power from the AT10.1 and
measure the resistance of R3, from TB1(+) to J1 pin #
8
. See
the table in Section 3.6 for the proper resistance value. If the
resistance is not within 10% of the table value, replace R3.
2. Remove the clear safety shield. Check the wiring to and
from TB1 and the Main Control PC Board (A1) for signs of
insulation damage or burns. Repair any damaged wiring.
AT10.1
output
voltage too
high, or not
controllable
1. Defective
SCR
2. Defective or
wrong value
scaling resistor
(R4 or R14)
3. Defective
temperature
compensation
probe (optional)
4. Defective
Main Control
PC Board (A1)
1. Disconnect the twisted pair wires #
51/52
and #
53/54
from
the SCR (Q1/Q2) gate lead terminals. Note the original
polarity so wires can be replaced with the same orientation.
Restart the AT10.1. If you are able to measure output current,
one of the SCRs is defective. Replace SCR modules (Q1/Q2)
as needed.
2. On the back of the front panel, locate R4 and R14 on the
Gate Driver PC Board (A11). Remove one end of each
resistor and measure its value with an Ohmmeter. Refer to
the table in Section 3.6 for values. If either resistor is not
within 1% of the specified value, replace the scaling resistors
(R4 and/or R14) as needed.
3. Remove the leads from the probe and measure its
resistance. At 77 °F / 25 °C the resistance should be about
10,000
Ω
. If it is not, replace the probe assembly (A10).
4. If the front panel meter displays more than 110% of the
AT10.1 rated dc current, the Main Control PC Board (A1) may
be defective. Unplug the system harness connector (J18) from
the Gate Driver PC Board (A11). If the output current drops to
zero (Adc), replace the Main Control PC Board (A1).
Содержание AT10.1 SERIES
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