User's Manual

41
A2U15-10 cycle power transition lo to hi at 2.9 sec
(
FAULTAC )
A2Q7-C cycle power transition 5.0 to 0.3Vdc at 2.5 sec
(
ENABLERELAY )
* NODE ( - ) = A2J7-4
Troubleshooting PWM & Clock
The inputs to inhibit Gate A2U18A and PWM gate A2U18B are the keys to PWM troubleshooting. The 20KHz clock starts
each PWM output pulse, and the pulse stops when any of the inputs to A2U18A or A2U18B goes low. The PWM is
inhibited and prevented from initiating output pulses as long as any of the seven inputs is low.
Circuit Included. Pulse Width Modulator (PWM), Off-Pulse Oneshot, On-Pulse one-Shot, 20KHz Clock.
Setup. The Main Troubleshooting Setup, page 33. Apply the ac mains voltage to the isolation transformer. Adjust the units
current setting above 1.0Adc. Set the external supply (EXTERNAL) and adjust the unit's voltage setting (INTERNAL) as
instructed below. Use the "DISPLAY SETTINGS" switch to make adjustments to the unit's current or voltage setting.
Inputs:
NODE ( - ) = A2J7-4
NODE ( + ) SETUP MEASUREMENT SOURCE
A2J7-24 5.0Vdc A2Q9, A2W3
A2U18-10 hi A2U15-10
A2U18-12 hi A2U15-13
A2U18-13 hi A5TS1, A4TS1
A2U18-5 hi A2U18-8
A2U18-2 hi A2U8-2
A2U18-1 Set OUTPUT ADJUST
for 1Vdc
hi A2U10-7
Outputs:
SET VOLTAGE (Vdc)
NODE ( + ) EXTERNAL INTERNAL MEASUREMENT
A2U20-1 0 0 TTL sq wave, 320KHz
A2U20-5 0 0 TTL sq wave, 40KHz (80KHz, 6015A)
A2U20-6 0 0 TTL sq wave, 20KHz
A2U19-5 0 2 20KHz
A2U19-6 0 2 20KHz
A2U16-5 40 2
10
µs pulse, 20KHz
A2U16-5 40 0 lo
A2U16-4 40 20
48
µs pulse, 20KHz
A2U16-4 40 0 hi
A2U15-1 40 20
1.7
µs pulse, 20KHz (80Vdc, 6015A)
A2U15-1 40 0 lo
+ OUT 40 20
≈ 40Vdc (UNREGULATED)
14Vdc (6011A, 6012B)
80Vdc (6015A)
+ OUT 40 2 20Vdc (CV)
2.0Vdc (6011A, 6012B, 6015A)