Enerpro Document No: OP-0106, Rev. B
Page 6 of 14
ECO #19-11089; Release Date: 08/02/2019
12.4. Energize the mains voltage. Ensure that PD2, the power on LED, illuminates.
12.5. Verify the presence of regulated 12 Vdc ± 5% at J4-6 and regulated 5 Vdc ±5% at J4-7
with a multimeter.
12.6. Enable firing via the enable commands and bring SIG HI slightly above 0.5 Vdc. Ensure
that the INHIBIT LED, PD1, extinguishes.
12.7. Adjust the BIAS (R6) and SPAN (R7) potentiometers to achieve the required delay angle
command signal response (see Section 5 of this document).
12.8. Observe the voltage at TP7 to verify that the PLL is in lock. The TP7 voltage should be
(+/-.5V) centered at 5 Vdc with a variable amount of ripple dependent on the SIG HI signal. The
TP7 ripple will be at its minimum value at the minimum and maximum SIG HI voltages, as in
Figures 4 and 5, respectively. The TP7 ripple will be at its maximum value when the delay angle
command is near α = 90° as in Figure 6. Sweep the SIG HI voltage over the full range to ensure
that the average voltage does not deviate from 5 Vdc.
Figure 4
VCO control voltage and phase detector waveform, SIG HI = 5.0 Vdc
Channel 1: TP6
Channel 2: TP7
Figure 5
VCO control voltage and phase detector waveform, SIG HI = 0.5 Vdc
Channel 1: TP6
Channel 2: TP7
