Veikong gpd 515/g5 Startup Manual page 233

C . Checking the Pulses at a VCM Motor
1 . Remove power from L1, L2, & L3 and wait for the CHARGE light to go out.
2 . Take apart the military style connector at the motor.
3 . Connect the common of the scope to pin F.
4 . Connect one channel of the scope to pin A. (If the scope is two channel, connect the
second channel to pin H.)
5 . Set the scope for 5V/div, 50ms/div, normal trigger, and rising edge trigger.
6 . Apply power to the drive, but do N O T apply a run command.
7 . Turn the motor shaft by hand. As Figure 6-1 shows, there should be pulses on both
channels, 50% duty cycle, and they should be the inverse of each other (separated by
180 electrical degrees).
8 . Disconnect the two scope channels, and reconnect them to pins B and I.
9 . Turn the motor shaft by hand. As Figure 6-1 shows, there should be pulses on both
channels, 50% duty cycle, and they should be the inverse of each other (separated by
180 electrical degrees).
10. If no pulses can be seen on any of the four pins (A, B, H, & I), check the power supply
between pins D and F. If it is not at or near 12VDC, check the power supply back at
the PG-X2 card on TA1 terminals 1 & 2. If the power supply is not good at TA1,
replace the PG-X2 card.
6-31