Checking Encoder Pulses - Veikong gpd 515/g5 Startup Manual

6.6

CHECKING ENCODER PULSES

In order to check the encoder pulses, an oscilloscope is needed. The pulses can be
checked after they have been processed by the PG-X2 card or at the motor.
The following tests require power to be applied to the drive while
the front cover is off.
prevent electric shock and damage to the equipment.
A . Checking Encoder Pulses at Test Points on the PG-X2 Card
1 . Remove power from L1, L2, & L3 and wait for the CHARGE light to go out.
2 . Connect the common of the oscilloscope to the test point labeled GND.
3 . Connect one channel of the scope to PA. (If the scope is two channel, connect the
second channel to PB).
4 . Set the scope for 2V/div, 50ms/div, normal trigger, and rising edge trigger.
5 . Apply power to the GPD 515, but do N O T apply a run command.
6 . Turn the motor shaft by hand. As Figure 6-1 shows, there should be pulses on both
channels at a +5V level, 50% duty cycle, and they should be separated by 90
electrical
degrees (half a pulse).
7 . If one or both channels do not have the correct pulses present (i.e. missing pulses,
incorrect duty cycle, improper voltage, etc.), go to procedure B.
B . C h e c k i n g t h e P u l s e s a t t h e I n p u t t o t h e P G - X 2 C a r d
1 . Remove power from L1, L2, & L3 and wait for the CHARGE light to go out.
2 . Connect the common of the scope to terminal 2 of TA1.
3 . Connect one channel of the scope to terminal 4 of TA1. (If the scope is two channel,
connect the second channel to terminal 5 of TA1.)
4 . Set the scope for 5V/div, 50ms/div, normal trigger, and rising edge trigger.
5 . Apply power to the drive, but do N O T apply a run command.
6 . 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).
7. Disconnect the two scope channels, and reconnect them to terminals 6 and 7 of TA1.
WARNING
Proper precautions should be taken to
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