gefran VDI100 Series Instruction Manual page 269

(3) PG detection setting (20-25 to 20-26)
a) When the inverter no longer received pulses fro, the PG feedback for the time specified in 20-26 a PG open
condition is detected.
b) PG open detection selection (20-25) specifies the stop method for the inverter in case of a PG open condi-
tion.
Refer to figure 4.4.117 for the PG fault detection block diagram.
(4) Set PG pulse (20-27)
a) Set PG of pulse number of the encoder for phase A or phase B for each cycle
b) If a gearbox is used between the motor and PG the gear ratio can be set with parameter 20-30 and 20-31.
There are two parameters referred as encoder pulse number: 17-07 and 20-27.
After 17-07 is entered,
- If auto tune is not executed, or not completed successfully, value of 17-07 will be overwritten by 20-27 auto-
matically.
- If auto tune is done successfully, 20-27 will be overwritten by 17-07.
(5) PG rotation direction (20-28)
Parameter is used to set the motor direction and PG direction. Make sure phase A or phase B is leading for
motor forward direction operation.
20-28=0: Forward operation, phase A is leading (phase B is leading for reversal operation).
20-28=1: Forward operation, phase B is leading (phase A is leading for reversal operation).
Motor direction is determined as below:
Forward: The motor direction is counter-clockwise when inverter runs in forward direction (see figure 4.4.119.)
Forward: The motor direction is clockwise when inverter runs in forward direction (see figure 4.4.120.)
Refer to the below figure 4.4.120 for PG feedback pulses.
VDI100 • Instruction manual
Figure 4.4.117 Logic diagram PG feedback failure detection
Duning momentary
power loss
During
Fout
B.B.
(after
+
ABSOLUTE
SFS)
-
20-23
Speed
feedback
(01-08)Fmin
0% SPEED
20% SPEED
20-20
Figure 4.4.118 PG and motor rotation direction
Inverter
(20-28= 0)
Forward
Command
CCW
Motor
(20-28= 1)
(Forward)
Figure 4.4.119 Motor operation direction
Inverter
Motor
DEV Det Time
20-24
+
-
+
-
PGO Det Time
20-26
+
-
OS Det Time
+
-
20-21
+
-
phase
{
A
phase
B
phase
{
A
phase
B
Forward
Command
CCW
(Forward)
DEV fault
PGO fault
OS fault
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