gefran VDI100 Series

(3) PG detection setting (20-25 to 20-26)
a) When the inverter no longer received pulses fro, the PG feedback for the time specied in 20-26 a PG open
condition is detected.
b) PG open detection selection (20-25) species the stop method for the inverter in case of a PG open condi-
tion.
Refer to gure 4.4.117 for the PG fault detection block diagram.
Figure4.4.117LogicdiagramPGfeedbackfailuredetection
ABSOLUTE
+
-
+
-
+
-
+
-
+
-
20-24
20-26
20-21
Fout
(after
SFS)
Speed
feedback
+
-
20-23
Duning momentary
power loss
During
B.B.
(01-08)Fmin
0% SPEED
20% SPEED
20-20
DEV Det Time
PGO Det Time
OS Det Time
DEV fault
PGO fault
OS fault
(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).
Figure4.4.118PGandmotorrotationdirection
Inverter
Motor
Forward
Command
CCW
(Forward)
phase
A
phase
B
phase
A
phase
B
{
{
(20-28= 0)
(20-28= 1)
Motor direction is determined as below:
Forward: The motor direction is counter-clockwise when inverter runs in forward direction (see gure 4.4.119.)
Figure4.4.119Motoroperationdirection
Inverter
Motor
Forward
Command
CCW
(Forward)
Forward: The motor direction is clockwise when inverter runs in forward direction (see gure 4.4.120.)
Refer to the below gure 4.4.120 for PG feedback pulses.
VDI100 • Instruction manual 269