Toshiba T300MV2 - Control Circuit for SM (Synchronous Motor) Control

IF08CZ10 April, 2019 - 49 -
CIRCUIT OPERATION (cont’d)
Control Circuit for SM (Synchronous Motor) control
(1)Interface
SM control requires the use of an exciter. The exciter may be internal or external to the drive. The
interface to the exciter is shown below.
(2) Timing chart
There are 3 control modes.
Mode1 ”Initial position detection” : Initial position is detected when the motor is stopped.
Mode2 “Constant IQ starting”: This mode starts the motor without speed control. It uses the initial position
and current control with pre-set speed reference rate and current.
Mode3 “ZPS control” (zero-PS): Speed and phase angle are estimated by the motor voltage PLL. Once the
drive enters this mode it is in speed control and will follow the external speed reference.
0%
0%
0%
0%
MS_PLL_SW_SP
0PS Switch Speed
time
Field current
Stator current
I1_F
FC_FBK
Armature voltage
MAIN_VAC_F
Speed
SP_F
Mode3 : 0PS Control
Constant IQ
Acceleration
Initial position detection
MS_START_IQ
MS_FCR_INI
MS_FCR_IQACC
MS_CR_RATE
CR_RATE_ACC
LMT_SP_MIN
Operation lowest speed
Mode1 :
Mode2 :
B_FL_CMD
For protection
(Option)
1.0/100%
FC_REF
Field on/off command
Field current reference
DO
A
OUT
Required
Field current feedback
1.0/100%
FC_FBK
FL_FOC
FL_READY
FL_RNTD
FL_FAULT
Drive
For protection
(Option)
Exciter
Field over current
Exciter Ready
Exciter Run
Exciter failure
DI
A
IN