V/F Control - Toshiba T300MV2 Instruction Manual

CIRCUIT OPERATION (cont'd)

V/f Control

(1) Frequency reference (F_P)
The frequency reference is determined by the speed reference signal (SP_R) and the slip
frequency, when slip compensation is used.
The frequency is compensated by the change of the Q axis current for the control stability.
(2) Q axis voltage reference (EQ_R)
The Q axis voltage reference is proportional to the frequency reference and flux reference.
This voltage may be compensated by the Q axis current for auto torque boost, when advanced V/f control is
used. The V/f rate can be changed by the selected V/f pattern.
The Q axis voltage is compensated by the change of the D axis current for the control stability.
(3) D axis voltage reference (ED_R)
The D axis voltage reference is used for low speed torque boost normally. This voltage can also be
compensated based upon Q axis current, when advance V/f control is used.
VF_STL_P
Stall
VF_STL_W1
prevention
VF_LMT_STL
control
VF_FLT_STL
VF_STLPOINT
VF_STLCMP
Speed -
+
reference
SP_R
Frequency
IQ_F
stabilization
control
VF_FCMP_A
VF_FCMP_AT
Slip
frequency
VF_WSCMP_EN
CS_MOTOR_RPM
IF08CZ10 April, 2019
+ +
F_P
−
+
Flux reference
FL_R
VF_FCMP
CS_KS_FAI
CS_SP_BASE
FLT_FLX
VF_WSCMP
- 48 -
Voltage
ID_F
stabilization
control
VF_DVCMP_A, VF_DVCMP_AT
VF_DVCMP_GAIN, VF_DVCMP_LSP
+ V/f
pattern
+
CS_VF_MODE
CS_VF_CURVE
CS_FP1 ~ 5
CS_VP1 ~ 5
(Advancced V/f)
Automatic
Torque
+
boost
MI_ID_BASE
+
MI_R1_SET
MI_L_CMP
VF_TRQBST_GAIN
VF_SP_TRQBST
(Simple V/f)
Start torque
boost
VF_LSP_VBST
VF_LSP_VBSTSP
VF_DVCMP
+ -
EQ_R
+
+
Overcurrent
VF_CP_ILIM
control
VF_FLT_ILIM
+
Modulation
ratio
Modulation
ratio
ED_R