VFD-B Series 
DELTA ELECTRONICS, INC. ALL RIGHTS RESERVED 
3-4
Figure 3 for models of VFD-B Series 20 HP and above
VFD150B23A/43A, VFD220B23A/43A, VFD300B23A/43A, 
VFD370B23A/43A, VFD450B43A, VFD550B43A, VFD750B43A
VFD185B23A/43A,
+1
Jumper
VFDB
-(minus sign)
DC chock
(optional)
Main circuit (power) terminals
Control circuit terminals
Shielded leads & Cable
Analog Multi-function Output
Te r m i n al
Factory default: Analog freq.
/ current meter 
0~10VDC/2mA
MO3
U(T1)
V(T2)
W(T3)
IM
3~
MO1
MO2
AFM
ACM
RA
RB
RC
MCM
RS-485
Motor
Factory default:
indicates during operation
48V50mA
Factory default:
Freq. Setting Indication
Factory default:
Low-voltage Indication
Multi-function 
Photocoulper Output
Analog Signal common
Serial interface
1: EV 2: GND 
5:NC 
6: for communication
3: SG- 
4: SG+ 
DFM
DCM
Digital Frequency Output
Te r m i n al
Factory default: 1:1 
Duty=50%
Digital Signal Common
48V50mA
48V50mA
E
E
Please refer to “Control
Terminal Explanation”.
6
1
AVI
ACI
AUI
ACM
4~20mA
-10~+10V
+10V
5K
3
2
1
Power supply
+10V 20mA
Master Frequency
0 to 10V 47K 
Analog Signal Common
E
FWD
REV
JOG
EF
MI1
MI2
MI3
MI4
MI6
TRG
MI5
DCM
+24V
Sw1
Sink
Source
Factory Default: 
SINK Mode
FWD/STOP
REV/STOP
JOG
E.F.
Multi-step 1
Multi-step 2
Multi-step 3
Multi-step 4
RESET
Accel/Decel prohibit
Counter
Digital Signal Common
Factory
default
* Don't apply the mains voltage directly
   to above terminals.
E
Please refer to Figure 4
for wiring of SINK
mode and SOURCE
mode.
R(L1)
S(L2)
T(L3)
Fuse/NFB(None Fuse Breaker)
SA
OFF
ON
MC
MC
RB
RC
+1
Recommended Circuit 
 when power supply 
is turned OFF by a 
fault output
R(L1)
S(L2)
T(L3)
E