13
3.3
Wire Size and Circuit Breaker Selection
3.3.1 Circuit Breaker Selection
WARNING:
To guarantee the safety of equipment, circuit disconnecting means and branch circuit
protection between power source and inverter is necessary. The branch circuit protection can either
be in the form of thermal magnetic moulded case circuit breaker (MCCB) or current limiting time
delay fuse protection. Please follow all national and local electric codes.
Units rated for 240VAC input are suitable for use on a circuit capable of delivering not more than
5000RMS symmetrical amperes, 240V maximum. Units rated for 480VAC input are suitable for
use on a circuit capable of delivering not more than 5000RMS symmetrical amperes, 480V maxi-
mum.
CAUTION:
DO NOT connect power source to inverter output terminal (T1, T2, T3) otherwise the
unit will be damaged.
NEVER install Magnetic Contactor (MC) between inverter output terminal and motor. The tran-
sient de-energizing surge of magnetic contactor will destroy the unit or lead inverter to trip.
Tables 3.3a and 3.3b shown below provides the suggested rating of MCCB or MC for each of the
inverter ratings.
You should install RC surge absorbers across the coils of any control relays or contactors installed
within the system of the inverter. Metal Oxide Varistors (MOV's) alone are not acceptable. See
figure below for the proper surge absorbers.
3.3.2 Wire Size
The wire used in the main power circuit should be sized according to Tables 3.3a and 3.3b shown
below. Use copper conductors only, size field wiring based on 75°C wire only.
Diode ratings
Current >=
Coil VA
Coil Voltage
Voltage >= 4 x Coil Voltage
120V
Coils
Drivecon
#
KVFCC-2
Table 3.3a CC-2XX Series
Inverter type
CC-207
CC-215
CC-222
CC-237
CC-255
CC-275
CC-2110
CC-2150
CC-2220
MCCB/ fuse rating
10A
20A
30A
40A
50A
80A
100A
150A
MC (A/B IEC rated)
100A09ND3
100A12ND3
100A18ND3
100A30ND3
100A38ND3
100A60ND3
100A75ND3
100B110ND3
Wire Size *1
(minimum)
TM1
14 AWG
12 AWG
10 AWG
8 AWG
6 AWG
4 AWG
2 AWG
TM2/TB1
18 AWG
Screw *2
Terminal size
TM1 (torque)
M4 (10.5 in.-lbs.)
M6 (39 in.-lbs.)
M6 (22 in.-
lbs.)
M8 (53in.-
lbs.)
M8 (53in.-
lbs.)
TM2 (torque)
M3 (7 in.-lbs.)
TB1 (torque)
Wire clamp type captive screw (10 in. - lbs.)