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.)
To Next Page
Loading...