EM330D User Manual
A Special Purpose Inverter for Hoisting
19
3.2.2
Main Circuit Terminal Functions
The main circuit terminal functions of EM330D are listed in Table 3-1. Wire the
terminals correctly as per corresponding function.
Table 3-1 Main Circuit Terminal Functions
Terminal
Function
R, S, T
AC power input terminals for connecting to 3-phase AC power.
U, V, W
Inverter AC output terminals for connecting to 3-phase induction motor.
Positive and negative terminals of internal DC bus for connecting to outer
braking unit.
, PB
Connecting terminals of braking resistor, one end connected to
and the
other to PB.
Grounding terminals
3.2.3
Standard Wiring of Main Circuit
See Figure 3-3 for standard wiring of main circuit.
With an Integrated Braking Unit
External
Braking Resistor
PB
M
U
V
W
T
S
R
Without an Integrated Braking Unit
External Braking Resistor
External Braking Unit
M
U
V
W
T
S
R
Figure 3-3 Standard Wiring of Main Circuit
3.2.4
Wiring Main Circuit on Input Side
Installing a Circuit Breaker
Always install an air circuit breaker (MCCB) between the power supply and input
terminals.
●
Choose a MCCB with a capacity of 1.5-2 times of the inverter air circuit.
●
The time characteristics of MCCB should meet that of inverter’s overheating
protection (150% of rated current /1minute).
