Arrangement And Function Of Main Circuit Terminal Block - Omron M1 Series User Manual

*2. The molded case circuit breaker and earth leakage circuit breaker are also used for insulation from the inver-
ter's power supply. For this reason, install a magnetic contactor (MC) recommended for each inverter as re-
quired. When installing a magnetic contactor and solenoid or other coil near an inverter, connect surge ab-
sorbers in parallel.
*3. To enable a batch alarm signal when the protection function is activated even if the main power supply of the
inverter is cut off or to display the Digital Operator at all times, connect these terminals to the power supply.
(3G3M1-A2185 or later or 3G3M1-A4185 or later products) The inverter operates even when these terminals
are not connected to the power supply.
*4. When connecting the optional DC reactor (DCR), remove the short-circuit bar between the main circuit termi-
nals P1 and P(+) of the inverter before connecting.
When the capacity of the power transformer is 500 kVA or more and 10 times or more than the rated capacity
of the inverter, or when a thyristor load is connected, use a DC reactor (DCR).
*5. As a transistor for braking is built into the inverter, the braking resistor can be directly connected between P(+)
and DB.
*6. The terminal for grounding the motor. Connect this terminal, as required.
*7. Use twisted wire or shield wire for the control signal wire.
Generally, shield wire is grounded. However, when inductive noise from an external source is large, the influ-
ence of noise can sometimes be suppressed by connecting the shield wire to a DIC. Separate control signal
wire as far as possible (at least 10 cm is recommended) from the wiring of the main circuit, and do not pass
control signal wire through the same wiring duct. When wires cross, be sure to cross them so that they are
almost vertical to the wiring of the main circuit.
*8. This switch on the printed circuit board is for specifying the operation setting of the inverter. For details, refer
to 2-2-2 Terminal Blocks on page 2-8.
*9. Safety function terminals SF1 and SF2 are disabled at SW9 (double-pole switch) on the printed circuit board
before shipment from the factory. When using the SF1 and SF2 terminal functions, be sure to turn each SW9
switch OFF before connecting to these terminals.
*10. Cut off the molded case circuit breaker (MCCB) or magnetic contactor (MC) at the auxiliary contact (manual
reset) of the thermal relay.
*11.
and
2-3-2

Arrangement and Function of Main Circuit Terminal Block

The table below shows the arrangement of the main circuit terminal block and description of each ter-
minal.
Main Circuit Terminal Block
L1/L
L1/R
Terminal symbol
L1/R L1/L
L2/S
L3/T L2/N
U
V
W
M1 Series Standard Type User's Manual (I669)
are separated and insulated.
L2/N
P1 P(+) N(-)
L2/S L2/T
DB U V W
G G
Terminal name
Main power supply input terminal
Inverter output terminal
The terminal arrangement shown on the left
is an example for the inverters
with a capacity of 0.75 kW or lower.
Description
Connect the AC input power supply.
For single-phase 200-V type Inverters (3G3M1-
AB□□□), connect these to the L1/L and L2/N termi-
nals, respectively.
Connect a three-phase motor.
2 Design
2
2-11