(5) Auxiliary control power supply circuit
• To apply to inverters belonging to group A, C, or E shown in Table 3.3-3, connect the control power auxiliary
input (R0 and T0) through
insulating transformer or
the b contact of an electromagnetic contactor (52).
Fire may result.
Note:
The energy of the boosting reactor may obstruct the control power supply circuit through the source circuit
during converter operation, possibly causing an overheated or burned control power supply circuit. Be sure to
connect through insulating transformer or the b contact of the electromagnetic contactor (52) to the main power
supply.
The wiring pattern of the R0 and T0, R1 and T1 terminals to the inverter varies according to the applicable inverter.
As listed below, perform wiring according to the applicable inverter groups.
Table 3.3-3 Wiring Method to R0/T0/R1/T1 Terminal
Applicable inverter
R0 and T0 terminal wiring method
R1 and T1 terminal wiring method
FRN90SVG1S-69or above
Insert
insulating transformer or b
contact of the contactor (52) in the
wiring of R0 and T0.
Refer to the basic connection
diagrams given in Section 3.3.4.
The converter operates even if the power is not supplied to the control power supply auxiliary input (R0 and T0)
terminals. If the power supply electromagnetic contactor of the converter is turned off (with an open circuit) after the
protective circuit is activated, the control circuit of the converter is turned off, too, to stop alarm warning outputs
(30A, 30B and 30C) and cancel alarm display. To prevent this, supply the same AC voltage as that of the main circuit
power supply to the control power supply auxiliary input (R0 and T0) terminals.
• Precautions for application to non-grounded power supply
If the converter is connected to a non-grounded power supply, a grounding fault accident occurring at the inverter
output configures a routing circuit via the ground, causing breakage of the inverter.
To connect to the non-grounding power supply without possibility of breakage, connect an insulated transformer
between the power supply and R0 and T0 for each of the converter and inverter. In this case, there is no need to
insert the normally closed contact of 52 relay.
Connection of an insulated transformer is also recommended for an unknown power supply.
Choose the capacity of the transformer according to the capacity requirements of the converter and inverter, based on
the table below.
Model
Capacity of
transformer
Applicable converter
RHC
200VA
RHC132S-69DE
～
RHC450S-69DE
Model
Capacity of
transformer
Applicable inverter
SVG1
200VA
FRN90SVG1S-69E
～
FRN450SVG1S-69E
3-18
