GE VAT300 Series Quick Manual page 15

(Note 8) Inverter output
a) Do not insert a power factor improvement capacitor on the output side of the inverter.
b) When inserting a magnetic contactor on the output side of the inverter, prepare a sequence
control circuit so that the magnetic contactor will not open and close when the inverter runs.
c) Directly connect the motor to the inverter's load. Do not connect other devices such a transformer
or Slidac, etc.
(Note 9) Grounding
Always ground the inverter unit grounding terminal and the ground. Ground according to the
regulations of the country where the inverter is being used.
(Note 10) Inverter output surge voltage (For 400V series)
If the wiring between the inverter and motor is long (40m or more), the surge voltage applied on the
motor will increase, and the motor insulation could deteriorate. In this case, lower the carrier frequency
as low as possible (4kHz or less), and use a motor with reinforced insulation for inverter drive, or
connect a surge absorber dedicated for the inverter output.
(Note 11) DCL
Always short circuit across L+1 and L+2 when not using the DCL. (Factory setting state)
When connecting the optional DCL, connect it to L+1 and L+2.
Always remove the short-circuit bar at this time.
Twist the wiring to DCL, and keep it as short as possible.
(Note 12) DB (Dynamic Braking) unit (N022K0, X030K0 or more)
When connecting the optional DB unit, follow Fig. 2-3-a (b) (c) and connect the L+2 and L–.
The DB unit and inverter unit will both be damaged if the connection is incorrect.
Twist the wiring to the DB unit, and keep it as short as possible (3m or less).
Refer to Section 7-3 of PCST-3450 for details.
(Note 13) DB resistor protection
When using the thermal relay(76D) or the optional DB unit, use the overload detection reply of the DB
unit in order to protect the DB unit and the inverter unit. For the details, please refer to section 7-3 of
PCST-3450.
(Note 14) Installation of surge absorber
Install a surge absorber on the magnetic contactor and relay coils installed near the inverter.
(Note 15) L- terminal
N015K0,N018K5,X018K0 and X022K0 doesn't mount L- terminal.
2-4 Precautions for wiring to the control signal
(1) When wiring (control circuit wiring) to the control terminal block, separate the main circuit wiring
(terminals L1, L2, L3, L+1, L+2, L–, B, U, V, W) and the other drive wires and power wires. Do not
place the wires in the same conduit, lay them in parallel or bundle them, etc.
(2) Use a 0.13 to 0.8mm² wire for wiring to the control circuit.
In this case, tighten TB1 and TB2 with a 0.6N·m tightening torque.
The TB3 tightening torque must be 0.25N·m.
(3) The length of the sequence input/output contact wire must be 30m or less.
(4) The sequence output PSO3 can output the pulse output (max.: 6kHz) by changing DS1-4 and
setting the pulse output.
When using the speed detection option, do not set the pulse output if using the pulse output
function provided with the option.
(5) Use a twisted pair wire or twisted pair shield wire for wiring to the analog signal circuit such as the
setters and meter. (Refer to Fig. 2-4-a.) Connect the shield wire to the TB1 COM terminal of the
VAT300.
The wire length must be 30m or less.
(6) The analog output is dedicated for the indicators such as the speedometer and ammeter.
It cannot be used for control signals such as the feedback control.
(7) RY24 and RY0 are designed exclusively for the drive's internal sequence circuits.
These are not designed to supply power to any external devices.
(8) After wiring, always check the mutual wiring.
At this time do not carry out a megger check or buzzer check on the control circuit.
• Are there any wire scraps or foreign matter left around the terminals?
• Are any screws loose?
• Is the wiring correct?
• Is any terminal contacting any other terminal?
• Is the setting of the EL-BIT and the dip switch correct?
EN-13