Spare Circuit - Powtran PI160 Series Manual

Chapter 4 Installation and commissioning
Make sure that the input power is consistent with the rated value of inverter, otherwise
which may cause damage to the inverter!
Make sure that the motor matches the inverter, otherwise which may cause damage to the
motor or activate the inverter protection!
Do not connect power supply to U, V, W terminals, otherwise which may cause damage to
the inverter!
※ The U, V, W output end of inverter can not install phase advancing capacitor or RC absorbing
device. The inverter input power must be cut off when replacing the motor
※ Do not let metal chips or wire ends into inside the inverter when wiring,otherwise which may
cause malfunction to the inverter.
※ Disconnect motor or switch power-frequency power supply only when the inverter stops
output
※ In order to minimize the effects of electromagnetic interference,it is recommended that a surge
absorption device shall be installed additionally when electromagnetic contactor and relay is
closer from the inverter.
※ External control lines of inverter shall adopt isolation device or shielded wire.
※ In addition to shielding, the wiring of input command signal should also be aligned separately,
it is best to stay away from the main circuit wiring.
※ If the carrier frequency is less than 3KHz, the maximum distance between the inverter and the
motor should be within 50 meters; if the carrier frequency is greater than 4KHz, the distance
should be reduced appropriately, it is best to lay the wiring inside metal tube.
※ When the inverter is additionally equipped with peripherals (Filter, reactor, etc.), firstly
measure its insulation resistance to ground by using 1000 volt megger, so as to ensure the
measured value is no less than 4 megohms.
※ When the inverter need to be started frequently, do not directly turn power off, only the
control terminal or keyboard or RS485 operation command can be used to control the
start/stop operation, in order to avoid damage to the rectifier bridge.
※ Do not connect the AC input power to the inverter output terminals (U, V, W) .
※ To prevent the occurrence of an accident,the ground terminal (
(grounding impedance should be less than 10 ohms), otherwise the leakage current will occur.
※ The specifications on wires used by the main circuit wiring shall comply with the relevant
provisions of the National Electrical Code.
※ The motor's capacity should be equal to or less than the inverter's capacity.

4-7.Spare circuit

When the inverter occurs the fault or trip, which will cause a larger loss of downtime or other
unexpected faults. In order to avoid this case from happening, please additionally install spare
circuit to ensure safety.
Note: The characteristics of spare circuit must be confirmed and tested beforehand, and its
power-frequency shall be in accordance with the phase sequence of the inverter.
R
S
T
K1 K2
R
S
T
) must be earthed firmly
MCC1
U
PI160
V
Inverter
W
MCC2
K3
Interlocked AC contactor
of MCC1 and MCC2
20
M
3 ~