AC90 TENSION CONTROL FREQUENCY INVERTER MANUAL BASIC OPERATION AND TRIAL RUN
10
●
In order to improve the product stability, pls do not use the inverter where temperature changes sharply. While using
in closed space such as control cabinet, please use cooling fan or air-condition to cool inverter to avoid temperature
over limit range. Please also prevent inverter from freeze, too low temperature may cause components freeze fault.
●
Derate according to the chart while over temperature limit.
30
25
100
75
50
40
20
10
0
-10
50
TEMPERATURE(
℃
)
PERMIT OUTPUT CURRENT(%)
Chart 3-2:AC90 series inverter derating surve while over permit temperature temperature
●
Derate according to the chart while over altitude limit.
0
1000
2000
4000
80
100
3000
ALTITUDE(M
）
PERMIT OUTPUT CURRENT(%)
Chart 3-3:AC90 series inverter derating surve while over permit altitude
3.4 EMI Protection
The inverter is designed to be used in industrial environment with strong electromagnetic interference. Generally
speaking, if the installation quality is good, it is ensured that the inverter can work safely without fault. Please install the
inverter according to the following rules to ensure stable running and avoid electromagnetic interference impact.
●
Ensure that all equipments in the cabinet have been connected reliably to the common Y-type earth point or earth
bus with thick and short cable. The motor earth should be as close as possible. Please do not connect the motor
case to the inverter earth terminal or the protective area of control system.
●
Ensure that all equipments connected to the inverter have been reliably connected to the same earth net or Y-type
earth point with thick and short cable.
●
The conductor has better to be flat and with multi core, what has lower resistance at high frequency.
●
The cutting terminal should be as soigne as possible. Unshielded wire section must be as short as possible.
●
In control cable wiring, it should be as far from the power supply cable and motor cable as possible. And independent
cable trough should be used. While the control cable must cross to the power supply cable or motor cable, it should
be 90º vertical cross.
●
Ensure that the contactor in the cabinet has wave surge suppresser. Or‘R-C’damping circuit is connected to the
winding of AC contactor. Voltage dependent resistor corresponding to the winding voltage is used. And freewheel
diode or components such as voltage dependent resistor corresponding to the winding voltage are connected to DC
contactor. It is very important while contactor, controlled by output relay of inverter, acts frequently.
●
Cable connected to motor should be shielded cable or armoured cable. The two barriers are earthed reliably by
cable grounding card.
●
Build noise filters at the input side to reduce electromagnetic interference from other equipments at the power grid
side. The noise filter should be as close to the inverter power input terminal as possible. Meantime, the filter must
earth reliably as the inverter.
