Senlan SB200 Series, User Manual, Page: 10 / 181

Notes on Safety
6
„ Contactor, etc. Installed at the Output Terminal of the Inverter
If installation of contactors, etc. is required between the output terminal and the motor, please
ensure that make-break operations are conducted when the inverter has no power output;
otherwise the inverter may be damaged.
„ Frequent Startup/Shutdown Operations
Control terminals are recommended for the startup/shutdown of the inverter. The user is
absolutely not permitted to directly shut down or start up the inverter via such circuit-breakers
as a contactor on the input terminal of the inverter.
„ Application beyond the Rated Voltage
It is inadvisable to apply the SB200 inverter series to ranges beyond the permitted input
voltage. If the user needs to apply the inverter to ranges beyond the rated voltage, please use a
step-up or step-down transformer for transformation.
„ Switching from 3-Phase Input to Single Phase Input
The change from 3-phase input to single phase input will augment the voltage/current ripples
of the busbar. Ripples affect the service life of capacitors in the main circuit and deteriorate
the performance of the inverter as well.
It is not recommended to switch to single-phase input. If a single-phase power supply is necessitated,
the user must cancel phase-failure protection and reduce the ratings to a max of 60%. If a 30kW
inverter or above requires to be changed to single phase input, ensure that the single-phase input
terminal is connected to Terminals R and S, otherwise the inverter will fail to work.
„ Lightning Surge Protection
The inverter has an inbuilt lightning overvoltage protector capable of self-protection against
induced lightning shocks.
„ Leakage Protector
Quick startups or shutdowns during inverter operation necessarily induce high-frequency
leakage currents, which may sometimes cause misoperations of the leakage protection circuit.
In the event of the aforesaid problems, reduce the carrier frequency and the length of the
lead-in wire appropriately; besides, the leakage protector must be correctly installed.
Keep the following points in mind when installing a leakage protector:
1) It is more proper to install the protector at the input terminal of the inverter and behind the air
circuit-breaker (not a fuse circuit-breaker).
2) The selected leakage protector must be insensitive to higher harmonics (sensitivity: Above
30mA) or specially suited for inverter applications. If a common leakage protector is selected, it
must have sensitivity above 200mA and an action time above 0.1s.
„ Inverter Derating
1) When the ambient temperature exceeds 40
℃
, the inverter must be derated by 5% for every