Senlan Hope800 Series Manual page 10

1 Precautions
As the inverter output is of PWM voltage type, the capacitor or voltage-dependent resistor (for improving
the power factor) installed on the output side of the inverter will lead to inverter trip or damage to
components. Do remove the capacitor or the voltage-dependent resistor before using the inverter.
Installation of switching devices (e.g. contactor) on inverter output side
If a switching device like contactor is required to be installed between the inverter and the motor, make
sure the on/off operation is performed while the inverter has no output, otherwise the inverter may be
destroyed.
Frequent start and stop
For applications where frequent start and stop are needed, terminals are recommended for the control of
the start/stop of the inverter. Using the switching device (such as contactor) on the inverter input side to start or
stop the inverter frequently is prohibited. That may destroy the inverter.
Using the inverter beyond the rated value
It is not recommended to operate the inverter beyond the range of the allowable input voltage. If the
inverter has to be used beyond the range, raise or reduce the voltage via a voltage regulator.
Lightning protection
With the built-in protection of overvoltage from lightning, the inverter has certain self-protection ability
against lightning strike.
Leakage protector
The high-speed switching operation during the running of the inverter will generate high-frequency
current which sometimes causes the mis-operation of the leakage protection circuit. To address this issue,
moderately lower the carrier frequency, shorten the wires or install a leakage protector.
Observe the following points while installing the leakage protector.
1) The leakage protector should be installed on the inverter input side, preferably behind the air switch
(non-fuse circuit breaker).
2) The leakage protector should be one that is insensitive to higher harmonics or specially designed for
the inverter (sensitivity above 30mA). If a common leakage protector is selected, its sensitivity and action time
should be greater than 200mA and 0.2s respectively.
Derating of inverter
1) If the ambient temperature exceeds 40℃, the inverter should be derated as per figure 1 and external
forced cooling should be provided.
2) If the altitude is above 1000 meters, heat dissipation effect of the inverter will be poor due to thin air
thus it should be derated, with derated output and input current value shown in figure B and C;
3) If the carrier frequency is greater than the factory setting, the inverter should be derated by 5% for
every 1kHz increase.
Constant torque
Variable torque
Fig. A
6
%
100
85
80
0 1000 2000 3000 4000
Fig. B
%
100
80
77
0 1000
M
Fig. C
M
2000 3000 4000