Chapter 1 Safety Information and Precautions Shenzhen Hpmont Technology Co., Ltd
―2― HD5L Series Controller User Manual
1.3 Installation Limitation
No capacitor or varistor on the output side
Since the controller output is PWM wave, it is strictly forbidden to connect capacitor for improving
the power factor or varistor for lightning protection to the output terminals so as to avoid the
controller fault tripping or component damage.
Contactors and circuit breakers connected to the output of the controller
If circuit breaker or contactor needs to be connected between the controller and the motor, be
sure to operate these circuit breakers or contactor when the controller has no output, so as to
avoid any damage to the controller.
Rated voltage
The controller is prohibited to be used beyond the specified range of operation voltage. If needed,
please use the suitable voltage regulation device to change the voltage.
Change three-phase input to single-phase input
For three-phase input controller, the users should not change it to be single-phase input.
If you have to use single-phase power supply, you should disable the input phase-loss protection
function. And the bus-voltage and current ripple will increase, which not only influences the life of
electrolytic capacitor but also deteriorates the performance of the controller. In that case, the
controller must be derating and should be within the controller 60% rated value.
Lightning surge protection
The controller internal design has lightning surge overcurrent protection circuit, and has certain
self-protection capacity against the lightning.
Altitude and derating
In the altitude exceeded 1000 meters area, since the heatsink efficiency will be reduced because
of the tenuous air, the controller should be derating. Figure 1-1 is the derating curve of the
controller rated current and the altitude.
Figure 1-1 Derating curve of controller rated current and altitude
80%
100%
1000 4000
Controller’s rated current
Altitude(m)
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