Chapter 1 Safety Information and Precautions
Shenzhen Hpmont Technology Co., Ltd.
―
2
―
HD31 Series User Manual V1.1
Mechanical resonance point of load
Set the skip frequency (F05.17 - F05.19) to avoid the load device or the motor mechanical resonance
point.
Start and stop HD31
User should use the control terminal to start and stop HD31.
It is strictly forbidden to use contactor or other switches on the input side of HD31 to start and stop
directly, or it will damage the device.
Check the insulation of the motor
For the first time using of the motor or after long time storage, it needs checking the insulation of the
motor. Worse insulation can cause damage to HD31.
Note:
Use a 500V Mega-Ohm-Meter to test and the insulation resistance must be higher than 5Mohm.
Load and negative torque
For the occasion to boost load and the like, negative torque often occurs. Consider setting proper
parameters of the braking unit if HD31 is prone to overcurrent or overvoltage fault trip.
Requirement for leakage current protector RCD
Since the device generates high leakage current which goes through the protective grounding
conductor, please install B type leakage current protector RCD on one side of the power supply.
For the selection of RCD, users need to consider the possible problems of ground leakage current in
both transient status and steady status at start and during running. It is recommended to choose
either special RCD that can suppress the higher harmonics, or general RCD that has more aftercurrent.
Warning for ground mass leakage current
The device generates mass leakage current, so users need to confirm the reliable grounding before
connect to the power supply. The grounding should comply with the local relative IEC standard.
1.3
About HD31
No capacitor or varistor on the output side
Since HD31 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 HD31 fault trip or
component damage.
Contactors and circuit breakers connected to the output of HD31
If circuit breaker or contactor needs to be connected between HD31 and the motor, be sure to operate
these circuit breakers or contactor when HD31 has no output, so as to avoid any damage to HD31.
Running voltage
HD31 is prohibited to be used beyond the specified range of running voltage. If needed, please use
suitable voltage regulation device to change the voltage.