When motor loads are in operation, they may experience various working states such as braking/starting, and transient impacts cause energy to be fed back to the grid. When APC UPS is used in conjunction with such loads, the current impact of the load needs to be considered.
The ratio of starting current to rated current varies for different types of motor loads, such as 5-7 times for squirrel cage motors, 2-2.5 times for wound motors, and 1.5-2 times for DC motors. In addition to considering the starting current, it is also recommended to consider the overload capacity of the APC UPS inverter (such as 200% overload for 10 seconds, or 150% overload for 30 seconds). However, it should be noted that it is not recommended to consider the bypass overload capacity, otherwise switching back to the inverter mode manually due to APC UPS overload will bring uncertain factors to the safe and reliable operation and regular maintenance of the system.