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When a fan is started manually, the fan should be in a static state, and the manual start button of other fans is not pressed; At the same time, other fans are not in the starting state, and there is no fan starting in the automatic cycle, so the starting is effective. The effective time is 1min, which is determined by T5. For example, in case of manual soft start of # 3 fan, it must meet the requirements that # 3 fan is in manual start state, # 3 fan has no operation and start feedback signal, and # 1, # 2, # 4 fans have no start requirements and are not in the process of soft start. The above conditions are realized by the series connection of normally closed contacts x046, x047, x056, x060, M26, m29, T5 and x063. If the conditions are established, when the contact x062 is closed, it will enter the soft start state. Fig. 4 is the ladder diagram for selecting two fans for use and two for standby. M3 is the automatic starting mode of # 1 and # 2 fans: the # 3 and # 4 fans are in standby or manual starting mode; M4 is the automatic starting mode of # 3 and # 4 fans, and # 1 and # 2 fans are in standby or manual starting mode.
The following principles must be followed to realize the soft starting of multiple motors by a single soft starter
1. Set the start and stop mode of soft starter according to the requirements;
2. Correctly identify and select the motor to be started;
3. Reasonable control of starting process. After more than one year of operation, the above control equipment is in normal condition and has received good economic benefits.
