4 Operation4.5 Commissioning instructions104 DS7 Soft starter 09/16 MN03901001Z-EN www.eaton.com4.5 Commissioning instructions.No. Occupation1 Set the potentiometer or the U-Start parameter as per the recommendation in the table above or,as a general setting, turn t-Start to approximately 50% (15 s) and t-Stop to its minimum value(0 = coasting).2 StartingAfter a maximum time of one second, the motor should start to turn, otherwise deactivate thestart signal (or on devices from 41 A the Enable signal) immediately.If the motor has turned, proceed with point 3.If the motor has not started, increase U-Start by around 10 % (to around 40 %).Wait a minute for cooling and repeat step 1.3 Optimizing t-Start: The motor should accelerate evenly from standstill to rated speed atrated load. When it has reached rated speed, the set ramp time should have completed(U2 = ULN , = TOR).4 Repeat the start process. After every start, wait around five minutes in order to allow the unitto cool down.5 Run-up optimization• If the drive accelerates faster than the set ramp time (t-Start), shorten this as much asthis application allows.• If the application requires more time for the acceleration than the set ramp time, increasethe value of t-Start – unless the load cycle of the soft starter is exceeded.• If the acceleration time is longer than the limits set in step 4 or 5, let the soft starter cooldown for 5 minutes, increase the ramp time and proceed with step 4.6 If a stop ramp is needed, the time set (t-Stop) should be longer than the machine’s coasting timein order for the stop ramp to have an effect. As a soft stop produces a current increase, observethe thermal output capacity (load cycle) of the soft starter (number of starts per hour). Within thiscontext, the stop ramp must be considered equivalent to a start in terms of thermalcharacteristics.￫ If the required settings for an application exceed the permissibleload cycle of the soft starter, a larger device must be selectedaccordingly.￫ The soft starter heats up at the start. In order to avoidoverheating, make sure to adhere to the required cool-downtimes without fail. If there will be frequent starts during normaloperation, the soft starter may have to be oversized undercertain circumstances and/or optional fan DS7-FAN… may haveto be used.For more information, refer to the “Technical data” appendix.Additional information including application and sizing examplesis found in manual MN03902001Z-EN, “Sizing Soft Starters.”
