AC TRACTION – MOTOR SET-UP EXAMPLE PG DRIVES TECHNOLOGY
• Drive Voltage Base: 30.0Vrms
• Drive Voltage Maximum: 30.0Vrms
• Drive Slip Minimum: 1.50Hz
• Drive Slip Boost: 2.87Hz
• Drive Slip Base: 2.62Hz
• Drive Slip Maximum: 2.50Hz
Always try to avoid reaching the 1.17 Maximum Current Limit as the vehicle driver could sense
this. The limit is for protection against over-current and should not be used as a means of
control.
1.12 Fine-Tuning Braking
Fine-tuning for braking is different between Torque control (3.2 set to 0) and Speed control (3.2 set to 1).
In Torque control, the curve is not linear, which can be noticed when braking. For example, if the torque is higher at Boost Speed
than at Minimum and Base Speed the braking is not constant if you brake from Base Speed to zero. It is possible to increase the
Minimum Voltage and Minimum Slip values as well as the Base Slip value to have a higher braking torque. If the braking torque
feels constant from Maximum speed to zero speed, the set-up is O.K. After this, the braking torque can be limited by changing
the brake settings 1.9, 1.10 and 1.11 in the Adjustments menu.
In Speed Control, braking is different. Braking is time related and not torque related. It is not easy to fine-tune the braking settings
in Speed control. To get a good feel, you have to set braking up in Torque Control mode first and then revert to Speed Control
mode.
When changing from Torque to Speed Mode, take care, as the delay settings 1.2, 1.12, 1.13, & 1.14
need to be set shorter with Torque Control, e.g., 0.3s and longer for Speed Control, e.g. 2.0s.
SK79646-01 72
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