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ICS TRIPLEX T9432 Programmable module

Controlled link circuit voltage No reduction in drive dynamics in the event of mains under-voltage. • Charging current limit of the link circuit capacitor The starting current need not be taken into consideration when selecting the switching devices for the power supply. The life expectancy of the switching devices increases. • High load-carrying ability of the control voltage. Up to ten drive modules can be connected to one supply module. • Monitoring the earth connection of connected drives Immediate powering down n the event of a fault by opening the Bb1 contact and an optical display on the LED. • Service Friendly Both the electronic supply and the signal exchange can be simply plugged in.

The short-circuiting of the dc-bus voltage is a supplementary safety factor in addition to braking in the presence of a problem. Synchronous motors (MAC; MDD) are always brought to a standstill by braking them with the dc-bus short circuit, regardless of whether the drive electronics are still working or not. Asynchronous motors (2AD; 1MB) do not brake with short-circuited link circuit voltage. Intact drives can be halted by braking them at maximum torque without dc-bus short circuiting. It must be assumed that those drives with either faulty control electronics or disrupted feedback lines will slow down without electrical braking. The link circuit short circuit can only then be obviated if a slowing down without braking does not damage the unit. Motors with mechanical brakes are an alternative.

Control Circuits

 The control of the mains contactor and the link circuit short circuit represent the operating principle recommended by INDRAMAT. This section will outline different control possibilities. The choice of control and its effect depends on the range of functions of the entire facility and is the responsibility of the facility manufacturer. 3.1 Differentiating Features of the Control Circuits A: Immediate or delayed powering down in an emergency. The INDRAMAT-AC drives can still brake even with power switched off. This means that it is possible in an emergency to immediately switch off power. The energy contained in the movement of the drives is transformed into heat in the bleeder resistor of the supply module. Shutting down the drives takes precedence over protecting the bleeder resistor against overload. Frequent consecutive and arbitrary emergency stops (e.g., when commissioning) can overheat the bleeder resistor. A feedback energy of 100 kWs is permissible over a period of five minutes. If, as a result of a specific application, more feedback energy is expected, then powering down must be delayed.