Energy saving
If a fault is triggered, a deactivated keypad and a deactivated CM-Module (if existent)
are switched on again.
Deactivated digital inputs are not switched on again. When the digital signals are in
Standby, one of the following procedures can reset a fault
:
• Reset the fault via Keypad with the STOP key
• Reset the fault via PLC (via Field bus communication)
•
Set STOA and STOB to switch the device again operational and reset the fault
in sequence via digital input set up in Error acknowledgement 103.
8.4 Further energy saving options
DC-link connection
By DC-link connection of several frequency inverters, energy can be saved, as the energy recovered
when one motor is decelerated can be used for accelerating the other drive. In this case, the accelera-
tion energy does not have to be taken from mains supply.
If the deceleration energy from a motor is not used for accelerating the other motor it will be used for
covering the consumption of the coupled frequency inverters.
Energy-optimized braking
The voltage controller can be set up such that the kinetic energy recovered during deceleration opera-
tions is not converted to heat in a brake resistor. The brake ramp will be adjusted automatically such
that the DC-link voltage does not exceed a certain value. The motor is decelerated in an energy-
saving way. The consumption of the frequency inverter is covered by the deceleration energy of the
drive, so that no energy is taken from mains supply.
The voltage controller is described in chapter 7.9.2 "Voltage controller".
PID controller (technology controller): saving energy when the reference value is reached
The PID controller (technology controller) can switch off the motor when the reference value (PID
desired set value) is reached. Saving energy is possible particularly in the case of asynchronous mo-
tors, as these motors consume the magnetizing current even when they are at a standstill. The func-
tion can be used for filling level controls, for example. The function can be set up via parameter
Back-
lash
618.
See chapter 7.9.3 "PID controller (technology controller)".
External DC 24 V power supply
Via an external 24V power supply, the control component of the frequency inverter can be powered
independent of mains supply. The frequency inverter can be disconnected from mains supply via con-
tactor, for example. Even with mains supply switched off, parameterization is still possible, the func-
tion of inputs and outputs and the communication are maintained.
The power consumption of the inverter during extended interruptions of operation can almost be re-
duced to zero.
See chapter 5.7.6 “External DC 24 V power supply”.
Temperature-controlled fans
The fans are controlled in two stages. This is done for the inside fan and the heat sink fan together. If
the inside, capacitor or heat sink temperature set via
Switch-On Temperature 39 is exceeded, the
heat sink fan and the inside fan are switched on at half power. The fans will be switched off again as
soon as the temperatures have dropped below the
Switch-On Temperature 39 by 5 °C again.
If the internally defined maximum inside, DC-link capacitor or heat sink temperature thresholds are
reached (5 °C below maximum temperature), the fans are switched to full power. If the temperature
drops to 5 °C below the switch-on threshold again, the fans return to the half-power stage.
See chapter 7.10.2 "Fan".
The control of the fans can additionally be set via parameter
Standby Mode 1511.
See chapter 8.3 "Standby mode".
263
Further energy saving options 06/2013 Operating Instructions
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