Configuration
6.9 Switching of capacitive loads
SIRIUS - SIRIUS 3RT Contactors/Contactor assemblies
Manual, 09/2017, A5E03656507120A/RS-AE/006
111
Hazardous voltage. Will cause death or serious injury.
Turn off and lock out all power supplying this device before working on this device.
Danger of personal injury:
• Do not operate manually
• Do not carry out repairs on faulty contactors
Danger of material damage
To prevent the contactors from being destroyed, please follow these instructions:
• Do not exceed the permissible number of switching operations
• Do not close the contactors when the capacitors are loaded
• Do not operate the contactors unless the precharging resistors are connected
• Do not use any undefined or faulty control voltage (e.g. if control voltage is drawn from
the main circuit without a control transformer)
• After short-time interruptions of the control voltage, do not energize capacitors that have
not yet discharged
• Do not operate manually for function test
• Switch to discharged capacitors only!
• Do not operate manually for a function test.
• The precharging resistors must not be removed as otherwise the contacts will be
damaged during switching operations with load.
• The enclosure of the precharging resistors heats up during the making operation.
Once the main contacts have closed, the temperature rise of the precharging resistors is
stopped because the auxiliary contacts decouple. However, as it cannot be ruled out in the
event of a fault that critical overheating may occur, it is recommended to select appropriate
materials in the environment of the capacitor contactors, e.g. flame-retardant and self-
extinguishing materials.
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