Switching - TAVRIDA ELECTRIC VCB Series User Manual

6.1 Switching

Closing
To close the ISM main contacts the CM close command shall be applied. It is a "dry contact" input so no
external voltage should be applied.

The Close command will be accepted if:

CM state is "Ready" (Ready LED flashes green);

no Trip command is applied;

optional electrical interlock is unlocked;

mechanical and electrical interlock is unlocked (in case of ISM15_LD_8, ISM15_MD_1, ISM15_MD_3,
ISM15_Shell_2 and ISM15_HD_1 only).
If Close command is applied and held before the CM is in a "Ready" state the Close command will not be
accepted. If auxiliary power is not available, the manual generator CBunit_ManGen shall be used to charge
the CM capacitors and to close the ISM. Mechanical closing is not possible.
Figure 156
CM_16 close and trip inputs
If Manual generators CBunit_ManGen are used to charge the CM, the Manual generator handle shall be
rotated until the Ready LED of the CM flashes green (approximately 30 seconds). Then the ISM close
command can be applied to the CM. One possible variant is the connection of NO and Common contacts of
relay Ready to the Close command input of the CM. Be aware that in this case the ISM will be closed
automatically once the CM reaches the Ready state.
Figure 157
CM_16 power supply connection
If Manual generators CBunit_ManGen are used for charging the CM, DC voltage outputs of the Manual
generator shall be connected to the power supply inputs (Figure 157) of CM_16_1. Pay special attention to
the correct polarity for CM_16_1(Par1_60.1_Par2_Par3_Par4_Par5).
97
1. Close command input
2. Trip command input