ABB 1SCC303015M0201 Automatic Transfer Switch

ABB 1SCC303015M0201 Automatic Transfer Switch

DESCRIPTION

The OTM_C21D automatic transfer switch can be  used as a source transfer switch in a three-phase  or single-phase networks. Monitored conditions  are, no-voltage, phase-loss, overvoltage and undervoltage detection, transfer delays, generator  start and stop, and remote test function. Source  transfer can be performed using a manually operated handle, locally using push buttons or  fully automatically. The automatic mode includes  several operating methods: Line 1 priority, no line  priority and manual back switching mode. OTM_ C21D can achieve communication function by  using the optional external Modbus RTU module.

The transfer sequence of OTM_C21D can be summarized in following steps:

•An anomaly occurs on the Line 1 (LN1) 

• Generator start, immediately start generator in case of black-out, phase-loss, overvoltage or undervoltage (If Generator mode is selected) 

• The Line 2 start the normal functioning,  transfer delay Ts 

• Change-over switch (Switch I) to the position 0 

• Change-over switch (Switch II) to the position II

And the return sequence can be summarized in  the following steps:

• The Line 1 will start the normal functioning 

• Return delay TBs 

• Change-over switch (Switch II) to the position 0 

• Change-over switch (Switch I) to the position I 

• Generator stop delay Gs 

• Generator stop

The transfer sequence of OTM_C21D can be summarized in following steps:

• An anomaly occurs on the Line 1 (LN1) 

• Transfer delay Ts, in case of black-out, phaseloss, overvoltage and undervoltage conditions 

• Change-over switch (Switch I) to the position 0 

• Change-over switch (Switch II) to the position II

The transfer sequence of OTM_C21D can be summarized in following steps: 

• An anomaly occurs on the Line 1 (LN1) 

• Generator start, immediately start generator in case of black-out, phase-loss, overvoltage or undervoltage (If Generator mode is selected) 

• The Line 2 start the normal functioning,  transfer delay Ts 

• Change-over switch (Switch I) to the position 0 

• Change-over switch (Switch II) to the  position II