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Home >> ABB >> ABB Automatic Transfer Switch OTM_C_21D

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ABB Automatic Transfer Switch OTM_C_21D

From:ABB | Author:Wang | Time :2025-01-07 | 280 visit: | Share:

1.1 Use of symbols

Risk of Electric shock: warns about a situation where a hazardous voltage may cause phys ical injury to a person or damage to equipment.

General warning: warns about a situation where something other than electrical equip ment may cause physical injury to a person or damage to equipment.

Caution: provides important information or warns about a situation that may have a detri mental effect on equipment.

Information: provides important information about the equipment.

Table 1. Explanations of abbreviations and terms

—

1.2 Explanations of abreviations and terms

OTM_C21D Automatic transfer switch, the type name

LN1-Switch I Power supply line, e.g. the primary line

LN2-Switch II Power supply line, e.g. the secondary line used in emergency cases

EMRG OFF Used to drive the automatic transfer switch transfers to the “O” position when

receiving EMRG OFF signal.

AUTO Automatic mode

Remote test A sequence to test the functionality of the automatic transfer switch

Ts Transfer delay

TBs Return delay

OV Adjustable overvoltage threshold

UV Adjustable undervoltage threshold

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 un dervoltage detection, transfer delays, generator

start and stop, and remote test function. Source

transfer can be performed using a manually

The standard package includes:

1. automatic transfer switch, 2. handle, 3. handle storage clip 4. terminal plug, 5. mounting kit

Figure 1. OTM_C_21D automatic transfer switch

1. Handle for manual operation

2. Place for auxiliary contact blocks

3. Push button

4. Mimic panel

5. Voltage sensing connections

6. Locking clip for padlock

7. Locking latch for releasing the handle and

locking electrical control

8. Locking clip for locking manual operation

9. Dip switches

10. Rotary switches

11. Connecting terminal

12. Modbus RTU access

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 sum marized 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 sum marized in following steps:

• An anomaly occurs on the Line 1 (LN1)

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

• 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

• Change-over switch stays in position II

• An anomaly occurs on the Line 2 (LN2)

• Return delay TBs

• Change-over switch (Switch II) to the

position 0

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

The transfer sequence of OTM_C21D can be sum marized 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

Figure 4. Automatic Switching Sequences in OTM_C_21D, Manual return mode

And the return sequence can be summarized in

the following steps:

• The Line 1 will start the normal functioning

• Change-over switch stays in position II

• An anomaly occurs on the Line 2 (LN2)

• Change-over switch stays in position II

• Change-over switch can be transferred

manually back to position I

To operate the switch manually:

1.Attach the handle to the switch panel. You can

attach the handle in any position.

2.When the handle is attached, the automatic

transfer switch will automatically be in Manual

mode and won’t operate automatically in case

of line failure. The AUTO LED on the mimic panel

is OFF.

Figure 5. Operating the switch manually

When the handle is inserted into the switch, the switch will enter “manual mode” with the

automatic operation disabled.

Do not adjust wires when the transfer switch is being energized.

Before the power-on operation of the transfer switch, please operate the switch manually

to confirm it is in normal function.

With the power supply function in “normal” and without the handle inserted and EMRG OFF

signals, the initially energized switch will enter automatic mode and transfer to the main

line. Keep the handle inserted if you do not want the switch to be in automatic mode upon

initial energization.

OTM_C21D must be in automatic mode and the

“AUTO” LED is on in order that the switch can

perform automatic transfer cycles according to

the pre-set operating mode.

To operate the switch electrically:

• If the handle inserted

1. Press handle locking clip and remove the handle

from the switch.

2. Press “AUTO” button and the “AUTO” LED will

be ON, indicating automatic mode.

Figure 6. Selecting the automatic transfer OTM_C_21D, switch to Auto Mode

2 1

3

—

3.2 Automatic operation

• If handle is not inserted

1. If “AUTO” LED blinks, press “AUTO” button and

the “AUTO” LED will be ON, indicating auto matic mode.

2. Automatic operation includes three operating

modes: Line 1 priority (factory default setting),

No line priority, and manual return mode.

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