ABB SDCS-CON-4 Digital inputs

equipment..

WARNING!

• Only qualified electricians are allowed to install and maintain the drive!

• Never work on the drive, motor cable or motor when main power is applied.

Always ensure by measuring with a multimeter (impedance at least 1 Mohm)

that:

1. Voltage between drive input phases U1, V1 and W1 and the frame is

close to 0 V.

2. Voltage between terminals C+ and D- and the frame is close to 0 V.

• Do not work on the control cables when power is applied to the drive or to the

external control circuits. Externally supplied control circuits may cause

dangerous voltages inside the drive even when the main power on the drive is

switched off.

• Do not make any insulation resistance or voltage withstand tests on the drive or

drive modules.

• Isolate the motor cables from the drive when testing the insulation resistance or

voltage withstand of the cables or the motor.

• When reconnecting the motor cable, always check that the C+ and D- cables

are connected with the proper terminal.

Note:

• The motor cable terminals on the drive are at a dangerously high voltage when

the main power is on, regardless of whether the motor is running or not.

• Depending on the external wiring, dangerous voltages (115 V, 220 V or 230 V)

may be present on the relay outputs of the drive system (e.g. SDCS-IOB-2 and

RDIO).

• DCS800 with enclosure extension: Before working on the drive, isolate the

whole drive from the supply

Terminal cover according to VBG 4 regulations

For converter modules size D1 - D4 shrouds for protection against contact are                                     

provided.

Id No.	Id No.
3ADT631137P0001	D1, D2
3ADV400208P0001	D3
3ADV400207P0001	D4

Chapter overview

This chapter contains the instructions that must be followed when selecting the

motor, cables, protections, cable routing and way of operation for the drive system.

Always follow local regulations. This chapter applies to all DCS800 converter                            

modules.

Attention:

If the recommendations given by ABB are not followed, the drive may experience

problems that the warranty does not cover. See also Technical Guide.

Options

Line reactors (L1)

For armature and field supply.

When thyristor converters operate, the line voltage is short-circuited during

commutation from one thyristor to the next. This operation causes voltage dips in the

mains PCC (point of common coupling). For the connection of a power converter

system to the mains, one of the following configurations applies:

Configuration A

When using a converter, a minimum of impedance is required to

ensure proper performance of the snubber circuit. Use a line reactor

to meet this minimum impedance requirement. The value must

therefore not drop below 1 % uk (relative impedance voltage). It

should not exceed 10 % uk, due to considerable voltage drops at the

converters outputs.

Configuration B

If special requirements have to be met at the PCC (standards like EN

61 800-3, DC and AC drives at the same line, etc), different criteria

must be applied for selecting a line reactor. These requirements are

often defined as a voltage dip in percent of the nominal supply

voltage. The combined impedance of ZLine and ZL1 constitute the total

series impedance of the installation. The ratio between the line

impedance and the line reactor impedance determines the voltage dip

at the PCC. In such cases, line chokes with an impedance around 4 %

are often used.

Example calculation with ukLine = 1 % and ukL1 = 4 %:

Voltage dip = ZLine / (ZLine + ZL1) = 20 %. Detailed calculations see

Technical Guide.

Start, Stop and E-Stop control The relay logic is splitted into four parts: 1: Generation of the On / Off and Start / Stop command: The commands represented by K20 and K21 (latching interface relay) can also be generated by a PLC and transferred to the terminals of the converter either by relays, using galvanic isolation or directly via 24 V signals. There is no need to use hardwired signals. Transfer these commands via serial communication. Even a mixed solution can be realized by selecting different possibilities for the one or the other signal (see parameter group 11). 2: Generation of control and monitoring signals: Control the main contactor K1 for the armature circuit by the dry contact of DO8 located on the SDCS-PIN-4 or SDCS-POW-4. The status of motor (K6) and converter (K8) fans can be monitored by means of MotFanAck (10.06) and ConvFanAck (10.20). 3: Off2 (Coast Stop) and Off3 (E-stop): Beside On / Off and Start / Stop the drive is equipped with two additional stop functions Off2 (Coast Stop) and Off3 (E-stop) according to Profibus standard. Off3 (E-stop) is scalable via E StopMode (21.04) to perform stop category 1. Connect this function to the E-stop push button without any time delay. In case of E StopMode (21.04) = RampStop the K15 timer relay must be set longer than E StopRamp (22.04). For E StopMode (21.04) = Coast the drive opens the main contactor immediately. Off2 (Coast Stop) switches the DC current off as fast as possible and prepares the drive to open the main contactor or drop the mains supply. For a normal DC motor load the time to force the DC current to zero is below 20 ms. This function should be connected to all signals and safety functions opening the main contactor. This function is important for 4-Q drives. Do not open main contactor during regenerative current. The correct sequence is: 1. switch off regenerative current 2. then open the main contactor In case the E-stop push button is hit, the information is transferred to the converter via DI5. In case E StopMode (21.04) = RampStop or TorqueLimit the converter will decelerate the motor and then open the main contactor. If the drive has not finished the function within the K15 timer setting, the drive must get the command to switch off the current via K16. After the K16 timer has elapsed, the main contactor is opened immediately, independent of the drive's status.