ABBDCS Thyristor Power Converters for DC Drive Systems 25 to 5150 A Operating Instructions DCS 600 MultiDrive

R9 [on PS5311 board].

Stop the drive and switch OFF power!

2.6.3 Field weakening control with setting range > 1 : 1.5

CAUTION: Not permitted when Chapter 2.5 was quit with EMF control!

 15.06 = EMF CON

Field weakening function activated.

46.01 = 0

46.02 = 0

EMF controller switched off by limitation.

46.07 = EXT REF

Links up the Parameter 45.01 as the flux

reference value; this will only be possible, if there

is still no connection to an APC.

45.01 = 100 % (in the PC program DRIVES WINDOW = 99.98 %)

Flux reference value set to 100 %

The next steps serve to determine the motor’s field characteristic. For this purpose,

the reference setting in ”LOCAL” mode is used to adjust a speed n which is within

the motor's basic speed range and can be easily converted into 90 %, 70 % and 40 %.

Example: if n is selected so as to produce a motor voltage of 300 V, then 90 % will

correspond to 270 V, 70 % to 210 V and 40 % to 120 V.

For determination of the motor's field characteristic the actual values EMF_V

(Parameter 1.17) and FIELD1 CUR_ACT (Parameter 3.19) will be required.

Both values have to be set by means of the Control Panel in ”ACT” (Actual Signal

Display) mode and must be transmitted from the SDCS-CON-2 board to the SDCSAMC-DC board. The Parameter 94.11 already includes Parameter 3.19 as default

setting, i.e. only the value of Parameter 1.17 has to be set to e.g. 94.01 = 117:

94.01 = 117 (only required, if the values are to be displayed on DRIVES WINDOW!).

Switch ON power.

DANGER: System components now energized!

Start drive.

Increase speed reference value in LOCAL mode until the Parameter 1.17 will show

a value of 100 % for RL EMF VOLT ACT (⇒ 300 V in the example) as desired in the

aforementioned steps.

45.01 = decrease so that RL EMF VOLT ACT (1.17) is 90 %.

Flux and thus the field current as well are reduced.

How to proceed using the Control Panel:

1. decrease 45.01 (in steps of 5 at a time)

2. press ACT, read off Parameter 1.17

3. press PAR and correct 45.01 if necessary (then continue with 2.)

Read out and note down value of:

3.19 = ......... % (value for 41.16; will later be entered

45.01 = decrease so that RL EMF VOLT ACT (1.17) is 70%.

Flux and thus the field current as well are reduced.

Proceed as described in (1. / 2. / 3.) above!

Read out and note down value of:

3.19 = ......... % (value for 41.15; will later be entered)

45.01 = decrease so that RL EMF VOLT ACT (1.17) is 40%.

Flux and thus the field current as well are reduced.

Proceed as described in (1. / 2. / 3.) above!

Read out and note down value of:

3.19 = ......... % (value for 41.14; will later be entered)

Stop the drive and switch OFF power!

45.01 = 100 %

46.01 = 10

46.02 = - 99

46.07 = SEL REF

As-delivered values (default values) for all 4 parameters restored.

41.19 = ? reference armature voltage scaled to Supply voltage

41.16 = enter the 1st noted down value of 3.19

41.15 = enter the 2nd noted down value of 3.19

41.14 = enter the 3rd noted down value of 3.19

Linearization function matched to field circuit.

99.02 = 90 % of the rated motor voltage.

99.05 = 90 % of the value on the motor rating plate.

These settings provide a bigger safety margin for the motor voltage during start-up.

Only if analog tacho is used as speed feedback!

Switch ON power; start drive.

DANGER: System components now energized!

Increase the reference value in LOCAL mode slowly up to maximum speed.

Check motor voltage; if value has been set with 99.02, motor voltage must

remain constant, or must not exceed this value.

Measure speed with manual tacho; balance maximum speed with Potentiometer

R2716 [on SDCS-CON-2 board] or R9 [on PS5311 board].

Stop the drive and switch OFF power!

2.7 Balancing the speed controller, plus fine-balancing the EMF

The balancing procedure indicated below assumes that the coupled load will withstand speed jumps. If this is not allowed for the load, a different setting of the listed

parameters will be required.

Reference values switching over between the internal potentiometers POT1 and POT2

(Parameters 17.01 and 17.02) will be used for balancing the controllers. Parameter

PERIOD 17.03 defines the period of switch-over; value 1 corresponds to 10 msec.

15.02 = 9

Switch-over of reference value for the speed controller, also suitable for the EMF

controller.

17.04 = SQWAVE

Selection of the reference value switching over between POT1 and POT2.

22.01 = 0,1 s

Ramp-up time of ramp-function generator

22.02 = 0,1 s

Ramp-down time of ramp-function generator

Adjusting the potentiometers for speed controller balancing:

During acceleration/ braking, the drive should reach the current limitation, if necessary

increase the value of POT1.

Scaling of 17.01 and 17.02 ⇒ 20 000 corresponds to 100 % speed.

17.01 (POT1) = 10%...20% max. speed

17.02 (POT2) = 0

17.03 (PERIOD) = Adapt as necessary.

Switch ON power; start drive.

DANGER: System components now energized!

Drive should run at speed values corresponding to POT1 and “0”.

For assessing control quality, the figure below can be used.

Oscillograph speed feedback via D/A output, or if one is to hand, use program DRIVES

WINDOW to depict it via the Monitor menu and Parameter 1.04.

t

A

B

C D E F

Fig.: Transient response of controller