In our example:
the real master speed is 500 rpm
the master needs 1 motor revolution for 10cm, the slave 3 motor revolutions
=> EC.14 = 3000 / EC.15 = 1000
The master speed converted to the slave standardisation therefore is 1500 rpm.
The slave speed at the start is zero. Let the acceleration time be 0,2s (per 1000 rpm).
For the acceleration from 0 to 1500 rpm the slave therefore needs 0,3s. The mean speed in the acceleration
phase is 750 rpm = 12.5 U/s. Each revolution corresponds to 10,000 increments.
This results in an acceleration path of:
12,5 U/s x 10000 increments / U x 0,3s = 37500 increments
The master (converted to slave standardisation) constantly runs with 1500 rpm = 75000 increments in 0,3s. The
difference between master and slave is 37500 increments. PS.05 is 60000 increments.
The slave has to wait until the master has still travelled 22500 increments and then synchronises itself without
overshooting according to the adjusted ramp.
Master and slave are running at the correct offset angle after 37500 increments = 3.75 revolution = 12.5 cm of
the slave. They are synchronous starting at the drill head position 32.5cm.
7.12.3.6 Gear factor
The gear factor between master and slave is entered in the parameters for the encoder channel connected to
the master position. Normally, this is encoder channel 2. Therefore, the gear factor must be entered in Ec.14 (or
Ec.58) "gear factor 2 numerator" (= gear factor of the slave) and Ec.15 (or Ec.59) "gear factor 2 denominator"
(= gear factor of the master).
The gear factor is not set-programmable. If it is to be adjusted set-dependently, this can be implemented by ap-
propriately setting the analog parameters (see chapter 7.15.9). Value „1: motorpoti" must be selected in An.53
as source. The motorpoti value (OP.52) is set-programmable.
Control by means of an analog channel is also possible via the analog parameter setting.
The new gear factor during the active synchronous operation changes (at equal actual speed of the master
drive) the master speed expressed in the scale of the slave. Caused by the different
speed of master and slave now there is an angle difference and the slave must be synchronized again.
PS.00: Posi / synchronous mode
Bit Meaning Value Explanation
11
Synchronous
running / gear
factor ramp
(oP.28)
0: on
The slave carries out the new synchronisation using the acceleration /de-
celeration times for clockwise rotation. The sequence corresponds to the
initial synchronisation with ramps (see instructions in item 7.12.3.5.4),
only that the parameter PS.05 "starting offset" has no effect. The treat-
ment of the switching condition "drive running synchronously" corre-
sponds to the behaviour during initial synchronisation with ramps.
2048: off
The slave carries out the synchronisation without ramps at the speed /
torque limit. This setting can be useful if the gear factor is changed con-
tinuously via the analog channel. The switching condition "drive running
synchronously" remains set.
If the gear factor change is smaller than 0.5%, the change is applied without ramp.
Page 7.12 - 24 COMBIVERT F5-A, -E, -H © KEB, 2012-10
Posi- and synchronous operating
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