Elmo SERVO AMPLIFIER DBP SERIES - Manual (Page 21)

20
DBP - Rev 6/93
Ip - Iop
Tp = 2.2ln ----------
Ip - Ic
Iop - Actual operating current before the peak demand.
The result of this filter is that the maximum peak can last for a maximum of
2 seconds. A lower peak can last longer.
Example: A motor is driven by an DBPF-10/135 amplifier at constant speed and
constant current of 5A. What is the maximum possible duration of a 20A peak ?
20 - 5
Tp = 2.2ln -------- = 0.892 seconds
20 - 10
4.4 Digital position and speed control
The DCB accepts motion commands via an RS232 or RS485 communication line and
receives position feedback in an incremental encoder format either from an
encoder or from the resolver/digital circuit. The DCB derives the closed-loop
position error by comparing the command position and the feedback position. The
error is processed by a digital filter to yield with an analog motor command.
The analog +5 volt range motor command is then amplified by the power
amplifier.
Following is a summary of all the operating modes of the DCB and a detailed
discussion of each of them.
Control Modes
Holding Modes.
Start Modes
Program Mode
Termination Modes
Status reporting
Define origin modes