Siemens SINUMERIK 840C - Manual (Page 573)

7 Drive Machine Data (SIMODRIVE Drive MD) 07.97
7.3.2 Drive MD (data description)
Speed actual value 1707
Default value Lower output limit Upper output limit Units
0.0 -100000.0 100000.0 rev/min
Active
at once
This machine data is used to display the actual speed value and represents the unfiltered
actual speed value. Time-synchronous unlatching (scanning) of machine data MD 1706,
MD 1707 and MD 1708 is not provided. The appropriate machine data is unlatched by the
MMC request "Read variables" via the STF ES communications interface.
Smoothed current actual value 1708
Default value Lower output limit Upper output limit Units
0.0 -100000.0 100000.0 %
Active
at once
This machine data is used to display the smoothed current actual value. The torque-producing
current actual value is smoothed by a PT1 element with the coefficient (MD 1250). In this
case, the smoothed current actual value is displayed as a percentage. 100 % corresponds to
the maximum current of the power section (e.g. with an 18/36A power section 100 % =
36A RMS).
Significance voltage representation 1709
Default value Lower output limit Upper output limit Units
0.0 -100000.0 100000.0 –
Active
at once
This machine data is used to display the significance of the voltage representation. The user is
informed of the percentage significance of bit 0 so that he can assign the internal voltage
status representation to the control setting of the pulse inverter. The maximum actuating
voltage is available internally in standardized representation as a function of the pulse
frequency.
V
DC link
V
LSB
= MD 1709 = ––––––
2
Note:
This machine data is calculated only once during power-up; it cannot therefore be changed
during operation.
Significance current representation 1710
Default value Lower output limit Upper output limit Units
0.0 -100000.0 100000.0 µ A
Active
at once
This machine data is used to display the significance of the current representation. The user is
informed of the significance of bit 0 (internal current actual value representation) so that he
can assign the internal current status representation to the physical ampere values. The
maximum power section current is available internally in standardized representation.
Note:
This machine data is calculated only once during power-up; it cannot therefore be changed
during operation.
7–158 © Siemens AG 1992 All Rights Reserved 6FC5197- AA50
SINUMERIK 840C (IA)