Siemens CU240S DP-F Parameter Manual

Parameters
List of Parameters
1-58
© Siemens AG 2007 All Rights Reserved
SINAMICS G120 Control Units CU240S, Edition 05/2007
Description: Shows the internal counter value of the encoder pulses.
Description: Selects reaction on loss of speed signal.
Values: 0: Trip the drive
1: Warn and switch to SLVC if in VC
Description: Parameter P0492 is used for low and high speed encoder loss detection (fault: F0090).
High speed encoder loss detection:
This condition occurs when the allowed frequency and the allowed difference of the speed signals between sam-
ples, set in P0492 is exceeded.
• f_act and f(t_2) - f(t_1) > P0492
Low speed encoder loss detection:
This condition occurs when the actual frequency is < P0492 when encoder loss occurs.
• Condition 1:
- r0061 = 0 and torque limit and then
- r0061 = 0 with setpoint frequency > 0 for time > P0494
• Condition 2:
- Act. freq. < P0492 and f(t_2) < P0492 and ASIC detect channel B loss
Dependency: This parameter is updated when motor start-up time P0345 is changed or when a speedloop optimisation is per-
formed (P1960 = 1).
There is a fixed delay of 40 ms before acting upon loss of encoder at high speeds.
Caution: P0492 = 0 (disabled):
When allowed speed difference is set to 0, both the high speed and low speed encoder loss detection are disabled,
thus encoder loss will not be detected.
If encoder loss detection is disabled and encoder loss occurs, then operation of the motor may become unstable.
Consideration also needs to be given to drive operation when the drive is operating in vector speed control or vector
torque control mode (P1300 = 21, 23) and the drive attempts to start the motor while it has a failed encoder.
Under these circumstances, the drive uses parameters P1520 and P1521 (the upper and lower torque limits
respectively) to decide when to trip.
In the case of a very low frequency set point, it may take the drive a considerable period to reach this condition, dur-
ing which time the drive can lose orientation.
r0485 CO: Encoder counter value / Encoder count val.
CU240S
CU240S DP
CU240S DP-F
CU240S PN
Access level: 2 P-Group: Closed-loop control Data type: Unsigned32
Unit: - Data set: -
p0491[0...2] Reaction on speed signal loss / Select enc. type
CU240S
CU240S DP
CU240S DP-F
CU240S PN
Access level: 2 P-Group: Encoder Data type: Unsigned16
Quick comm. NO Active: NO Data set: DDS
Can be changed: T
Min Max Factory setting
0 1 0
p0492[0...2] Allowed speed difference / Allowed speed dif
CU240S
CU240S DP
CU240S DP-F
CU240S PN
Access level: 2 P-Group: Encoder Data type: Floating Point
Quick comm. NO Active: YES Data set: DDS
Can be changed: T
Min Max Factory setting
0.00 [Hz] 100.00 [Hz] 10.00 [Hz]

Siemens CU240S DP-F Specifications

General

Brand	Siemens
Model	CU240S DP-F
Category	Control Unit
Language	English