Nidec SI-Encoder V2 User Manual page 26

Safety information Introduction
Freeze Flag
mm.104
Minimum 0
Decimal places 0
Type 1 bit Volatile
The freeze flag is set when a freeze event occurs. If 0 is written to Freeze Flag (mm.104) the freeze flag is cleared.
Freeze Input State
mm.113
Minimum 0
Decimal places 0
Type 1 Bit Volatile
This parameter shows the state of the freeze signal from the drive.
Freeze Sensor Delay
mm.114
Minimum 0.0
Decimal places 1
Type 16 Bit User Save
Any delay in the sensor used to trigger a freeze event will cause the freeze position to advance (giving a larger freeze position) in the forward direction
or retard (giving a smaller freeze position) in the reverse direction compared to the actual physical position. This effect becomes worse as the speed
is increased. The error is given by:
Freeze Error = (Speed (rpm) / 60) x 2
Normalised Position Bits is the number of bits representing one turn given by:
Normalised Position Bits = 32 – Normalisation Turns (mm.057)
The time delay due to the drive and option module electronics is less than 500 ns for either the digital I/O or the marker inputs. However, external
sensors can significantly increase the delay. Freeze Sensor Delay (mm.114) can be used to cancel the effect of the sensor delay and prevent
unwanted advancing or retarding to the freeze position at higher speeds.
Key to parameter coding
RW Read write
ND No default value
BU Unipolar or bit parameter with default of 1
VM Variable maximum
26
Mechanical Installation Electrical Installation
Maximum
Units
Display format
Maximum
Units
Display format
Maximum
Units
Display format
Normalised Position Bits
x Sensor Time Delay
RO Read-only
NC Not cloneable
RA Voltage rating dependent
DE Destination parameter
Getting Started
1 Default
Update rate
Standard Coding
1 Default
Update rate
Standard Coding
250.0 Default
µs Update rate
Standard Coding
Parameters Diagnostics
250 µs write
RW, ND, NC, PT
4 ms write
RO, ND, NC, PT
0.0
Background read
RW
TE Text string
PT Protected
FI Filtered
PR Pseudo read-only
SI-Encoder V2 User Guide