Publicidad
UF3300 Modbus
13.6.3
Changing the Damping Time, Mode and Dynamic Damping Threshold
In this example we will set the Fixed damping time to 20 seconds,
change the damping mode to Dynamic and change the Dynamic
Damping Acceleration Threshold
1. Ensure inhibit bits are not set and that the update flags (bit 0
and bit 1 of the Status Flags register) are reset.
2. Send a MASK WRITE REGISTER message (command 22 or
0x16) to register address 5 with the AND mask being set to
0xFFFE and the OR mask being 0x0001. This will set the "Lock-
out Updates" flag (bit 0) of the Instrument Control Flags register.
3. There are two ways to set the value in the Damping register.
Since 7 bits (0-6) are used for the Fixed damping time and the
7
th
bit controls the mode (1=dynamic,0=fixed). These values can
be set using MASK WRITE REGISTER message to set each
field, or first send A WRITE SINGLE REGISTER Command with
the damping time, followed by a MASK WRITE REGISTER
message to set bit 7, or alternately just send a single WRITE
SINGLE REGISTER command with the value of the damping
time plus 128. All these approaches are acceptable. This
example will use the second method.
Since the damping time is 20 seconds, send a WRITE SINGLE
REGISTER message (command 06) with the value 20 to
register address 138. Now send a MASK WRITE REGISTER
message (command 22 or 0x16) to register address 138 with
the AND mask being set to 0xFF7F and the OR mask being
0x0080. This will set the Damping Type (mode) to dynamic.
When dynamic damping is specified, the user may set the absolute value of
9
an acceleration threshold that triggers a change to a lower damping time.
When the absolute value of acceleration reduces below this threshold for more
than a few seconds, the damping time returns to that of the fixed value.
Page 30
9
to 0.25 m/s
2
.
Publicidad
