AMETEK ASD Series - Manual (Page 68)

Programming: Digital Interface Control Sorensen ASD Series
4-10 M551177-01 Rev A
Process Limit
(only in analog
programming
mode) If desired, the maximum output (current or voltage) generated
by the process control loop can be limited by an analog input
(Iprog input). This is configured by a bit in the “Process_config”
register. See Table 4-7 for more details. If the unit is in digital
programming mode, the maximum voltage and current outputs
are controlled by the Vsetpoint and Isetpoint registers.
Figure 4-1. Block Diagram, External Process Control Feature
4.3.9 PROGRAMMABLE FULL-SCALE SETTING
There are two registers called “Ilimit” and “Vlimit” to artificially define the
“full-scale” range and scale of the power supply setpoints. These registers
can be programmed with values lower or higher than the actual power
supply full-scale current and voltage. The registers have two effects:
 Analog ports scale (programming inputs and monitor outputs): 0 to
10V (or 4 to 20mA) represents to 0 to Ilimit (or 0 to Vlimit) instead
of 0 to full-scale values.
 Saturation limit of digital programming: the master controller will
saturate the programmed setpoints to the values in Ilimit and
Vlimit.
If this feature is not used (default), a value of 0 has to be programmed.
For example, a 60V power supply can have Vlimit = 50V and 0-10V means
0-50V output. If Vlimit is higher than 60V, the power supply will generate a
COMMAND_ERROR fault (see Table 14) if it is actually programmed with
a value higher than 60V.
4.3.10 QUERYING MODULE INFORMATION
Certain module information can be accessed through the master controller
digital interface by using the module query register.
The wri te register “Query_Module” has to be written with the module
address number in the most significant 8 bits, and with a command
number in the least significant 8 bits. Table 6 shows the possible data that