Control Techniques EMERSON SPM Installation Manual page 22

4.7.2 Configuration 2
This configuration allows the SPM power modules to be switched out of circuit when the
output power demand is reduced, and conversely for the modules to be re-connected
when the output power demand increases.
If the Master Mode Select switch 1 is connected to SPM Power Selector Module 1, and
Master Mode select switch 2 is connected to SPM Power Selector Module 2, then the
selected mode of operation is as indicated in Table 4-5.
Figure 4-10 Configuration 2
Module 1
* No additional parallel cables are required for this configuration.
Table 4-5 Selecting the mode of operation
Master Mode
Select Switch 1
Open
Open
Closed
Closed
The maximum number of modules that can be paralleled, is limited by the number and
length of parallel cables being used. Refer to section 4.7 SPM Power Selector Module
configurations on page 18 to determine the maximum number of SPM Power Modules
which can be paralleled in this, or any other configuration.
Required Number of SPM Power Selector Modules = N - 1.
Where N - Number of power modules.
If more than two motors are to be used with this configuration, an SM-Applications
module will be required to store the motor map parameters.
22
Module 2
Master 1 Master 1
Slave
Master 2 Master 2
SPM Power
Selector Module 1
Master Mode
Select Switch 2
Open
Closed
Open
Closed
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Module 3
Part / component
Unidrive SPM power modules
SM-Control Master module
SM-Control Slave module
SPM paralleling cable
SPM Power Selector
Slave
SPM Power
Selector Module 2
Mode of operation
Modules 1, 2 and 3 in parallel
Modules 1 and 2 in parallel
Module 1 only
Module 1 only
SPM Power Selector Module Installation Guide
Qty
3
1
2
4*
2
Issue: 2