9905-020 Woodward Load Sharing and Speed Control Series

Description

9905-020 Woodward Load Sharing and Speed Control Series

When the 9905-020  power source is turned on, the following occurs.
1. The CompactLogix 5380 controller draws current from the SA power bus and passes the remaining current through to the next module.
2. The next module completes one of these tasks.
– If the module uses SA power, the module draws current from the 9905-020 power bus and passes the remaining current through to the next module.
– If the module does not use SA power bus current, the module passes the remaining current through to the next module.
3. The process continues until all SA power bus current needs are met for the modules on the SA power bus.
If your system includes AC and DC modules that require SA power, you must use a 5069-FPD field potential distributor to establish a separate SA power bus and separate the module types on the isolated SA power buses.We recommend that you track the SA power bus current draw, max, per module, and
collectively for the CompactLogix 5380 system.You must make sure that the Compact 5000 I/O modules that are installed on an SA power bus do not consume more than 10 A. If so, you must establish another SA power bus.

9905-020 Woodward Load Sharing and Speed Control Series

9905-020 Woodward Load Sharing and Speed Control Series

SA Power—Additional Notes
• Other examples of system configurations that use multiple SA power buses include:
– The modules in the system collectively draw more than 10 A of SA power. That is, the maximum current that one SA power bus can provide.
– The modules in the system must be isolated according to module types, such as digital I/O and analog I/O modules.
– The modules in the system are isolated according to the type of field-side device to which they are connected.
For example, you can separate modules that are connected to field-side devices that use DC voltage from modules that are connected to field-side devices that require AC voltage.
• The actual current in CompactLogix 5380 system changes based on the operating conditions at a given time.For example, the SA power bus current draw on some modules is different if all channels power field devices or half of the channels power field devices.
• Some Compact 5000 I/O modules use field-side power but do not draw it from a SA power bus. The modules receive field-side power from an external power supply that is connected directly to the I/O module.
For example, the 5069-OB16 and 5069-OB16F modules use Local Actuator (LA) terminals on the module RTB, that is, LA+ and LA– terminals for all module channels.
In this case, you can use the same external power supply that is connected to the SA power 9905-020 on the controller to the LA+ and LA– terminals.

9905-020 Woodward Load Sharing and Speed Control Series

9905-020 Woodward Load Sharing and Speed Control Series

If you use local Compact 5000 I/O relay modules, or an AC voltage for locl Compact 5000 I/O modules, then you must connect through a 5069-FPD field potential distributor module. An AC voltage cannot be terminated on the controller.You can use a 5069-FPD field potential distributor to establish a new SA power bus in a
Compact GuardLogix 5380 system.The field potential distributor blocks the current that passes across the SA power bus to its left. At that point, the field potential distributor establishes a new SA power bus for modules to the right. The new SA power bus is isolated from the SA power bus to its left in the system.You can connect either a 24V DC or 120/240V AC external power supply to a 5069-FPD field potential distributor in a Compact GuardLogix 5380 system.

9905-020 Woodward Load Sharing and Speed Control Series

• Other examples of system configurations that use multiple SA power buses include:
– The modules in the system collectively draw more than 10 A of SA power. That is, the maximum current that one SA power bus can provide.
– The modules in the system must be isolated according to module types, such as digital I/O and analog I/O modules.
– The modules in the system are isolated according to the type of field-side device to which they are connected.
For example, you can separate 9905-020 that are connected to field-side devices that use DC voltage from modules that are connected to field-side devices that require
AC voltage.
• The actual current in a Compact GuardLogix 5380 system changes based on the operating conditions at a given time.
For example, the SA power bus current draw on some modules is different if all channels power field devices or half of the channels power field devices.
• Some Compact 5000 I/O modules use field-side power but do not draw it from a SA power bus. The modules receive field-side power from an external power supply that is connected directly to the I/O module.
For example, the 5069-OB16, 5069-OB16F, and 5069-OBV8S modules use Local Actuator
(LA) terminals on the module RTB, that is, LA+ and LA– terminals for all module channels. In this case, you can use the same external power supply that is connected to the SA power RTB on the controller to the LA+ and LA– terminals.

9905-020 Woodward Load Sharing and Speed Control Series

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