Kohler — Decision-Maker 550 Controller Connection Procedure
Installation · Decision-Maker 550 Generator Set Controller
From a Kohler service manual — check it applies to your exact model before use.
Browse Kohler generators & specs →
Before you start
- Hazardous voltage. Will cause severe injury or death. Disconnect all power sources before opening the enclosure.
Procedure
- Place the generator set master switch in the OFF position.
- Disconnect the power to the battery charger, if equipped.
- Disconnect the generator set engine starting battery(ies), negative (--) lead first.
- Turn off and disconnect the power to all devices in the system.
- Open the enclosure and locate the connection ports as shown in Figure 6-1 and Figure 6-3.
- For RS-232 connections, use connector P18. For RS-485 connections, use the Modbus RS-485 connector P20.
- Close the controller enclosure.
- Check that the generator set master switch is in the OFF position.
- Reconnect the generator set engine starting battery, negative (--) lead last.
- Reconnect power to the battery charger, if equipped.
- Proceed to Section 13 to configure the controller's communication parameters.
Specs & values
- Connectors P19 and P21 are used for other applications
Source: Kohler service manual. Steps and values are as documented; always cross-check against the official manual and any later revisions for your exact serial number before servicing.