INFORMATION ON ACCESSORY 105 - ENGINE START CONTROLS

The ASCO series 185 Automatic Transfer Switch, with accessory 105, is designed work with most electric start generators to provide a fully automatic backup power system.

• The standard ASCO 185 is for use with two wire start generators. The standard 165 controller (without Accessory 105A or 105E) signals the generator to start by de-energizing it's "Normal" relay (NR). The relay contacts are wired to the engine-mounted starting controls, which in turn initiate the starting and stopping sequence.

• The four wire start options (acc.105A or 105E) provide cycle cranking functions into the 165 transfer switch start circuit instead of the engine controls.

• The accessory 105A was developed specifically for the Coleman Powermate. Accessory 105A is used on Coleman generator sizes 8.5kW (Model # PM0628511.01), 10kW (Model # PM0621011.01), and 15kW (Model # PM0621512.01). All other Coleman GenSets use the standard two wire control.

• Accessory 105E should be specified for all other applications that require four wire start.

• Accessory 105E is designed to work with electric start generators that DO NOT need a human to operate the choke. If you need to manually operate the choke to start your generator, accessory 105E WILL NOT WORK.

DESCRIPTION OF OPERATION for accessories 105A or 105E

The controller interfaces to the engine through two sets of relay contacts, designated the START and RUN contacts. To start the engine, the controller de-energizes both relays, which cause the engine to crank. The controller monitors the output voltage and frequency of the generator and uses a proprietary algorithm to determine when to terminate cranking. Once the engine has started, the controller re-energizes the START Relay to terminate cranking, but keeps the RUN relay de-energized. To stop the engine, the controller re-energizes the RUN relay.

If the engine fails to start after 10 seconds, the controller re-energizes both the START and RUN relays, waits 10 seconds and tries again. The controller will repeat the cycle three times and will then lock out further attempts, and generate an error condition.

Battery power must be provided to the controller on four-wire start circuits so that it remains powered during the cranking cycle.

The controller also provides over frequency shutdown of the engine. When the controller detects if the generator frequency exceeds 69hz, the controller will immediately shutdown the, display an error condition and lock out further attempts to start the engine until the alarm is cleared.