Coupled with Web-enabled ASCO SiteWeb^TM command and control, the Soft Load Power Transfer Switch enables you to use your onsite generation unit for soft load transferring, base loading, importing or exporting.

In the soft load power transfer mode, the transfer switch synchronizes and parallels the onsite generating unit to the utility source, then immediately instructs the generating unit to assume a preset load value (Gen Minimum Load Setpoint). The Soft Load Controller then continues to control generator excitation to the preset power factor setting. It begins increasing load on the engine at a preset ramp time rate. At the point the load on the utility source drops to the cutoff value, the switch disconnects the utility feeder.

Continuous Base Loading

In the base loading mode, the generating unit operates continuously in parallel with the utility source until operation is discontinued on command. While operating, the soft load controller holds the load and power factor to the generating unit constant. Load variations are carried by the utility source. The switch retransfers the load to the utility source if the generating unit malfunctions.

Power Importing or Exporting

In the importing or exporting modes, the power transfer switch maintains the generating unit in parallel with the utility source. The switch's Soft Load Controller instructs the generating unit to produce the required output and varies the load on the unit to maintain the set import or export level. Load variations are carried by the generating unit up to the maximum generator load setting. If either the utility or the generator power fails in any of the modes, the load automatically transfers to the available source.