Frequently Asked Questions

Which gensets can be paralleled and what are some possible configurations?

Diesel Gaseous MQT-Gaseous Gemini Bi-Fuel MD300 MD400 MD500 MD600 *MPS Systems can consist of any combination of diesel gensets, up to a maximum of 10 units.   Rated Amps @ 60 Hz   Output 208V 3ø 0.8 pf 480V 3ø 0.8 pf 600V 3ø 0.8 pf Examples 800 kW n/a 1203 962 2 - 400 kW 900 kW n/a 1353 1083 1 - 500 kW 1 - 400 kW 1000 kW n/a 1504 1203 2 - 500 kW 1200 kW n/a 1804 1443 2 - 600 kW 1300 kW n/a 1955 1564 2 - 400 kW 1 - 500 kW 1500 kW n/a 2255 1804 1 - 300 kW 2 - 600 kW 1800 kW n/a 2706 2165 3 - 400 kW 1 - 600 kW 2000 kW n/a 3007 2406 5 - 400 kW 2400 kW n/a 3608 2887 4 - 600 kW 2500 kW n/a 3759 3007 5 - 500 kW 3000 kW n/a 4511 3609 5 - 600 kW 6000 kW n/a 9022 7218 10 - 600 kW

How many gensets can be paralleled in a single system?

An MPS system can consist of:

• Up to 15 individual diesel, gaseous or Bi-Fuel gensets
• Up to 7 Gemini Twin Packs (14 gensets)
• Up to 10 MQT100 gensets
• Up to 10 MQT150 gensets

Must all of the gensets in a system have the same kW rating?

Individual gensets with different kW ratings can be used within a single system. The only exceptions are the MQT gensets which can only be paralleled with other MQT units with the same kW rating.

What kind of paralleling switchgear is required for an MPS system?

Generac MPS is a completely integrated system, so no additional switchgear is needed. Our PowerManager® Digital Control Platform features a 32-bit microprocessor and replaces multiple generator controllers and expensive paralleling switchgear. The PowerManager G-Series is a flexible control platform that utilizes mission-specific software that enables it to function as the controller for the individual gensets, an integrated paralleling controller and the system controller.

How does MPS facilitate internal and external communications?

The PowerManager G-Series features integrated PLC functions and numerous I/Os that make it easy to customize controls and link directly with facilities management systems. Two Modbus RS 485 ports accommodate controller-to-generator and controller-to-annunciator or building management system communications. An integrated Ethernet modem with an RS232 port provides remote computer interface and control using our GenLink® software.

What happens if one of the gensets does not start or is lost after transfer?

The PowerManager System G-Series System Controller has ATS permissive relays. If the loads are prioritized among two or more transfer switches, the permissive controls will not allow lower priority loads to switch to emergency power and the critical load is automatically spread among the remaining gensets. If transfer has already occurred, lower priority loads are immediately shed and the critical load is carried by the remaining gensets.

How many automatic transfer switches can be used in a single system?

There is no limit on the number of open transition, closed transition or bypass isolation switches that can be used within a system. Only one soft load switch can be used.

Can the G-Series System Controller interface with third party transfer switches?

Yes, provided that the switches have a two-wire start, can be mechanically held in the neutral position by the controller for load shedding and can be inhibited by the controller from switching to the emergency position until adequate generator power has come onto the generator bus.

Do all of the gensets have to be placed together?

No. Generac MPS gensets can be separated to allow you to better utilize available space. It is possible to place some units on the ground and others on the roof, or to utilize multiple smaller spaces without affecting performance. The location of the system controller is limited to no more than 1500 feet by the RS-485 communication cable.

Are Modular Power Systems being used in mission critical applications?

Yes, these systems are fully compliant with NEC 700 and NFPA 110. Mission critical applications represent a significant percentage of MPS installations.

What are some examples of other types of applications utilizing MPS?

Here is a breakdown of MPS applications.