Generac MPSG350 Application, Engineering Data, Connection Cabinet Optional, System Configuration

APPLICATION	MPSG 350
& ENGINEERING DATA

Modular Paralleling System MPSG 350

System Description

The Generac control system consists of the Power Manager™ System Controller (PM-SC) or the Power Manager Integrated Controller ()PM-IC) along with the Power Manager Generator Controller (PM-GC). For single transfer switch installations with the Generac Transfer Switch, the PM-IC is integral with the transfer switch. For multiple transfer switch installations, the PM-SC interfaces with the PM-GC to provide start/stop commands based on utility power, proportional load sharing and safe paralleling of each individual genset to the main bus or transfer switch. Each individual genset has a built in heavy duty switch to complete the paralleling operation. This switch and it's control system replace the high cost switchgear and motor operated circuit breakers associated with standard paralleling systems.

System Components

Power Manager Generator Controller (PM-GC)

This control is installed on the generator set and monitors all the engine parameters, including oil pressure, coolant temperature, overspeed, kW and power factor.

It also controls the governor, voltage regulator and the synchronizing connection to the bus.

Paralleling Switch

Installed in the generator set connection box Heavy duty 3 pole solenoid actuated, mechanically held, with emergency trip to off position

Rated at 400 amps and 1000 amps continuous 35,000 and 42,000 amps interrupting capacity Built in arc suppression

Power Manager System Control (PM-SC)

Up to 3 primary transfer switches with up to 6 individual steps for load sequencing, application or shedding with assignable kW values for each step in addition to the critical load ATS.

Unlimited number of secondary slave switches

The PM-SC is in an enclosure separate from the transfer switches.

Power Manager Integrated Control (PM-IC)

Integrated Control (IC) is installed in the same enclosure as the single Generac Transfer Switch

Features: PM-IC & PM-SC

Programmable and viewable via Genlink Provides up to 3 load shed contacts Failsafe protective functions for reverse power and synchronous paralleling control.

``Exercise controller Backup battery

RS232 for Modem connection RS485 Data Highway

Transfer Switch (PM- IC System )

1000 amp,1600 amp, 2600 amp (UL)3200 Amp (non UL) For smaller switch ratings use the PM-SC control

42,000 AIC – 1000 Amp, 65,000 AIC – 1600 Amp, 85,000 AIC – 2600 - 3200 Amp

NEMA 12/3R enclosure

66"H x 36"W x 30" D – 1000 Amp

78"H x 48"W x 24" D – 1600 Amp

80” H x 48” W x 48” D – 2600 –3200 Amp Wire access – top, side, bottom

NEMA 3R or 4X Optional

Wt. 1250 lbs. –1000-1600 Amp. 1850 lbs. 2600-3200 Amp

Connection Cabinet ( Optional )

NEMA 12/3R

80” H x 48” W x 48” D

Lug capacity –16 for Generator Controller (GC), 12 for ATS. Each lug accepts (4) #4 to 750 MCM ( see Dwg. OD4482) Floor mounting

Aluminum or Copper Wire compatible – 4500 amp bus

Sequence of Operations

1.The PM-IC or a transfer switch in the PM-SC configuration detects a Utility failure and issues a start command. In the PM-IC, the command goes direct to each PM-GC and with multiple transfer switches the command goes to the PM-SC which then issues a start command to the PM-GC's

2.Each Generator will start on its own.

3.The first generator that attains rated frequency and voltage is connected to the main bus or transfer switch terminals via the paralleling switch n the individual genset.

4.The remaining generators will synchronize with the bus and the respective paralleling switch will close into the bus.

5.When all the gensets are paralleled to the main bus, the System or Integrated Controller will signal the transfer switch to transfer to the load. If multiple transfer switches are installed, the PM-SC will connect these switches in 3 separate programmed steps.

6.If a NFPA requirement for 10 second start exists, the first unit connects to the bus. This causes the controller in a separate emergency transfer switch to immediately transfer to the NFPA load.

7.If a single generator fails, load shed contacts are available to disconnect selected non critical loads.

8.If load conditions are reduced, (night time operation) selected generators can be programmed off line.

9.When Utility supply returns, the PM-SC or PM-IC will issue commands to transfer loads back to the Utility. If then issues commands to the individual PM-GC’s to disconnect from the bus. Each PM-GC will operate its generator for the cool- down period and then issue a shutdown command.

System Configuration

Any KW configuration that equals the required load kW can be used. The following page details a common engine configuration and the most economical

configuration utilizing the MG150, MG200. But, depending on load parameters any number of units up to 10 can be paralleled together.

Additional units and transfer switches can easily be added at a later date.

Ratings definitions : See Generac Power Systems "Power Rating Guidelines" for specific definitions and application guidelines of the Standby Power, Prime Power and Continuous Power Ratings. Prime Power is not available at this time for MPS units.