Nautilus

General

• The load bank is a completely self-contained, freestanding unit, which includes all resistive load elements, load control, load element branch circuit fuse protection, main load bus and terminals, valves and fittings, control power supply, malfunction detection system.

Control System

• PLC control with 8-inch color TFT touchscreen HMI. Screen is configured for local or remote operation. Remote requires 120v power source.

Control Function

• Master control on-off button; keypad entry of load values, apply and remove buttons; controller calculates reduced voltage load values automatically, applying actual requested load value for the applied voltage up to the reduced voltage capacity of the load bank. Water Flow Control: Either full on or thermostatic control. Thermostatic control is either manual or to a temperature rise preset. Operator interface is a screen based vernier valve control with displays of valve position, flow rate, temp in, temp out, temp rise. Automatic thermostatic control allows operator to enter value of temp rise. Controller then adjusts flow rate to maintain that rise. Controller inhibits over temperature, greater than 180°F outlet temp. Displays: AC 3-phase voltage and current, frequency, kilowatts. Alarms: high outlet temp, low flow, high pressure Messages: normal operation, valve open, valve closed. Water Flow Control Messages: water inlet temp, water outlet temp, overall temp rise, main manifold water flow rate, valve position in percent of open.

Load Cell

• 1 x 250 kW load, consisting of heavy-gauge, steel housing, load elements, control valves and sensors as described below

Load Elements

• Immersion type, tubular construction, stainless steel or Incolloy sheathed, chromium-alloy conductor. Screw-plug mounting.

Load Control

• Triac and Branch circuit contactors, each 25 kw or 50 kW circuit.

Element Circuit Protection

• Branch circuit fuses, each 50-kW branch circuit or each step.

Power Wiring

• 150°C insulated; color-coded and numbered, XLP insulation

Control Wiring

• 90°C, color-coded and numbered.

Power Connection

• Cam-Type connectors, 1 x 4/0 (400A) per phase and 1 x ground. Bulk-head mount connectors installed on front.

System Protection

• Sensors: Protection for High water temperature; Low water flow; High pressure. Alarm and shutdown upon failure detection

Sensors

• Main manifold flow transducer, 4-20mA; inlet water temp thermocouple, exhaust water temp thermocouple; cell pressure.

Enclosure

• Type 1 indoor freestanding. Approx 24” W x 72” H x 36” D.

Water Flow Control

• Equipped with main inlet and outlet shutoff ball valves, pressure relief valve. Motorized gate valve on inlet for water flow control.

Capacity	250KW
Load Type	Resistive
Power Factor	1.0
Voltages	480V AC, 3‑phase, 3‑wire
Frequency	60 Hz
Load Steps	Infinitely variable via digital control
Duty Cycle	Continuous
Ambient Temperature	52°C
Control Power	External, via power inlet and power cord to 120V 15A outlet
Cooling Requirements	Fresh water; Nominal 125 GPM supply yields approx. 12.5°F rise at full power; Flow rate is infinitely variable to a max temp rise not to exceed 180°F outlet. KW = GPM x Temp. Rise (F) x 0.16 GPM = KW / (Temp. Rise x 0.16) Temp. Rise (F) = KW / (GPM x 0.16)
Weight	Approximately 1600 lbs full of water, 900 lbs dry
Water Connection	2‑inch water inlet and outlet with quick disconnect couplings and shutoff ball valves
Enclosure	Environmental type 1 freestanding, indoor, portable enclosure. Aluminum frame clad with aluminum panels and doors. Front power connections, rear water connections, casters, forklift pads, lifting eyes. Powder coated white cabinet with blue doors. Dimensions: 72"H x 24"W x 36"D

• Nautilus 250KW Water-Cooled Load Bank - Product Brochure

• Software for control from a Windows- based PC, for data acquisition and for full testing automation