Nautilus 250R

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.

• Nautilus 250R Water-Cooled Load Bank Rental Brochure