Littelfuse 601575 Voltage Monitor Description

The model 601 is a fully-programmable voltage monitor designed to protect 3-phase motors from loss of any phase (single-phasing), phase reversal, low or high voltage, voltage unbalance, low or high frequency, and rapid cycling. It can be used as a stand-alone product or networked with an RM1000, RM2000, PLC, computer or SCADA system.

When a harmful condition is detected, the 601’s output relay is deactivated after the specified trip delay. The output relay reactivates after power line conditions return to an acceptable level for the programmed restart delay (RD2)

Eleven (11) parameters can be viewed from the three digit LED display or from a networked device:
•Low Voltage •High Voltage •Voltage Unbalance •Low Frequency •High Frequency •Trip Delay for Voltage/Frequency Faults, •Trip Delay for Single-Phase Faults, •Rapid Cycle Timer (RD1), •Restart Delay After all Faults (RD2) •Type of Restart After all Faults (Manual or Automatic).
Six parameters can be viewed as the motor is running:
•L1-L2 Voltage •L2-L3 Voltage •L1-L3 Voltage •Average Voltage •Voltage Unbalance(%) •Voltage Frequency (%).

When used with the RS485MS-2W communications module, the 601 can communicate with most Modbus RTU master devices. Voltage conditions can be monitored and setpoints can be changed remotely using Solutions software, an RM1000, RM2000 or other device.

Littelfuse 601575 Voltage Monitor Typical Applications

• Fans
• Compressors
• HVAC
• Heat Pumps
• Well Pumps
• Sump Pumps
• Small Conveyor Motors
• Oil Rigs

Littelfuse 601575 Voltage Monitor Product Features

• Protects 3-Phase Motors From:
• Loss of Any Phase (single-phasing)
• Phase Reversal
• Low Voltage
• High Voltage
• Voltage Unbalance
• Low Frequency
• High Frequency
• Rapid Cycling
• Built-In 3-Digit Display for Programming, Real-Time Information and Diagnostics
• Programmable Voltage and Frequency Settings/Parameters
• Programmable Restart Control (adjustable automatic restart or manual restart)
• Reset Pushbutton (and optional remote reset pushbutton)
• 2 Each Separate Programmable Trip Delay Timers and Restart Delay Timers
• Last Four Faults (with characteristics) Available Via 3-Digit Display, Network or Remote Displays
• RS-485 Modbus Network Communications
• Optional Remote Displays Aid in Complying with Arc-Flash Safety Regulations
• UL and cUL Listed
• 5-Year Warranty
• Made in USA

Littelfuse 601575 Voltage Monitor Product Specifications

Three-Phase Line Voltage . . . . . . . . . . . . 500-600 VAC

Frequency . . . . . . . . . . . . . . . . . . . . . 50 or 60 Hz

Programmable Operating Points

• LV-Low Voltage Threshold . . . . . . . . . . .170V (450V*) - HV Setting
• HV-High Voltage Threshold . . . . . . . . . . LV Setting - 528V (660V*)
• VUB-Voltage Unbalance Threshold . . . . . . . . . 2-15% or off
• LF-Low Frequency Threshold . . . . . . . . . 35Hz - HF Setting
• HF-High Frequency Threshold . . . . . . . . . LF Setting - 75Hz

TD1 - Trip Delay for Voltage/Unbalance/Frequency Faults . . . . . . . . . . . . . . 1-50 seconds

TD2 - Trip Delay for Single-Phase Faults . . . . . . . . . . . . . . 1-50 seconds

RD1 - Rapid Cycle Timer . . . . . . . . . . . . . . . . . . . . . 0, 2-500 seconds

RD2 - Restart Delay After All Faults . . . . . . . . . . . . 2-500 seconds

#RF-Type of Restart . . . . . . . . . . . . Manual or Automatic

ADDR-RS-485 Address . . . . . . . . . . . . A01-A99

Fixed Reset Points

• Overvoltage Reset . . . . . . . . . . .97% of HV Setting
• Low Voltage Reset . . . . . . . . . . 103% of LV Setting
• Voltage Unbalance Reset . . . . . . . . . UB Setting -1%
• Low Frequency Reset . . . . . . . . . LF Setting +0.6Hz
• High Frequency Reset . . . . . . . . . HF Setting -0.6Hz

Output Contact Rating . . . . . . . . . . . . . . . . . . . . . 480VA @ 240VAC Pilot Duty

Temperature Range . . . . . . . . . . . . . . . . . . . . . -20° to 70°C (-4° to 158°F)

Accuracy

Repeatability

Safety Marks

Weight . . . . . . . . . . . . . . . . . . . . . . . . 19.2 oz.

Mounting Method . . . . . . . . . . . Surface mount (4 - #8 screws) or DIN rail mount

*The 601 can be preprogrammed prior to installation by applying at least 120V to the L1 and L2 terminals.

*575V Model

WARNING: Cancer and Reproductive Harm - www.P65Warnings.ca.gov

Littelfuse 601575 Voltage Monitor Product Resources

Littelfuse 601575 Product Specifications

Littelfuse 601575 Installation Bulletin

Littelfuse 601575 Engineering Specifications