Littelfuse 601575, 601 Series, Voltage Asymmetry, Phase Loss, Phase Sequence 500 ~ 600VAC
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The 601 series is a fully-programmable voltage monitor designed to protect three-phase motors from loss of any phase (single-phasing), phase reversal, low- or high-voltage, voltage unbalance, low- or high-frequency, and rapid cycling. 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). This monitor can be used as a stand-alone product or networked with an RM-1000, RM-2000, PLC, computer, or SCADA system.
Eleven setpoints are viewable with the three-digit LED display or from a networked device:
• low voltage • trip delay for voltage/frequency faults
• high voltage • trip delay for single-phase faults
• voltage unbalance • rapid-cycle timer (RD1)
• low frequency • restart delay after all faults (RD2)
• high frequency • type of restart after all faults
• RS485 address (manual or automatic)
Six parameters are viewable while the motor is running:
• L1-L2 voltage • average voltage
• L2-L3 voltage • voltage unbalance (%)
• L1-L3 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.
Applications
• Oil rigs
• Compressors and fans
• HVAC
• Heat, well, and sump pumps
• Small conveyer motors
The 601 can be preprogrammed prior to installation by applying at least 120 V to the L1 and L2 terminals. *575 V model
Specifications
| Input Characteristics | |
| Frequency | 50/60 Hz |
| Functional Characteristics | |
| Programmable Operating Points | |
| LV - Low Voltage Threshold | 170 V (450 V*) - HV Setting |
| HV- High Voltage Threshold | LV Setting - 528 V (660 V*) |
| VUB - Voltage Unbalance Threshold | 2–15% or off |
| LF - Low Frequency Threshold | 35 Hz - HF Setting |
| HF - High Frequency Threshold | LF Setting - 75 Hz |
| 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 Rese | 97% of HV Setting |
| Low Voltage Reset | 103% of LV Setting |
| Voltage Unbalance Reset | UB Setting -1% |
| Low Frequency Reset | LF Setting +0.6 Hz |
| High Frequency Reset | HF Setting -0.6 Hz |
| Output Characteristics | |
| Output Contact Rating Pilot Duty | 480 VA @ 240 V ac |
| General Characteristics | |
| Temperature Range | -20° to 70 °C (-4° to 158 °F) |
| Accuracy |
Voltage ±1% Timing 5% ±1 second |
| Repeatability Voltage | ±0.5% |
| Maximum Input Power | 5 W |
| Transient Protection (Internal) | 2500 V for 10 ms |
| Dimensions |
H 77.47 mm (3.05”) W 97.79 mm (3.85”) D 128.27 mm (5.05”) |
| Weight | 1.2 lbs. (19.2 oz., 544.31 g) |
| Mounting Method | Surface mount (4 - #8 screws) or DIN-rail mount |
| Certification & Compliance |
UL UL 508 (File #E68520) CSA C22.2 No. 14 (File #46510) |