P21NRXB-LNN-NS-00

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The P21NRXB-LNN-NS-00 is manufactured by Pacific Scientific as part of the Powermax II P stepper motor series. It features a thermal resistance of 5.5 Mounted °C/Watt and rotor intertia of .012 (kg-m²x10¯³). These are the most powerful stepper motors with a holding torque of .82 Nm and a detent torque of .028 Nm.

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Product Description:

Pacific Scientific is a brand that has been a reputable company. While they discontinued their range of motion control and automation technologies, they were acquired by Kollmorgen who maintained the Pacific Scientific branding and even developed some new products that were branded with the same name. The POWERMAX II series of stepper motors by Pacific Scientific is able to provide one of the highest torque per motor size and speed range. All motors under this series are NEMA 23 (60mm) and have multiple options that can be customized to fit the customers specific needs.

The P Series in the POWERMAX II range features SIGMAX technology that allows for even higher torque and acceleration. All of Pacific Scientific’s stepper motors are able to cover a broad range of linear motion applications. By practicing high-quality and innovative designs, Pacific Scientific is able to manufacture tough and reliable motors, regardless of their size and application. The POWERMAX II series by Pacific Scientific continues to set a high standard for all NEMA 23 stepper motors. With up to 252 in of holding torque, Pacific Scientific ensures that all their stepper motors are powerful and can also be customized to your specifications.

The P21NRXB-LNN-NS-00 is a P Series POWERMAX II Hybrid Step Motor manufactured under the brand name of Pacific Scientific. The P21NRXB-LNN-NS-00 motor is characterized by a size of NEMA 23 with 1 stack. The mounting for the P21NRXB-LNN-NS-00 stepper motor is NEMA and it has a regular construction, similar to all other motors from the P Series POWERMAX II by Pacific Scientific. With a receptacle termination, the P21NRXB-LNN-NS-00 stepper motor has an assigned letter winding type, allowing it to be used for a wide range of applications. Pacific Scientific’s P21NRXB-LNN-NS-00 is equipped with a standard rotor type and a single shaft configuration.

Axial Force
58N
Construction
Regular
Encoder Option/Sequence Number
No Feedback/Standard
Mounting
NEMA
Number of Stacks
1 Stack
Rotor Type
Standard
Shaft Configuration/Shaft Modifications
Single/Smooth
Size
NEMA 23
Termination
Receptacle
Winding Type
per assigned letter
  • P21 NRXB LNN NS 00
  • P21-NRXB-LNN-NS-00
  • P21NRXB LNN NS 00
  • P21NRXB-LNN-NS-OO
  • P21NRXBLNNNS00
  • P21NRXBLNNNSOO
Error / Symptom Likely Cause Recommended Troubleshooting Step
Motor will not start (no rotation) No power, open circuit, or mis-wired phases Verify supply voltage, continuity on all four phase leads, and correct phase pairing/driver wiring
Motor starts but stalls or “misses steps” under load Acceleration too aggressive or drive current too low Reduce acceleration ramp; raise drive current within name-plate rating
Strong vibration / resonance at certain speeds Natural resonance of rotor & load inertia mismatch Add micro-stepping, change step rate quickly through resonant band, or fit a damping collar
Excessive motor housing temperature Drive current set too high or airflow restricted Check current-limit dip-switches; provide heatsink or fan to keep case ≤ 100 °C
Audible “grinding” or chatter noise Loose motor mounting or mechanical mis-alignment Rigidly bolt motor to grounded plate; realign couplings and check shaft concentricity
Motor turns in the wrong direction Phase pair order reversed Swap A+ with A- (or B+ with B-) or invert direction pin logic
Low holding torque; load “creeps” at stand-still Drive in standby mode or insufficient current Disable low-power idle; set holding current ≥ 50 % of rated
Speed hunts / fluctuates Electrical noise on step/dir lines Use shielded twisted pairs; add proper grounding & opto-isolation
Driver “over-current” or “thermal” fault LED Shorted motor lead or drive over-temperature Ohm-check windings for shorts; let driver cool, verify fan operation
Shaft binds or will not turn freely by hand (power off) Bearing wear or foreign debris ingress Remove motor, inspect bearings; clean or replace if roughness is felt
Part Number Winding Code Holding Torque (oz-in / Nm) Rated Current (A/phase) Phase Resistance (Ω) Phase Inductance (mH)
P21NRXB-LNN-NS-00 B 79 / 0.56 3.3 0.64 1.1
P21NRXA-LNN-NS-00 A 81 / 0.57 4 0.46 0.8
P21NRXC-LNN-NS-00 C 82 / 0.58 2.5 1.06 2.3
P21NRXD-LNN-NS-00 D 77 / 0.54 1.07 5.22 10.3
P21NRXHA-LNN-NS-00 H-A (high-torque) 114 / 0.81 5.6 0.23 0.8
P21NRXHB-LNN-NS-00 H-B (high-torque) 111 / 0.78 4.6 0.32 1.1
Code Fault Condition
F01 Line-to-line short (over-current)
F02 Line-to-neutral short
F03 Bus over-voltage > 75 V DC
F04 Internal under-voltage < 24 V DC
F05 Output over-temperature
F06 Motor phase open-circuit
F07 Step-input noise / illegal pulse width
F08 Illegal DIP-switch combination
F09 EEPROM parameter checksum error
F10 Watch-dog timeout / firmware hang

Frequently Asked Questions about P21NRXB-LNN-NS-00:

Q: What series does the P21NRXB-LNN-NS-00 motor belong to?

A: The P21NRXB-LNN-NS-00 is part of the P Series POWERMAX II Hybrid Step Motors under the Pacific Scientific brand.

Q: What is the size and stack configuration of the P21NRXB-LNN-NS-00?

A: This motor is characterized by a NEMA 23 size with a 1 stack configuration.

Q: How is the mounting for the P21NRXB-LNN-NS-00 motor designed?

A: The motor's mounting follows the NEMA standard, consistent with the P Series POWERMAX II.

Q: What type of termination does the P21NRXB-LNN-NS-00 stepper motor feature?

A: It has a receptacle termination and an assigned letter winding type suitable for diverse applications.

Q: What is the rotor and shaft configuration of this motor?

A: The P21NRXB-LNN-NS-00 features a standard rotor type with a single shaft configuration.


Internal Product Review

  • ‘‘The P21NRXB-LNN-NS-00 showcases a consistent performance during hard operations. A versatile choice for diverse applications.’’

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