M381, NaLA coolBLUE Differential mode line absorber , VFD 41-102Hp, 40x32x15MM

M381, NaLA coolBLUE Differential mode line absorber , VFD 41-102Hp, 40x32x15MM

KEY FEATURES

• Product type: Differential mode line absorber (NaLA®) designed to further reduce VFD-generated electrical noise and peak current values

• Model: NaLA® M-381

• Application range: VFD-driven motors from 41 HP to 102 HP

• Function: Reduces differential mode noise and slows high-frequency current components to improve motor and drive system reliability

• System integration: Intended for use in conjunction with CoolBLUE® common mode choke cores for enhanced protection

• Installation method: Must be installed around each individual power cable (not grouped together like CoolBLUE® cores)

• Installation location: Installed on the load side of the VFD (inverter output) only

• Thermal rating: Normal operation below 158°F / 70°C; correct quantity required to avoid overheating

• Reliability benefit: Further reduces electrical stress on motor insulation and bearings beyond common mode filtering alone

• Maintenance: No maintenance required; solid-core construction designed for long-term service life

• Typical applications: Industrial drives, pumps, fans, HVAC systems, commercial buildings, and manufacturing environments

QUANTITY GUIDELINE – NaLA® M-381

• Applicable motor range: 41 HP to 102 HP

• Cable length: up to 150 ft / 50 m
– 1 core per power cable

• Cable length: up to 300 ft / 100 m
– 2 cores per power cable

• Cable length: up to 450 ft / 150 m
– 3 cores per power cable

• Cable length: up to 900 ft / 300 m
– 4 cores per power cable

• Installation rule:
– NaLA® cores must be installed around each individual conductor
– Do not pass multiple conductors through a single core

• System integration note:
– Always used with CoolBLUE® cores for optimal system reliability

CoolBLUE® toroids made from the nanocrystalline material NANOPERM® are
being used increasingly to reduce damaging motor bearing currents in modern
high power inverter systems operating at high switching frequencies. As a result of
these unwanted currents, the bearings corrugate, leading to electrical breakdown
in the lubrication and finally to a standstill of the entire motor.
The use of CoolBLUE® cores not only significantly reduces the over voltage peaks
at the motor terminals, but also suppresses the asymmetrical EMI currents which
are generated by the parasitic capacities of the motor itself together with the motor
cable. In order to achieve an efficient reduction in these destructive effects, one or
more CoolBLUE® cores of suitable geometry have to be placed together over the
connector cables in the DC-link as well as at the inverter output. In this configura-
tion, the cores operate as a common-mode choke.