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100

101

17 Restrictions of the drive dimensioning

17.13 Motor temperature monitoring acc. to UL 508C

434

Lenze · Drive Solution Designer · Manual · DMS 4.2 EN · 12/2013 · TD23

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17.13 Motor temperature monitoring acc. to UL 508C

UL 508C describes special requirements for the thermal protection of motors. Carry out one of the

following measures to comply with these requirements:

•I

×t motor temperature monitoring. Here, the torque must be reduced for low motor speeds

first (derating).

• Motor temperature encoder and evaluation in the inverter must be approved acc. to UL 508C.

×t motor temperature monitoring

Independent of the type of ventilation (forced ventilated, self-ventilated or naturally ventilated),

the following torque limitation must be complied with:

For f

= 0 Hz (standstill): M/M

rated

<100%

For f

=20Hz: M/M

=100%

The limitation means a derating of the motor torque. Depending on the type of ventilation of the

motor, the following derating is required:

•Self-ventilated motor

• No measures required. The available derating curves comply with the requirements.

• Forced ventilated motor

•For f

= 0 ... 20 Hz: Limit actual torque M

act

to 99 % M

rated

• Naturally ventilated motor

•For f

= 0 ... 20 Hz: Limit actual torque M

act

to 99 % M

rated

•For f

> 20 ... f

rated

: Limit actual torque M

act

to 100 % M

rated

[17-5] Torque characteristic of the motor with/without derating

 Torque characteristic of the motor in operating mode S1 (acc. to VDE 0530 or IEC 34-1)

: without derating

: with derating

act

rated

Actual motor torque - rated motor torque ratio

Field frequency

f [Hz]

40 60 80 100

100

120

140

act

/M [%]



1 2 ... 429 430 431 432 433 434 435 436 437 438 439 ... 495 496

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