Mitsubishi Electric FREQROL Manuel d'instructions télécharger pdf (Page 224)

100

101

Selection and protection of a motor Parameter

6 - 84

Electronic thermal relay function prealarm (TH) and alarm signal (THP signal)

The alarm signal (THP) is output and electronic thermal relay function prealarm (TH) is dis-

played when the electronic thermal O/L relay cumulative value reaches 85% of the level set in

Pr. 9 or Pr. 51. If it reaches 100% of the Pr. 9 "Electronic thermal O/L relay setting", a motor over-

load trip (E.THM) occurs.

For the terminal used for the THP signal output, assign the function by setting "8 (positive logic)

or 108 (negative logic)" in any of Pr. 190 to Pr. 192 "Output terminal function selection".

External thermal relay input (OH signal)

To protect the motor against overheat, use the OH signal (refer to Fig. 6-39) when using an ex-

ternal thermal relay or the built-in thermal protector of the motor.

When the thermal relay operates, the inverter trips and outputs the fault signal (E.OHT).

For the terminal used for OH signal input, assign the function by setting "7" to any of Pr. 178 to

Pr. 184 "Input terminal function selection".

NOTE The prealarm signal "THP" is also issued as soon as the thermal load of the IGBT output

stages of the frequency inverter is 85%. If the load rises further up to 100%, then the thermal

overload protection of the frequency inverter responds and the "E.THT" error message is

shown.

I001138E

Fig. 6-38: Prealarm signal output

NOTE Changing the terminal assignment using Pr. 190 to Pr. 192 "Output terminal function

selection" may affect the other functions. Make setting after confirming the function of each

terminal.

Fig. 6-39:

Connection of an external thermal relay

I000553C

NOTE Changing the terminal assignment using Pr. 178 to Pr. 184 "Input terminal function

selection" may affect the other functions. Make setting after confirming the function of each

terminal.

Electronic thermal relay function

operation level

Time

ON ON

Electronic thermal O/L relay prealarm THP

1 2 ... 219 220 221 222 223 224 225 226 227 228 229 ... 523 524

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Mitsubishi Electric FREQROL Manuel d'instructions Page 224

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