Mitsubishi Electric fr-e700 series, Instruction Manual

Page: 240 / 608

Selection and protection of a motor Parameter
6 - 86
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 displayed 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 overload 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 6-39) when using an external ther-
mal 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 pro-
tection 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