Multifunction Protection and Switchgear Control unit REF542plus
Manual: Motor Protection with ATEX-Certification
After recovering of the auxiliary voltage the following temperature will be used for con-
tinuing the operation of the motor protection:
CCT °=°
⎟
⎟
⎟
⎠
⎞
⎜
⎜
⎜
⎝
⎛
+= 9640e40) -141(ini
1026s
600s
-
where:
td Duration of the failure of the auxiliary voltage
Tfail Temperature at the moment failure occurrence
Tenviro Setting of the environmental temperature
TimeConst I < 0.1 Ie Setting of the time constant for cooling down the motor at
standstill
Tini Initialtemperature for the continuation of the protection task
1VTA100114-Rev. 04 en PTMV, 19.01.05 Motorprotection 37 / 66
Valid from Version V4D02
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