Vacon OPTAF, User Manual

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vacon • 44 THERMISTOR FUNCTION (ATEX)
Local contacts: https://www.danfoss.com/en/contact-us/contacts-list/
According to the curve, when the temperature falls below 2 k
Ω
(see Figure 18), the thermistor func-
tion allows the drive to be enabled again.
The thermistor fault configuration cause following reactions:
• Response to thermistor fault = No action. No warning/ fault is generated in case of overtem-
perature. The drive goes to run disable mode. The drive can be restarted when temperature
is normalized, by giving a valid start command.
• Response to thermistor fault = Warning. A29 is generated in case of overtemperature. The
drive goes to run disable mode. The drive can be restarted when temperature is normalized
by giving a valid start command when the drive has returned to Ready state.
• Response to thermistor fault = Fault. F29 is generated in case of overtemperature and the
drive goes to run disable mode. When the temperature is normalized, a reset command is
needed before the drive can be restarted. The drive returns to Ready state. The valid start
command is then needed to restart the drive.
NOTE! With OPTAF board according to ATEX directive 94/9/EC (i.e jumper wire X12 not cut) all
VACON
®
NXP drives are programmed to accept only an edge sensitive start command for a valid
start after a thermistor fault. To start the motor operation, a new start command is required after
the drive returns to ready state.
4.2.3 Short circuit monitoring
The thermistor inputs TI1+ and TI1- are monitored for short circuit. If a short circuit is detected, the
drive modulation is disabled within 20ms, F8 system fault (subcode 31) is generated. When the short
circuit has been removed, the drive can be reset only after power recycle to the VACON
®
NXP con-
trol board.
The short circuit monitoring can be enabled or disabled using the jumper X10 in ON or OFF position
respectively. The jumper is set in ON position by factory default.
4.2.4 Exceptional use of thermistor function on OPTAF board (similar to
OPT-A3, not in compliance with ATEX directive 94/9/EC)
In systems where the drive detects the overtemperature of the motor through a thermistor input,
there might be a need of running down the whole system in a controlled way or continue running
the motor. In these cases the thermistor input must not cause an immediate stop of the drive. To
achieve this functionality, the following actions must be carried out:
• Cut the jumper wire X12 on OPTAF board.
• Set the jumper X10 to OFF position (short circuit monitoring disabled).
• Set the parameter Expander Boards/Slot B/ “Therm Trip (HW)” to “Off”.
Important: For the functionality of OPTAF board according to ATEX directive 94/9/EC, it
must be checked that the jumper wire X12 is not damaged or cut . Also set the param-
eter Expander Boards/Slot B/ "Therm Trip (HW)" to "ON" (P.7.2.1.1).
WARNING : When the jumper wire X12 is cut, the OPTAF board is not
more valid for using in an environment that requires a certified over-
heating protection device according to the ATEX directive 94/9/EC.
13006 emf