•
•
•
-
-
•
-
-
•
•
•
•
motors in ATEX areas. This function makes it possible to enter a specic curve to protect the Ex-e motor. See the Programming Guide
for set-up instructions.
6.2.3 Motor Thermal Protection for Ex-e or Ex-n Motors
The drive is equipped with an ATEX ETR thermal monitoring function for operation of Ex-e or Ex-n motors according to EN 60079-7.
When combined with an ATEX-approved PTC monitoring device such as the VLT® PTC Thermistor Card MCB 112 or an external de-
vice, the installation does not require an individual approval from an approbated organization.
The ATEX ETR thermal monitoring function enables use of an Ex-e or Ex-n motor instead of a more expensive, larger, and heavier Ex-
d motor. The function ensures that the drive limits motor current to prevent overheating.
Requirements related to the Ex-e motor
N O T I C E
Install the drive outside the hazardous zone.
Ensure that the Ex-e motor is approved for operation in hazardous zones (ATEX zone 1/21, ATEX zone 2/22) with drives. The
motor must be certied for the specic hazardous zone.
Install the Ex-e motor in zone 1/21 or 2/22 of the hazardous zone, according to motor approval.
Ensure that the Ex-e motor is equipped with an ATEX-approved motor overload protection device. This device monitors the tem-
perature in the motor windings. If there is a critical temperature level or a malfunction, the device switches o the motor.
The VLT® PTC Thermistor MCB 112 option provides ATEX-approved monitoring of motor temperature. It is a prerequisite that
the drive is equipped with 3–6 PTC thermistors in series according to DIN 44081 or 44082.
Alternatively, an external ATEX-approved PTC protection device can be used.
Sine-wave lter is required when the following apply:
Long cables (voltage peaks) or increased mains voltage produce voltages exceeding the maximum allowable voltage at mo-
tor terminals.
Minimum switching frequency of the drive does not meet the requirement stated by the motor manufacturer. The mini-
mum switching frequency of the drive is shown as the default value in parameter 14-01 Switching Frequency.
Compatibility of motor and drive
For motors certied according to EN-60079-7, a data list including limits and rules is supplied by the motor manufacturer as a data-
sheet, or on the motor nameplate. During planning, installation, commissioning, operation, and service, follow the limits and rules
supplied by the manufacturer for:
Minimum switching frequency.
Maximum current.
Minimum motor frequency.
Maximum motor frequency.
The requirements are indicated on the motor nameplate, see Illustration 32.
AJ300847815559en-000101 / 130R033746 | Danfoss A/S © 2020.09
Product Features
VLT® AQUA Drive FC 202
Design Guide
To Next Page
Loading...
Need help?
General