Motor Requirements; Motor Limits And Rules; Additional Motor Requirements; Approvals And Certifications - Danfoss VLT HVAC Drive FC 102 Operating Instructions Manual

Introduction
Non-explosive hazard zone
Frequency Converter
PTC Thermistor Card
MCB 112
+24 V
Logic Safe Stop
Out T37
DI
Control Card
91
92
93
Converter module
Illustration 1.2 Block Diagram of the System

1.6 Motor Requirements

1.6.1 Motor Limits and Rules

For every certified motor with increased safety, the
manufacturer supplies a data list including limits and rules.
During planning, installation, commissioning, operation,
and service, respect the limits for:
•
Minimum switching frequency.
•
Maximum current.
•
Minimum motor frequency.
•
Maximum motor frequency.
Furthermore, respect the following:
•
Do not exceed the maximum allowable ratio
between frequency converter size and motor size.
The typical value is I
•
Consider all voltage drops from the frequency
converter to the motor. If the motor is running
with lower voltage than listed in the U/f charac-
teristics, current might increase and cause an
alarm.
•
Multi-motor applications are not allowed. Only
connect 1 motor to the frequency converter.
MG33V302
Operating Instructions
T1
T2
TP TP
96
PTC-Sensors
97
98
3~ Ex-Motor
Potentially explosive
atmosphere
≤2xI
.
VLT, n m,n
Danfoss A/S © 01/2015 All rights reserved.

1.6.2 Additional Motor Requirements

The Ex-e motor must be approved for operation in
hazardous zones (ATEX Zone 1/21, ATEX Zone 2/22) in
combination with frequency converters. The motor must
be certified for the particular hazardous zone.
The Ex-n motor must be approved for operation in
hazardous zones (ATEX Zone 2/22) in combination with
frequency conveters. The motor must be certified for the
particular harzardous zone.
NOTICE
The motor can be placed in Zone 1/21 or 2/22 according
to motor approval. The frequency converter must always
be installed outside of the hazardous zone.
•
Only operate explosion-protected 3-phase motors
with frequency converters, if the motors are built,
tested, approved, and labelled separately for this
mode.
•
When the usage of the motor and its thermal
protective device are approved for frequency
converter operation, use the MCB 112 for each
ignition protection system for all motor types. For
motors of Ex-e and Ex-n-type ignition protection,
which are OEM-approved for frequency converter
operation in Ex-harzardous areas, consider and
use the requested limitations in the frequency
converter's ATEX ETR thermal monitoring settings.
•
The necessary parameters and conditions can be
found on the nameplate or the documentation of
the motor. To prevent prohibited temperatures,
the motors are equipped as standard with
thermal winding protection, which has to be
evaluated by a suitable device like MCB 112. The
motors must not be operated as a group drive.

1.7 Approvals and Certifications

Certificates and declarations of conformity are available.
Contact a local Danfoss partner.
Certification number:
PTB 14 ATEX 3012U
5
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