Before Commencing Repair Work; Special Conditions; Avoid Unintended Start; Safe Torque Off (Sto) - Danfoss VLT AQUA FC 202 Operating Instructions Manual

Safety
WARNING
Leakage Current
The earth leakage current from the frequency converter
exceeds 3.5 mA. According to IEC 61800-5-1 a reinforced
Protective Earth connection must be ensured by means
of: a min. 10mm² Cu or 16mm² Al PE-wire or an
addtional PE wire - with the same cable cross section as
the Mains wiring - must be terminated separately.
Residual Current Device
This product can cause a D.C. current in the protective
conductor. Where a residual current device (RCD) is used
for extra protection, only an RCD of Type B (time
delayed) shall be used on the supply side of this
product. See also RCD Application Note MN.90.GX.02.
Protective earthing of the frequency converter and the
use of RCD's must always follow national and local
regulations.

2.1.2 Before Commencing Repair Work

1. Disconnect the frequency converter from mains.
2. Disconnect DC bus terminals 88 and 89.
3. Wait at least the time mentioned in
chapter 2.1.1 General Warning.

2.1.3 Special Conditions

Electrical ratings
The rating indicated on the nameplate of the frequency
converter is based on a typical 3-phase mains power
supply, within the specified voltage, current and
temperature range, which is expected to be used in most
applications.
The frequency converters also support other special
applications, which affect the electrical ratings of the
frequency converter. Special conditions which affect the
electrical ratings might be:
•
Single phase applications
•
High temperature applications which require
derating of the electrical ratings
•
Marine applications with more severe environ-
mental conditions.
Consult the relevant clauses in these instructions and in
the Design Guide for information about the electrical
ratings.
Installation requirements
The overall electrical safety of the frequency converter
requires special installation considerations regarding:
•
Fuses and circuit breakers for over-current and
short-circuit protection
•
Selection of power cables (mains, motor, brake,
loadsharing and relay)
VLT AQUA Drive FC 202 Operation Instructions
•
•
Consult the relevant clauses in these instructions and in
the Design Guide for information about the installation
requirements.
WARNING
The frequency converter's DC link capacitors remain
charged after power has been disconnected. To avoid an
electrical shock hazard, disconnect the frequency
converter from the mains before carrying out
maintenance. Before doing service on the frequency
converter, wait at least the amount of time indicated
below:
Voltage
380 - 480 V
525 - 690 V
Be aware that there may be high voltage on the DC link even
when the LEDs are turned off.
Table 2.1 Discharge Time

2.1.4 Avoid Unintended Start

WARNING
While the frequency converter is connected to mains, the
motor can be started/stopped using digital commands,
bus commands, references or via the Local Control Panel.
•
•
•

2.1.5 Safe Torque Off (STO)

To run Safe Torque Off, additional wiring for the frequency
converter is required, refer to Safe Torque Off Operating
Instructions for Danfoss VLT
further information.
MG20P402 - Rev. 2013-12-16
Grid configuration (IT,TN, grounded leg, etc.)
Safety of low-voltage ports (PELV conditions)
Power size
110 - 250 kW
315 - 1000 kW
45 - 400 kW
450- 1400 kW
Disconnect the frequency converter from mains
whenever personal safety considerations make
it necessary to avoid unintended start.
To avoid unintended start, always activate the
[Off] key before changing parameters.
Unless terminal 37 is turned off, an electronic
fault, temporary overload, a fault in the mains
supply, or lost motor connection may cause a
stopped motor to start.
®
Frequency Converters for
2
Min. Waiting Time
20 minutes
40 minutes
20 minutes
30 minutes
7
2