Service manual

1 Introduction
1.1 Purpose
This manual provides detailed technical information and
instructions to enable a qualified technician to identify
faults and perform repairs on H and I frames frequency
converters.
It provides the reader with a general view of the unit's
main assemblies, and a description of the internal
processing. This information gives technicians a better
understanding of the frequency converter's operation to
assist in troubleshooting and repair.
This manual provides instructions for the frequency
converter models and voltage ranges described in Table 1.2
to Table 1.4.
1.2 Product Overview
FC 101 frequency converters are designed for the Heating,
Ventilation, and Air-Conditioning (HVAC) markets. They
operate in variable torque mode, and include features
suited for fan and pump applications within the HVAC
market.
1.3
Safety
CAUTION
Frequency converters contain dangerous voltages when
connected to mains. Only a trained technician should carry
out the service. See also warnings in 2.1 Introduction.
CAUTION
For dynamic test procedures, main input power is required
and all devices and power supplies connected to mains are
energized at rated voltage. Take extreme caution when
conducting tests in a powered frequency converter.
Contact with powered components could result in
electrical shock and personal injury.
1. DO NOT touch electrical parts of the frequency
converter when connected to mains. Also make
sure that other voltage inputs have been discon-
nected (linkage of DC intermediate circuit). Be
aware that there may be high voltage on the DC
link even when the LEDs are turned off. Before
touching any potentially live parts of the
frequency converter, wait at least as stated in
Table 1.1.
2. Before conducting repair or inspection,
disconnect mains.
3. [Off] on the LCP does not disconnect mains.
4. During operation and while programming
parameters, the motor may start without warning.
Press [Stop] when changing data.
5. When operating on a PM motor, disconnect
motor cable.
Voltage [V] Power Range [kW]
Minimum waiting
time [min]
3x200 0.25–3.7 4
3x200 5.5–11 15
3x400 0.37–7.5 4
3x400 11–90 15
3x600 2.2–7.5 4
3x600 11–90 15
Table 1.1 Discharge Time
1.4
Electrostatic Discharge (ESD)
CAUTION
When performing service, use proper Electrostatic
Discharge (ESD) procedures to prevent damage to sensitive
components.
Many electronic components within the frequency
converter are sensitive to static electricity. Voltages so low
that they cannot be felt, seen, or heard can reduce the life,
affect performance, or completely destroy sensitive
electronic components.
Introduction
VLT
®
HVAC Basic Drive Service Manual
6 MG90X202 - VLT
®
is a registered Danfoss trademark
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