7 Top Level Module Removal Instructions
7.1 Before Proceeding
7.1.1 High Voltage Warning
WARNING
Frequency converters contain dangerous voltages when
connected to mains voltage. No disassembly should be
attempted with power applied. Remove power to the
frequency converter and wait at least 40 minutes to let the
frequency converter capacitors fully discharge. Only a
competent technician should carry out service. Failure to
fully discharge capacitors could result in serious injury or
death.
NOTE
ELECTROSTATIC DISCHARGE (ESD)
Many electronic components within the frequency
converter are sensitive to static electricity. Voltages so low
that they cannot be felt, seen or heard can be harmful to
electronic components. Use standard ESD protective
procedures whenever handling ESD sensitive components.
Failure to conform to standard ESD procedures can reduce
component life, diminish performance, or completely
destroy sensitive electronic components.
7.1.3 Optional Circuit Breaker or
Disconnect Switch
NOTE
The following options are powered before the optional
circuit breaker or disconnect. Even with the circuit breaker
or disconnect in the OFF position, mains voltage is still
present inside the frequency-converter cabinet.
•
Door interlock
•
Space heater
•
Cabinet light and outlet
•
RCD monitor
•
IRM monitor
•
Emergency stop
•
24 VDC customer power supply
NOTE
If supplied with a circuit breaker or disconnect switch, the
cabinet doors are interlocked. To open the cabinet doors,
the circuit breaker and disconnect switch must be in the
OFF position.
NOTE
Inverter units contain 2 or 3 inverter modules. Drawings in
this section illustrate units with 2 inverter modules.
Changes in instructions for units with 3 modules are noted.
7.1.4 Tools Required
Operating Instructions for the FC Series frequency
converter
Metric socket set
7–19 mm
Socket extensions
100 mm–150 mm (4 in and 6 in)
Torx driver set
T10 - T50
Torque wrench
0.675–19 Nm (6–170 in-lbs)
Needle nose pliers
Magnetic sockets
Ratchet
Hex wrench set
Screwdrivers
Standard and Philips
Additional Tools Recommended for Testing
Digital volt/ohmmeter (must be rated for 1200 VDC for 690 V units)
Analog voltmeter
Oscilloscope
Clamp-on style ammeter
Test cable p/n 176F8766
Signal test board p/n 176F8437
Power supply: 610 - 800 VDC, 250 mA to supply external power to 4
power cards and the control card.
Power supply : 24 VDC, 2 A for external 24 V power supply.
Top Level Module Removal In...
High Power Service Manual for Modular F Frame Drives
102
MG90K202 - VLT
®
is a registered Danfoss trademark
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