6 TROUBLESHOOTING
6.1 Purpose of troubleshooting
The purpose of troubleshooting is primarily to determine whether problems are caused by the frequency
converter or external
devices. It is also possible that a faulty external device has caused damage to the
frequency converter. In that case it is very important to repair or change any faulty devices to prevent recurring
problems.
6.2 Problems and solutions
Sr.
no.
Product Suggested solution
1 The green LED is continuously ON
but motor does not run or just jerks
but control voltage can be
measured from the terminals.
Make sure that the front resistors on the control voltage circuit
have been removed or by-passed according to the instructions
in Control voltage front resistors (page 12).
2 The frequency converter does not
start (green LED stays off) when it is
started.
• Check the main voltage between terminals L1, L2 and L3.
• Check that there are no devices causing disturbance
connected to the same voltage supply as the crane. These are
for example devices that require high currents, such as big
motors or welding devices.
When the EMC screw is connected, the frequency
converter has RC filters connected to the power
supply side to reduce disturbance to the network.
The capacitors of these filters may cause the
RCD (Residual Current Device) to trip. Therefore,
using RCD with frequency converter controlled
cranes is not recommended.
3 The green LED is continuously on
or flashing (after previous fault) and
the red LED is off, but motor does
not run.
• Check the motor cable connection.
• Check the limit switches.
• Check the voltage in direction command terminal 1 (DI1) and
terminal 2 (DI2) against the common (terminal 7).
4
The motor runs poorly: trolley/bridge
does not move as it supposed to
move.
• Check that the load is not over nominal.
• Check that all cables are correctly connected and not loose.
• Check that all motor parameters are correctly set.
• Check that the U/f-curve parameters (switch group S6) are
correctly set.
• Check that the switch group S4 switch -2 is set to 1 and group
S5 switches are set to 11.
• Check that the switch group S7 switches are set to 010.
• Check that the motor’s brake opens completely.
R&M Materials Handling, Inc.
4501 Gateway Boulevard
Springfield, Ohio 45502
P.: (937) 328-5100
FAX: (937) 325-5319
27/28
R&M Materials Handling, Inc. reserves the right to alter or amend the above information without notice.
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