Munters HCUw, Эксплуатация и техническое обслуживание

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54
3G3JV Maintenance Operations
Chapter7
7
•
The frequency reference is too low.
If the frequency reference is set below the minimum output frequency set in n14, the Inverter
will not operate.
Raise the frequency reference to at least the minimum output frequency.
•
The Inverter is in local mode.
The Inverter in local mode starts with the RUN command given with the RUN Key pressed.
Check the LO/RE indicator. If the display is
"Lo,"
the Inverter is in local mode. Press the
Increment Key and set the Inverter to remote mode with
" r E "
displayed.
If the above operation is not possible, a multi-function input is set to local/remote selection. In
that case, the mode can be changed with the multi-function input only. Turn the corresponding
input terminal OFF so that the Inverter will be set to remote mode.
•
The wiring on the Inverter control circuit terminals is incorrect.
The Inverter cannot check input signals if the input wiring on the control circuit terminals is
incorrect. Operate the Digital Operator and check the input terminal status of multi-function
monitor U06. The NPN or PNP input sequence is selectable. The NPN input sequence is the
default setting. Refer to 2-2-2 Terminal Block and check that the setting of switch SW7 and
wiring are correct.
„
The motor does not operate with input through the control
circuit terminals. (The frequency reference is zero or different
from the set value.)
•
The frequency reference setting is incorrect.
The analog input of frequency references is ignored with the Digital Operator selected. The
digital input of frequency references is ignored unless the Digital Operator is selected.
Check that the setting in n03 for frequency reference selection coincides with the actual
method of giving frequency instructions.
Before using analog input, refer to
2-2-2 Terminal Block and check that the setting of SW8 and
the actual method (with voltage and current) of providing frequency references are correct.
•
The Inverter is in local mode.
Frequency references can be provided only through key sequences on the Digital Operator or
with the FREQ adjuster to the Inverter in local mode.
Check the LO/RE indicator. If the display is
"Lo,"
the Inverter is in local mode. Press the
Increment Key and set the Inverter to remote mode with
" r E "
displayed.
If the above operation is not possible, the multi-function input will be set to local/remote
selection. In that case, the mode can be changed with the multi-function input only. Turn the
corresponding input terminal OFF so that the Inverter will be set to remote mode.
•
The analog input gain or bias setting is incorrect.
Check that the frequency reference gain in n41 and frequency reference bias in n42 are set
according to the actual analog input characteristics.
„
The motor stops during acceleration or when a load is connected.
•
The load may be too big.
The 3G3JV has a stall prevention function and automatic torque boost function, but the motor
responsiveness limit may be exceeded if acceleration is too rapid or if the load is too big.
Lengthen the acceleration time or reduce the load. Also consider increasing the motor
capacity.