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@
-0
(5 (5 @
AM
CC
+
rf
-
Ammeter
Zero-adjust
screw
' V
Figure 4.7 Terminals to use for connecting an ammeter to the niverter
• When a voltmeter of 7.5Vdc rating is used, set the upper limit of its scale to a maximum of
2.5 times the inverter's rating.
• Calibrate the ammeter's scale by using a frequency above 40Hz, preventing from occuring an
incorrect value about the AM output voltage at low-frequency.
4.4 Fault-cletection signal terminals
When any of the inverter's system protection features are activated and the inverter trips(see list
of probable causes in Section 3.3.2 (page 31), the coded cause of the problem will be displayed
on the monitor display and a fault-detected signal will be output. The VF-A3 inverter's three
fault-detection terminals 8FLA, FLB, and FLC (see Figure 4.8 for their locations) are provided as a
relay contact output (250Vac, 2A).
~
fm----
~
-------1---
8
@
@
@
FLA
FLB
FLC
Figure 4.8 Fault-detection signal terminals.
4.5 Reset signal terminals
When the inverter trips due to an emergency stop or the activation of one or more of its protective
functions (refer to the list of status monitor codes given in Table 3.3 of Section 3.3.2 (page
31 )),
you must first correct the cause of the fault, and then reset the inverter.
You can reset either via the inverter's operating panel or 'ilia an external signal.
* When the trip retention function is set at zero (0), you can reset the inverter after switching power
off for at least 10 seconds (see Section 5.3.4 (page 95)) for details on the trip retention function).
* The inverter can not be reset till correcting the cause of the fault.
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