2-18
Chap. 2 MOUNTING AND WIRING THE INVERTER
Table 2.7 Symbols, Names and Functions of the Control Circuit Terminals (Continued)
Classifi-
cation
Symbol Name Functions
- Since low level analog signals are handled, these signals are especially susceptible to the external noise
effects. Route the wiring as short as possible (within 20 m) and use shielded wires. In principle, ground
the shielded sheath of wires; if effects of external inductive noises are considerable, connection to
terminal [11] may be effective. As shown in Figure 2.11, be sure to ground the single end of the shield
to enhance the shield effect.
- Use a twin-contact relay for low level signals if the relay is used in the control circuit. Do not connect
the relay's contact to terminal [11].
- When the inverter is connected to an external device outputting the analog signal, the external device
may malfunction due to electric noise generated by the inverter. If this happens, according to the
circumstances, connect a ferrite core (a toroidal core or equivalent) to the device outputting the analog
signal or connect a capacitor having the good cut-off characteristics for high frequency between control
signal wires as shown in Figure 2.12.
- Do not apply a voltage of +7.5 VDC or higher to terminal [C1]. Doing so could damage the internal
control circuit.
Figure 2.11 Connection of Shielded Wire Figure 2.12 Example of Electric Noise Reduction
[X1] Digital input 1
[X2] Digital input 2
[X3] Digital input 3
[X4] Digital input 4
[X5] Digital input 5
[X6] Digital input 6
[X7] Digital input 7
[FWD]
Run forward
command
Digital input
[REV]
Run reverse
command
(1) Various signals such as "Coast to a stop," "Enable external alarm trip," and "Select
multi-frequency" can be assigned to terminals [X1] to [X7], [FWD] and [REV] by
setting function codes E01 to E07, E98, and E99. For details, refer to Chapter 5,
Section 5.2 "Details of Function Codes."
(2) Input mode, i.e. SINK/SOURCE, is changeable by using the slide switch SW1.
(Refer to Section 2.3.6, "Setting up the slide switches.") The factory default for
FRN_ _ _G1
-2A/4A is SINK, and for FRN_ _ _G1
-4E, SOURCE.
(3) Switches the logic value (1/0) for ON/OFF of the terminals [X1] to [X7], [FWD], or
[REV]. If the logic value for ON of the terminal [X1] is 1 in the normal logic system,
for example, OFF is 1 in the negative logic system and vice versa.
(4) Digital input terminal [X7] can be defined as a pulse train input terminal with the
function codes.
Maximum wiring length 20 m
Maximum input pulse 30 kHz: When connected to a pulse generator with open
collector transistor output
(Needs a pull-up or pull-down resistor. See notes on
page 2-20.)
100 kHz: When connected to a pulse generator with
complementary transistor output
For the settings of the function codes, refer to FRENIC-MEGA User's Manual,
Chapter 5 "FUNCTION CODES."
(Digital input circuit specifications)
Figure 2.13 Digital Input Circuit
Item Min. Max.
ON level 0 V 2 V
Operating voltage
(SINK)
OFF level 22 V 27 V
ON level 22 V 27 V
Operating voltage
(SOURCE)
OFF level 0 V 2 V
Operating current at ON
(Input voltage is at 0 V)
2.5 mA 5 mA
(For [X7]) (9.7 mA) (16 mA)
Allowable leakage current at
OFF
− 0.5 mA
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