Instruction manual

2-20
Table 2.7 Symbols, Names and Functions of the Control Circuit Terminals (Continued)
Classifi-
cation
Symbol
Name
Functions
Digital input
- 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 66 ft (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
(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 4, Section 4.2
"Details of Function Codes."
(2) Input mode, i.e. SINK/SOURCE, is changeable by using the slide switch SW1. (Refer to
Instruction manual section 2.3.6 "Setting up the slide switches.")
(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/66 ft
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
2-22.)
100 kHz: When connected to a pulse generator with complementary
transistor output
For the settings of the function codes, refer to Chapter 4 "FUNCTION CODES."
(Digital input circuit specifications)
Figure 2.13 Digital Input Circuit
[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
[REV]
Run reverse
command
Item
Min.
Max.
Operating
voltage
(SINK)
ON level
0 V
2 V
OFF level
22 V
27 V
Operating
voltage
(SOURCE)
ON level
22 V
27 V
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