Fuji Electric FRENIC-HVAC User Manual page 53

Symbol Name
Enable input 1
[EN1]
Enable input 2
[EN2]
[PLC] Power for
programmable
logic controller
signals
Digital input
[CM]
common
 Using a relay contact to turn [X1] to [X7], [FWD] or [REV] ON or OFF
Figure 2.6 shows two examples of a circuit that uses a relay contact to turn control
signal input [X1] to [X7], [FWD], or [REV] ON or OFF. In circuit (a), the slide
switch SW1 is turned to SINK, whereas in circuit (b) it is turned to SOURCE.
Note: To configure this kind of circuit, use a highly reliable relay.
(Recommended product: Fuji control relay Model HH54PW.)
<Control circuit>
[PLC] SINK
SOURCE
[X1] to [X7],
[FWD], [REV]
[CM]
(a) With the switch turned to SINK
Figure 2.6 Circuit Configuration Using a Relay Contact
(1) Opening terminals [EN1] and [PLC] or terminals [EN2] and
[PLC] stops the inverter's output transistor. (Safe Torque Off,
STO)
(2) These terminals are exclusively used for the SOURCE mode
input and cannot be switched to the SINK mode input.
(3) If input to either one of [EN1] and [EN2] is OFF, the inverter
issues an alarm (ECF). If the duration exceeds 50 ms, it is
regarded as mismatch. This alarm can be reset only by
restarting the inverter.
(Digital input circuit specifications)
<Control circuit>
+24 VDC
PLC
Photocoupler
EN1
6.3kΩ
EN2
6.3kΩ
CM
Figure 2.5 Digital Input Circuit (b)
(1) Connects to PLC output signal power supply.
Rated voltage: +24 VDC (Allowable range: +22 to +27
VDC), Maximum 200 mA DC
(2) This terminal also supplies a power to the load connected to
the transistor output terminals [Y1] and [Y2]. Refer to
"Transistor output" described later in this table for more.
Two common terminals for digital input signals
These terminals are electrically isolated from the terminals [11]s
and [CMY].
Photocoupler
2-20
Functions
Item
ON level 22 V
Operating
voltage
OFF level 0 V
Operating current at
ON
2.5 mA 5 mA
(Input voltage is
at 27 V)
Allowable leakage
current at OFF
<Control circuit>
SINK
[PLC]
SOURCE
[X1] to [X7],
Photocoupler
[FWD], [REV]
[CM]
(b) With the switch turned to SOURCE
Min. Max.
27 V
2 V
− 0.5 mA