Hitachi SH1-900H

2-23
Chapter 2
Installation and Wiring
■Serial communication
(Wiring example)
■24V power supply input/output
(Wiring example)
• SP and SN with the same name are internally connected, which are
available for a plurality of wiring.
• For the use of Modbus communication, contact to your supplier or
local Hitachi sales station.
Terminal
label
Terminal name
Description
Electric characteristics
RS485 communication
Serial communication
SP
SN
RP
(CM1)
MODBUS
terminal
(RS-485)
SP terminal: RS-485 differential(+) signal
SN terminal: RS-485 differential(-) signal
RP terminal: Connect to SP through a termination
resistor
CM1 terminal: Connect to the signal ground of
external communication devices.
There are two SP terminals and they are connected
internally for daisy chain connection. The SN
terminals connection is same as the SP terminals too.
The maximum baud rate is 115.2kbps.
Termination resistor (120Ω) integrated
Enabled: RP-SN shorted
Disabled: RP-SN opened
Terminal
label
Terminal name
Description
Electric characteristics
24V power supply
Input/Output
P24
24VDC output
power supply
terminal
This terminal supplies 24 VDC power for contact signals.
Max. output 100 mA
P+
External 24 VDC
power supply
input (24 VDC)
Input external 24 VDC power supply to the inverter.
24 VDC power supply input permits to change
parameter settings and perform optional
communication operations without control power
supply.
Allowable input voltage
24VDC±10%
Max. allowable current 1A
P-
External 24 VDC
power supply
input (0 VDC)
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
external devices,
Connect CM1
Into the SG (signal ground) of
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP and SN.
For enabling the termination
resistor, short-circuit between
RP
SN
SP
SN
SP
CM1
Modbus communication
(+) (-)
Control circuit terminal
Power supply
24V terminal
External 24V
terminal
P+
P24
P-
External DC24V power supply
Control circuit terminal
• If connecting 24 VDC external power supply into the terminal
P+ and P-, it is able to change parameters, perform optional
communication, digital/analog input/output and running
EzSQ without the main power supply.
When using the external 24 VDC power supply from P + and
P-, be careful not to shut off the power supply while
operating the inverter, such as changing parameters or
operating other functions. In particular, please note that if
the external 24 VDC is cut off during storage processing to
the internal memory such as data read/write function of the
keypad, writing to the holding register by Modbus
communication and/or etc.
It may cause the memory error.