26 • Technical Data
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Indication Description
Remarks
Terminal 19
External Fault #1 input
Input from a N.O. contact that is connected
between terminal 19 and a control input voltage
that is referred to terminal 21.
The HRVS-DN will trip 2 seconds after the contact
closes.
Terminal 20
External Fault #2 input
Same as terminal 19.
Terminal 21
Common to terminals 19
and 20.
This terminal is a reference for terminals 19 and 20.
Note:
When Control Supply and Control Input voltage to
the external faults input are from the same source,
connect a jumper between terminals 3 and 21.
Terminal 22
No connection (optional)
Standard RS485, half duplex with Modbus
protocol, baud rate 1200, 2400, 4800, 9600 BPS.
Terminal 23
RS-485 communication (-)
(optional)
Twisted shielded pair should be used.
Connect shield to ground on the PLC/Computer
side.
Terminal 24
RS-485 communication (+)
(optional)
Terminals 4 & 5 must be wired to Control Supply
for operation in communication mode (refer to
section
5.11 page 36 for wiring diagram).
Up 32 units can be connected for Modbus RS485
communication. For reliable communication, units
should be installed in the vicinity of 200m
maximum, from the first to the last unit.
Refer to section
7.8.8 page 75 for programming.
Refer to the Modbus communication manual
section
16 page 131.
Terminal 25
Programmable Insulation Alarm
Output relay (Common) (optional)
Voltage free 8A, 250VAC, 2000VA max. is
energized when the motor insulation level
decreases below the Insulation Alarm level.
Terminal 26
Programmable Insulation Alarm
Output relay (N.O.) (optional)
The relay is de-energized and the alarm will
disappear if one of the following occurs:
The insulation level returns to normal for more
than 60 seconds
HRVS-DN resets
Control Supply disconnection
Refer to section
7.8.6 on page 71 for more details
and programming.
Terminal 27
Programmable Insulation
Alarm Output relay (N.C.)
(optional)
Notes:
Insulation test can be performed only when main
voltage is not connected to the HRVS-DN,
(upstream isolation device must be opened.)
For correct operation of Insulation test, it is
important that the HRVS-DN is properly grounded
and that the Control Module is properly fastened
to the Power Section.
Insulation test option and analog output option
can not be applied together.
Terminal
Ground (optional)
Leave this terminal not connected. Ground the
shield of the analog output signal at the recipient
side.
Analog output (0-10VDC or 0-20mA or 4-20mA)
Terminal out(-)
Analog output (-) (optional)
reflects motor current and is related to 2xFLA. i.e.,
Full scale (10VDC or 20mA) is related to 2xFLA.
Or
reflects motor power and is related to Pn i.e., Full
scale (10VDC or 20mA) is related to motor rated
power. Motor rated power is set in the MAIN &
PROTECT parameter. Refer to section
7.8.2 page
55.
