Hitachi L100 IP Series, Инструкция по эксплуатации

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Chapter 7 – Control circuit terminal functions
7-17
Terminals AL0, AL1, AL2 (alarm relay)
Terminal function
When a trip occurs the alarm relay (double throw switch) is activated. The user can choose which terminal is
to function as normally open and which as normally closed contact. A trip message is displayed on the digital
operator's display.
AL0 AL1 AL2
Configu-
red as
Power
supply
State AL0-AL1 AL0-AL2
ON Normal Closed Open
ON Trip Open Closed
OFF - Open Closed
AL0 AL1 AL2 AL0 AL1 AL2
Configu-
red as
Power
supply
State AL0-AL1 AL0-AL2
ON Normal Open Closed
ON Trip Closed Open
OFF - Open Closed
AL0 AL1 AL2
Normal operation:
Alarm or inverter
is switched off:
Normal operation or
inverter switched off
Trip condition:
Relay contacts electrical characteristics:
Operation with DC voltage:
5V/100mA min., 30V/3.0A max. (resistive) or 0.7A (cos phi = 0.4)
Operation with AC voltage: 100V/10mA min., 250V/2.5A max. (resistive) or 0.2A (cos phi = 0.4)
N.C.
contact
C 33
=01
N.O.
contact
C 33 =00
Configuration
C 33
Refer to the above table to configure the contacts AL0/AL1 and AL0/AL2 as normally closed or normally
open contacts using
C 33
.
Remarks
•
After a trip has occurred the trip message displayed is conserved even when the power to the inverter is
switched off. For this reason, this trip message can be displayed again when the inverter is switched on
afterwards. However, the inverter will be reset when it is switched off which means that the existence of a
trip message will not be indicated by the alarm relay contacts when the inverter is switched on again. If
the trip signalling must be kept even after the inverter has been switched on again, use external circuitry
to hold the alarm signal.
•
When the alarm relay output is configured as normally closed contact (i.e. no alarm signal when output is
closed, this is the factory default) it is important to remember that a time delay exists from the time the
input power is switched on until the alarm output is closed (deactivated) and thus a trip condition is
indicated for a short time after switching on the input power.