Standby Circuit - HNC Electric HV590 Series User Manual

and public terminal of external controller together.If you use an external power supply,jumper J9
must be removed,and connect external negative power supply to SP ,while positive power
supply to DI port.
3） Digital output terminal
When drive relay is essencial for digital output terminal,you should add absorption diode to
both sides of relay coil.Or +24V dc power supply will be easily damaged.
Caution： The polarity of the absorption diode must be installed correctly according to the
picture below.Or +24V dc power supply will immediately get burnt after digital output terminal
outputs.

2.7 Standby circuit

Inverter fault or jump may cause great breakdown loss or other accident. To avoid this
happens, please add the standby circuit below to ensure security.
Note：Confirm and test the running characteristic of the standby circuit, make sure that the
industrial phase and the converter phase are in the same direction.
R
S
T
3-phase AC power supply
Section II. Installation &Wiring
+24V
HV590
DO
COM
Fig. 2-6.5 Digtal output terminal wiring diagram
R
S
T
Fig. 2-7.1
Relay
Diode
U
V
Inverter
W
Interlock AC contactor
23
MCC1
M
3~
MCC2