ABB HF Series - Page 18

18 ELECTRONIC COMPACT STARTER | MANUAL
Automatic restart
For applications in explosion-protection areas, automatic restart is not permitted!
• If the 'Automatic RESET' mode is used, the load is switched on again after the cooling time of 20 minutes has elapsed – if a
control signal is still present. In order to prevent this event, there is an option to use the manual RESET (via button or re-
mote acknowledgement point.
The following diagram shows an exemplary voltage characteristic for direct-on-line starters. Please note that this is a
simplified diagram.
—
09 Voltage characteristic of direct on-line starter
Diagram 1 – explanation:
• t
0
: Control voltage U
ON
> threshold 'high'→ motor starts
• t
3-4
: Voltage fluctuations → motor runs
• t
8
: Control voltage U
ON
< threshold 'low' → motor stops
• t
17
: Control voltage U
ON
> threshold 'high' → motor starts
• t
21
: Control voltage U
ON
< threshold 'low' → motor stops
• t
26
: Control voltage U
ON
> threshold 'high' → motor starts
—
t
0
—
t
8