455-461 Series
_
—
' a l
- - c a l +
,------)Ir
— F a i l
L h M a u t
0 Adjust
d 9 S e u i l
— e 0 Test
O I limit
Limit. I
1
, 1
Fuse fail
M I
06f. fusible
PLF
detection indication
PLF
detection setting
potentiometer
PLF
setting test
Internal Linear
current limit
potentiometer
Diagnostic
connector
Lock by
quarter-turn
Figure 4.5 Front fascia of a 461 series unit
4.5.6 Inhibition
Heatsink
Inhibition signifies that thyristor firing is not authorized irrespective of the input signal.
The inhibition input is available between terminal 16 and terminal 6 (0 V).
Inhibition is effective when a DC voltage between 4 V and 32 V is set on terminal 16 in
relation to terminal 6 (see fig. 4.3, page 4-12).
To ensure that the inhibition is not active, terminal 16 must not be connected or a DC voltage
between - 2 V and 1 V must be set.
4-18
451-461 User Manual
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