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4·6 Output signals when the Upper/Lower Limit Output Frequency is
reached.
When the upper/lower limit output frequency is set and the output frequency
has reached either limit, the corresponding open collector signal is activated.
These signals may be used for external sequencing of multiple units. The
-outputs (open collector) may be used with an internal (P24) or external power
source. A maximum of 40 ma total may be drawn from P24 for this purpose. A
low power relay option board is available for higher output ratings.
The outputs (open collector) are rated for 0.5 amps (maximum) at 24 VDC
(maximum) when used with an external power source. An interposing relay
may be utilized for larger loads.
CAUTION: The external power source voltage must not exceed the P24
supply voltage.
Fig.
4-6
shows the relation of the upper/lower limit with the signal output
(open collector.)
VTl30H
Output frequency
M ..
----------------)'1
/
,
/
I
/
UL
, ,
I
,
Operating frequency
I
,
I
LL
I
/
,
I
I
/
,
,
I
/
I
I
/
I
/
,
I
0
,
,
,
,
I
Frequency command
,
I
I
,
I
,
,
,
I
I
,
,
I
I
I
I
I
I
I
,
Upper limit
(ULl:
I
I
V
,
open collector
I
I
!
output
1
)
ON
J
i
I
Lower limit (LL):
,
I
,
open collector
•
I
,
I
,
output
!
l
I
ON
I
I
')
I
I
Fig.
4-6
Upper/Lower Output Frequency Limit and Output Signals
4-8
range
P24
UL
•
LL
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