5 output terminal selection [01 b, 5 output terminal selection, O t b – Toshiba VF-SX User Manual
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10-6
TOSHIBA
10.5 Output Terminal Selection [01 b]
The function of the "frequency reached" signal output terminals RCH (UL) and
LOW (LL) can be selected as Indicated In Table 10-6 below.
TABLE 10-6: OUTPUT TERMINAL SELECTION OPTIONS
[ 0 b b ]
Value
Function
0
LL, UL (lower llmit/upper limit frequency signal)
1
LOW, UL (low speed signal and upper limit frequency
signal)
9
LL, RCH (lower limit frequency and speed reached signal)
3
LOW, RCH (low speed signal and speed reached signal)
When the assigned frequency Is reached during operation, the reached signal Is
enabled at the output terminal RCH (UL) and LOW (LL). The output signal Is an
"open collector output" (24 VDC, 50 mADC, maximum). The control side receives
the signals from a relay, programmable controller with 24 VDC Input, or similar
Input device.
The "speed reached< signal connection" example using a relay Is shown In Figure
10.1. The "speed reached signal connection" example using a programmable
controller Is shown In Figure 10.2. Toshiba strongly recommends the use of a
surge absorption device (SA) around the coll of external output relays.
Figure 10.1 Example of a
Speed-Reached Signal with
External Relay
PLC Controller
Figure 10.2 Example of a
Speed-Reached Signal with a
Programmable Logic Controller
The "speed reached" signal does not have a hysteresis so the reached
signal may cycle ON and OFF If the output frequency fluctuates near the
reached frequency. In this case adjust the speed reached detection with
the
[ i ~ f ~ C H ]
function. See Section 10.7.2 In this chapter.