YASKAWA T1000V - Page 107

5.2 b: Application
YASKAWA ELECTRIC SIEP C710606 44B YASKAWA AC Drive T1000V Technical Manual 107
Parameter Details
5
• Using Control Circuit Terminal A2 (0/4 to 20 mA current input)
Connect input A2 to an external current source such as the one shown in Figure 5.2. Make sure that switch S1 is set
to “I” and set the appropriate signal level for terminal A2 by entering 2 (4 to 20 mA) or 3 (0 to 20 mA) into parameter
H3-09. The terminal A2 function must be set to frequency bias by entering 0 into parameter H3-10 (Refer to H3-10:
Terminal A2 Function Selection on page 180).
Figure 5.2
Figure 5.2 Setting the Frequency Reference by Current Input
Switching between Main/Auxiliary Frequency References
The frequency reference input can be switched between terminal A1 (main) and terminal A2 (auxiliary). When using this
function:
• Make sure that b1-01 is set to “1” (Frequency reference from analog input terminal A1, A2).
• Set the terminal A2 function to auxiliary frequency (H3-10 = 2).
• Set one digital input to multi-speed 1 (H1- = 3, default for S5).
The frequency reference value is read from
• Terminal A1 when the digital input set for multi-speed 1 is open.
• Terminal A2 when the digital input set for multi-speed 1 is closed.
Figure 5.2 shows a wiring example for main/auxiliary reference switching using digital input S5.
Figure 5.3
Figure 5.3 Switching between Analog Reference 1 and 2
Setting 2: MEMOBUS/Modbus Communications
This setting requires that the frequency reference is entered via the RS-485/422 serial communications port (control
terminals R+, R-, S+, S-, Protocol: MEMOBUS/Modbus). For instructions, Refer to MEMOBUS/Modbus
Configuration on page 382.
Drive
A1
A2
Frequency reference
Frequency reference bias
AC
Analog common
+V (+10.5 V, 20 mA power supply)
0 or 4 to 20 mA input
DIP switch S1
VI