Yaskawa P7B Drive Bypass - Manual (Page 50)

Electrical Installation 2 - 12
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Drive Speed Control Circuit Wiring
The auto mode speed reference (speed command) field wiring connection is made directly to Drive terminals A2 (signal
positive), AC (signal common) and G (shield). Keep this lead length as short as possible to maintain signal quality. Insulated
twisted shielded pair wire (2 conductor # 18 ga, Belden 8760 or equivalent) is required. Do not run these wires in the same
conduits as other AC power or control wires. The shield must be connected on this end only, stub and isolate the other end. The
signal employed is 4 to 20 mA with parameter H3-08 set for “2: 4 - 20 mA”. For 0 to 10 VDC, parameter H3-08 is set for
“0: 0 - 10 VDC” and the P7 control board DIP switch S1-2 must be in the OFF position. (See Figure 2.11)
For remote operation, keep the length of the control wiring to 50 m or less. Separate the control wiring from high-power lines
(input power, motor leads or relay sequence circuits) to reduce induction from peripheral devices.
When setting speed commands from an external speed potentiometer (and not from a Digital Operator), use shielded twisted-
pair wires and ground the shield to terminal E(G), as shown in Figure 2.8. Terminal numbers and wire sizes are shown in
Table 2.5.
Fig 2.8 Analog Input Terminal Configuration on Drive
External
frequency
reference
0 to +10 V
Shield terminal
Speed setting power supply, +15 V 20 mA
Master speed reference, 0 to +10 V (20 k Ω )
Master speed reference, 4 to 20 mA (250
Ω
)/0 to +10 V (20 k
Ω
)
E (G)
P = Wire Pair