Delta Electronics VFD-E manual Example 8 Blinking Circuit

Appendix D How to Use PLC Function

The vibrating circuitry of cycle time ΔT(On)+ΔT(Off):

X0 Y1

TMR T0 Kn

T0 X0

Y1

Y1

nT T

The figure above uses timer T0 to control coil Y1 to be ON. After Y1 is ON, timer T0 will be closed at the next scan period and output Y1. The oscillating circuit will be shown as above. (n is the setting of timer and it is decimal number. T is the base of timer. (clock period))

Example 8: Blinking Circuit

X0	T2
		TMR	T1	Kn1	X0
T1		TMR	T2	Kn2			n2*T
X0	T1				Y1
		Y1				n1*T

The figure above is common used oscillating circuit for indication light blinks or buzzer alarms. It uses two timers to control On/OFF time of Y1 coil. If figure, n1 and n2 are timer setting of T1 and T2. T is the base of timer (clock period)

Example 9: Triggered Circuit

X0

M0 X0

M0	Y1
		Y1	M0
M0	Y1		Y1

T

In figure above, the rising-edge differential command of X0 will make coil M0 to have a single pulse of ΔT (a scan time). Y1 will be ON during this scan time. In the next scan time, coil M0 will be OFF, normally close M0 and normally close Y1 are all closed. However, coil Y1 will keep on being ON and it will make coil Y1 to be OFF once a rising-edge comes after input X0 and coil M0 is ON for a scan time. The timing chart is as shown above. This circuit usually executes alternate two actions with an input. From above timing: when input X0 is a square wave of a period T, output coil Y1 is square wave of a period 2T.

Revision June 2008, 04EE, SW--PW V1.11/CTL V2.11 D-17