Agrowtek VX8i Manuale di istruzioni - Pagina 2

Sfoglia online o scarica il pdf Manuale di istruzioni per Controllore Agrowtek VX8i. Agrowtek VX8i 15. Digital irrigation valve controller

Introduction

GrowControl VX series digital interface modules connect Agrowtek's intelligent controllers to devices in your

growing environment.

VX8i and VX12i modules feature eight discrete DC FET ouputs for directly driving 15Vdc/24Vac irrigation

valves and other Dc devices. VX12i models also features four analog inputs. Analog inputs allow the connec-

tion of SXL optical liquid sensors and other third party analog sensors for integration. FET outputs connect

to DC signaled devices such as relays/contactors, solenoid valves, and to PWM driven devices such as motor

speed controllers or lighting dimming inputs.

Inputs (VX12i only)

Four analog inputs are provided for connection of of various analog 5Vdc third-party sensors, or discrete

sensors. Inputs are rated 0-5Vdc (or 0-20mA if current jumper is installed for the channel) and are 12 bit

(4096 steps.) Inputs may be used for discrete or analog type sensors. A 5Vdc 500mA power supply is includ-

ed on board for powering analog sensors or providing a signaling voltage for discrete or dry-contact sen-

sors.

Typical Discrete Sensors

SXL Optical Liquid Detection Sensors

Float Switches

Door/Window Switches

Flow Switches

Outputs

Eight heavy-duty transistor outputs with transient and yback protection are designed to connect to DC

contactor and relay coils for electrical panel control. Each transistor output is rated at 1A pilot duty (2A max

total per unit) and will switch the supplied voltage out to the terminals. Heavy duty FET transistors o er

robustness and reliability with ultra low heating.

Pulse Width Modulation (PWM)

The rst six (6) transistor outputs may be operated in a 1kHz square-wave PWM (pulse width modulation)

duty frquency between 10% and 90%. This allows integration with most lighting dimming controls and fan

speed controls.

Duty values below 10% will be output as 0%. Duty values above 90% will be output as 100%.

FREQUENCY

1kHz

Vin

OFF ON

Typical Analog Sensors

Moisture

Pressure

Temperature

Other

ON TIME

DUTY CYCLE % =

OFF TIME

x 100