Measurement-computing USB-ERB24 Manual de usuario descargar pdf (Pagina 20)

Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Output specifications

Table 1. Output specifications

Number of relays 24

Relay configuration 2 banks of 8 and 2 banks of 4

Contact configuration

24 Form C (SPDT) Normally Open, Normally Closed and Common available at

screw terminals

Contact rating 6 A @ 240 VAC or 28 VDC resistive

Contact resistance 100 milliohms max (initial value)

Operate time 10 milliseconds max

Release time 5 milliseconds max

Vibration 10 to 55 Hz (amplitude 1.5 mm)

Shock 10 G (11 milliseconds)

Dielectric isolation (between

relay open contact)

300 VAC, 50/60 Hz (1 minute)

Dielectric isolation (between

PCB output lines)

500VAC, 50/60 Hz (1 minute)

Life expectancy 10 million mechanical operations, min

S2 = pull-up Energized. NO in contact with Common Power on state

S2 = pull-down Not energized. NC in contact to Common

Relay control logic polarity

User-configurable per bank via switch S1 for invert or non-invert (default). Switch

settings for polarity can be read back via software through the USB bus. Switch

settings do not affect the power on condition. Non-invert mode, when "0" is written or

read back via the USB bus, relays are not energized. Invert mode, when "0" is written

or read back via the USB bus, relays are energized.

Pull-up / pull-down User-configurable per bank via switch S2 for pull-down (default) or pull-up.

Switch settings can be read back via software.

 Pull-down will put the relays in non-energized mode on power up.

 Pull-up will put the relays in energized mode on power up.

Power

Table 2. Power specifications

Parameter Conditions Specification

USB +5 V input voltage range 4.75 V min. to

5.25 V max.

USB +5 V supply current All modes of operation 10 mA max

External power supply (required) MCC p/n CB-PWR-9V3A 9 V ±10% @ 3 A

ext

< 6.0 V

ext

> 12.5 V PWR LED = Off (power fault)

Voltage supervisor limits - PWR

LED

6.0 V < V

ext

< 12.5 V PWR LED = On

All relays on, 100 mA downstream hub power 1.5 A typ, 1.8 A max External power consumption

All relays off, 100 mA downstream hub power 230 mA typ, 270 mA max

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Measurement-computing USB-ERB24 Manual de usuario Pagina 20

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