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Chapter 4

Specifications

Typical for 25 °C unless otherwise specified.

Specifications in italic text are guaranteed by design.

Output specifications

Table 4-1. Output specifications

Number of relays 8

Relay configuration 2 banks of 4

Contact configuration

8 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

(controls relay power

on state)

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 4-2. 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) Comes with UCERB 08 9 V ±10% @ 1 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 750 mA typ, 850 mA max

External power consumption

All relays off, 100 mA downstream hub power 170 mA typ, 200 mA max

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