Detailed description - ERV-08M timer relay (0.1 s - 100 h), Un: 12-230 V AC/DC

The ERV-08M timer relay is a universal time relay designed to control delayed power-on after applying supply voltage. It offers a wide time range of 0.1 seconds to 100 hours, universal power supply 12-230 V AC/DC, simple operation, and DIN rail mounting.

It is suitable for automation applications, controlling fans, motors, lighting, contactors, and other devices that require start-up delay.

Key features

• Function of delayed switching of NO contacts when voltage is applied

• Wide time range: 0.1 s - 100 h

• Universal power supply: 12-230 V AC/DC (4 VA)

• 1× SPDT changeover contact ( NO/NC), 5A/250VAC

• Two LED indicators:

  • ON (red) - power present

  • OUT (green) - output relay status

• Time setting using two rotary potentiometers

• Mounting on 35 mm DIN rail

• Protection IP20

• Compact dimensions: 91 × 18 × 65 mm

Controls and functions

LED indication

• ON (red) - relay is powered

• OUT (green, steady on) - output relay is powered (contact 2-3 connected)

• OUT (green, flashing) - countdown to switching is in progress

Time setting

The time relay allows for precise delay creation using two potentiometers:

1. Potentiometer "t" (0.1 to 10)
   - fine adjustment in % of the total range
   - 0.1 = 1%, 10 = 100%

2. Potentiometer "TS" - range selection:

   • A = 10 s

   • B = 100 s

   • C = 10 min

   • D = 100 min

   • E = 10 h

   • F = 100 h

The time change is activated the next time the power supply is connected.

Switching function

1) ON delay - delayed connection (terminals 2-3, NO)

• When power is connected , the set time countdown starts

• After the time has elapsed, the output relay (RLY ) is activated - contact 2-3 (NO → COM) is connected

2) OFF delay via NC contact (terminals 2-1)

• Contact 2-1 (NC ) is connected even without power

• When power is connected, the countdown starts

• After the time has elapsed, contacts 1-2 will open

Using

The ERV-08M timer relay is used for applications where a delayed power-on is required after an event occurs:

• The fan switches on only after the light comes on (toilet, bathroom)

• Lighting in the garage or hallway after door opening

• Gradual starting of motors

• Delayed switching of contactors

• Sequential switching of several circuits

• Delayed starting of appliances

The countdown starts when power is applied to the relay.