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

The ERV-08M time relay is a universal delay-on relay designed to control delayed power-on activation. It features a wide time range from 0.1 s to 100 hours, a universal 12-230 V AC/DC power supply, easy operation, and DIN rail mounting.

It is suitable for automation applications, controlling fans, motors, lighting, contactors, and other devices requiring delayed activation.

Key Features

• Delay-on function when voltage is applied.

• Wide time range: 0.1 s to 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 is present

  • OUT (green) - output relay status

• Time setting with two rotary potentiometers

• Mounting on DIN rail 35 mm

• IP20 protection

• Compact dimensions: 91 × 18 × 65 mm

Controls and Functions

LED indication

• ON (red) - relay is powered

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

• OUT (green, flashing ) - counting down to switching

Time setting

The time relay allows setting a precise delay 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 hours

   • F = 100 hours

Time changes are activated upon the next power-on.

Switching Function

1) Delay-on function - delayed power-on (terminals 2-3, NO)

• When power is applied, the set time begins to count

• After the time expires, the output relay (RLY ) activates - contact 2-3 (NO → COM) engages

2) Delay-off via NC contact (terminals 2-1)

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

• When power is applied, the countdown begins

• After the time expires, contacts 1-2 open

Applications

The ERV-08M timer relay is used in situations where a delayed power-on is required after a certain event:

• Fan turns on only when the light is switched on (toilet, bathroom)

• Lighting in a garage or hallway after opening the door

• Gradual starting of motors

• Delayed activation of contactors

• Sequential activation of multiple circuits

• Delayed device activation

Timing begins when power is applied to the relay.