User manual

Publication 1760-UM001D-EN-P - September 2005

7-6 Retention

Impulse Relay

Task:

After a power failure, the lights in a stairwell should resume their

previous state.

Contacts and relays used:

Signal diagram:

U = Supply voltage

Range A: Q1 was on prior to losing power. When power is re-applied

and the T2 timer expires, Q1 turns back on.

Range B: Q1 was on prior to losing power. When power is re-applied,

switch I1 is on, so Q1 stays off. Use time T2 to avoid brief flicker.

Range C: M15 is switched on and remains set until the next time I1 is

activated.

Coil Function

T2 Enable after first cycle

I1 Push-button

Q1 Lamp output

M15 Impulse relay (retentive)

-----------TT2

I1--------

M15

M15-T2-----{Q1

00.10

TRG

RES

{T2

Circuit Diagram: Parameter Display:

M15

ABC