Automatic HMI with Rotary Switch

1

Dip switch for rated frequency

The rated frequency as nominal value will become the reference for frequency threshold.

2

Dip switch for time delay at off position

• Time delay applied to the center-off position O when position I and position II are transferring, it stops at position O to protect inductive load.

• The delay is used for both process of transfer to N and A.

• The delay shall detect both sources, the stop condition will be either N recovered, or A source failed.

3

Dip switch for application

The application type can be selected as Utility to Utility or Utility to Genset.

4

Preferable source selection or priority source

SI and SII indicate the physical position of source. The normal and alternate power can be match to SI or SII according to requirement:

• When select SI as priority: SI becomes normal power while SII becomes alternate power.

• When select SII as priority: SII becomes normal power while SI becomes alternate power.

5

Dip switch for working mode

Two auto working mode can be selected:

• Auto-Auto return

• Auto-Non return

6

Rotary switch for rated voltage Ue

The rated voltage as nominal value will become the reference for voltage threshold.

2P (L-N) : 220 V, 230 V, 240 V, 250 V.

3P and 4P (L-L): 380 V, 400 V, 415 V, 440 V.

7

Rotary switch for threshold selection of voltage and frequency

Δf: The frequency deviation gap as reference of rated frequency.

ΔU: The voltage deviation gap as reference of rated voltage.

8

Rotary switch for transfer time delay from N–A

Δt: Transfer time delay between N–A. The unit is second.

9

Rotary switch for re-transfer time delay from A–N

Δt: Transfer time delay between A–N. The unit is minute.