YDS

Capability of setting time for star start-up 50 milliseconds delay between star contactor closing and delta con- factor opening Having two separate Single-contact relays Having one signal: DELTA: To display delta status


Principles of Operation:

Stor-delia timer is designed to start up Squirel–Cage-Induction-Motors with star to delta Change-Over. When supply voltage is applied to terminals Al and A2. delta circuit tim- ing starts (internal contact of terminal 15 to 16 is mode). At the end of star time adjusted by DELAY potentiometer handle. star relay changes its status and delta relay will act (intemal contact of terminal 25 to 28 is made). This timer uses two separate timing circuits. one with variable time to control star contactor (adjustable by DELAY potentiometer handle) and the other with fixed 50-millisecond time to prevent the simultaneous operating of star and delta con- factors. This fime lag is to make sure star contactor s opened before proceeding delta contactor going to be closed. Timer will be ready for retiming about one second atter supply disconnection.

Technical Specifications:

Supply Voltage: 220 VAC + 10%

Network Frequency: 504 5 Hz

Internal Loss: About 3 W

Star Delay Time: 3 to 60 seconds adjustable by DELAY potentiometer handle

Delay between Star Opening and Delia Closing: 50 milliseconds

Output Relay: Two Single-C/O contact relays

Contact Curent: 6 A. 220 VAC- 6A. 28 VDC