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Motor Control ch 5

Control Transformers

QuestionAnswer
1. When the terminals on a control transformer have to be linked by wire, the __- wire types and sizes should be used. manufactured/ recommended
2. To step down from 480V Ac to 120 V AC, the primary windings are connected in ___ and the secondary windings are connected in ___. series, parallel
3. Control trasformers are rated in ___. VA
4. Generally, control transformers step down the main line voltage to a control voltage of ___ or ___VAC 120, 24
5. The wiring terminals of a control transformer are connected together with a metal clip to minimize the ___ voltage drop across the connection
6. List three factors which determine proper transformer size requirements. total steady state, total in rush, in rush load power factor.
7. The NEMA standard specifies that AC magnetic motor starting devices must function at voltages as low as ___ % of the rated coil voltage. 85%
8. Control transformers generally have overcurrent protection provided by ___ or ___. fuses or breakers
9. List three common installation configuration options for control transformer fuse blocks fuse clips, panel mounted fuse holders, DIN rail mounted fuse holders p77
10. Some industrial applications require fuse protection on one ___ line and in both ___ lines. secondary, primary
11.The use of fuses on the primary and secondary side of a control transformer is specified by the ___ NEC
12. AC circuits of ___ V or more must be grounded in accordance with the National Electrical Code (NEV) Section 250. 50
13. Control transformer suppliers recommend fuse sized based on the ___ NEC
14. The ___(grounded/floating) system is the most common for industrial control applications. grounded
15. Voltage measurements should be made in the ___ condition and the ___ condition. no load, full load
16. List the two methods to troubleshoot control transformer failures. measure input output, measure winding resistence
17 Complete the wiring diagrams p 17
Created by: JoshHampton
 

 



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