DC-AS Converter for vibrators

A special-purpose dc-to-as current converter ISP-18/33 (ISP-11) is basically a free-convection-cooling microprocessor device, designed for control of a special three-phase asynchronous electrical motor of a vibrator EV-401 or EV-401-1, powered from the vehicle 24V (27V) electrical system

The converter is used for conversion of the 24V (27V) direct current voltage from a vehicle battery to alternative 3-phase 18V, 50Hz voltage.

PARAMETERS	PARAMETERS VALUE
Input parameters
Design voltage, V	27 (+10% -20%)
Current type	Dc
Design current, Inom, А	35,0
Maximum momentary current, Imax, А	50,0
Output parameters
Design voltage, V	18
Design current frequency, Hz	50
Number of phases	3
Design current, Inom, А	33,0
Maximum momentary current, Imax, А	45,0
Mode of operation according to GOST 12.2.013.0-91	15 min/20 min*
Protection rating according to GOST14254-96	IP54
Protection class according to GOST 12.2.007.0-75	III
Weight, kg, not exceeding	0.9

* 15 minutes – length of design operational period; 20 minutes – period of design off-interval.

The ISP converter provides emergency shutoff when the following is actuated:

 protection from input undervoltage;

 vibrator short-circuit protection;

 the motor time-current protection;

 earth leakage protection (tested before switching on);

 thermal protection (response level 70^oС).