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GEH-2030
15. The end of the residual screw of the TX unit should be flush with the inside face of the armature.
To check the time calibration connect the Type RPM relay as shown in Figure 15. In testing the Type
RPM relays with a passing second zone contact the clock will be stopped only momentarily and the reading
must be made at that instant since the timing unit contacts are closed only 0.15 seconds. A fast operating
self-scaling auxiliary relay energized through the timing unit contacts may be used to stop the clock.
Set the pointers of the front and rear insulated cams so that the notched edge coincides with the
desired calibration marks on the scale. Check the time by closing 51. then read the time when the clock
stops momentarily. Note that 51 should be opened a.s soon as the intermittently relays have timed out.
If necessary. the time calibration may be corrected by sliding the copper cylinder forward or backward
on the magnetic damping element shaft or by turning the driving spring collet on its shaft.
Moving the copper cylinder forward decreases the time delay and moving it backward increases the time
delay. Never move the copper cylinder backward enough to strike the bottom plate of damping magnet element.
Turning the driving spring collet in a counter clockwise direction (front view) decreases the time
delay and in a clockwise direction increases the time delay.
RENEWAL PARTS
It is recommended that sufficient quantities of renewal parts be carried in stock to enable the prompt
replacement of any that are worn, broken or damaged.
When ordering renewal parts, address the nearest Sales Office of the General Electric Company. speci-
fying the quantity required and describing the parts by catalog numbers as shown in Renewal Parts Bulletin
No. GEF-3835.
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