Westinghouse 30-471 (E) Type Dial Setting Pickup Dropout, Undervoltage / Underfrequency Module

Instruction Leaflet

30-471 (E)

Page 8

Both under and overfrequency cards are factory calibrated at 60 Hz. The actual values of pickup and dropout are as follows:

Type		Dial Setting	Pickup	Dropout
		Hz	Hz	Hz
Underfrequency	60		57	55
Underfrequency	50		47	45
Overfrequency	60		63	65
Overfrequency	50		53	55
Undervoltage / Underfrequency Module
S#1288C58G01	Option# 5A, 26F
Monitors one phase of power source.

Time Delay Modules
1-60 sec. timer	S#1275C74G01	Option#1A, 3A, 4A
0.1-10 min. timer	S#1275C74G02	Option#1B, 3B, 4B
0.2-30 min. timer	S#1275C74G03	Option#1C, 3C, 4C
5 min fixed	S#1275C74G08	Option#4D

All can be used to accomplish TDEC, and TDNE functions.

Relay Driver

S#1266C77G02 Option#1A, 1B, 1C, 3A, 3B, 3C, 4A, 4B, 4C, 4D

This card is used in place of any of the timing modules when instantaneous operation is required.

Blank

S#1266C77G01

Used to cover any unused card slots.

All Cards Mechanically Interlocked

All cards are interlocked mechanically to prevent insertion into the wrong function slot. All cards have a repeat accuracy over a 20 to

+60°C temperature change of (+ or -) 3%. Dial settings are (+ or -) 10% of indication.

After making adjustments, tighten locking screw to secure setting. Tighten mounting screws (screws are not captive).