"3072RT / 3772RT / 3772RT HD" Service & Parts Manual - ANSI Specifications
March 2008
Page 2-11
CONTINUITY CHECKS
Check Toggle Switch:
•
Disconnect wires and connect one probe of ohm meter to the connection on toggle switch
and other probe on other connection.
•
When toggle is open, there should be no reading, and when closed there should be a low
reading.
Check Selector Switch
•
Disconnect wires and connect one probe to common of switch and the other to normally
open terminal.
•
With the switch flipped, there should be a low resistance.
Check Emergency Stop Button
•
Disconnect wires and connect one probe of ohm meter to connection on button and other
probe on other connection.
•
There should be no reading with the button pressed and a low resistance with it reset.
Check Relay Operation (refer to illustration)
•
With the #85 terminal grounded, apply voltage to
#86 terminal connection.
•
Confirm normally closed (#87A) contacts are
opening. Continuity with #30 will be broken.
•
Confirm normally open (#87) contacts are closing.
Continuity with #30 will be made.
Check Limit Switch Operation (refer to illustration)
•
Loosen cover screw and lift cover from switch.
•
Mark and disconnect wires.
•
With one probe of ohm meter to “A” and other probe to “B”, release the plunger.
- Low resistance should be seen. Same result should be seen between “C” and “D”.
•
With one probe of ohm meter to “A” and other probe to “B”, depress the plunger.
- High resistance should be seen. Same result should be seen between “C” and “D”.
•
“E” and “F” should
show opposite results
as seen on previous
tests though there may
not be any circuits on
these terminals.
ART_2330
RELAY DETAIL
(relay energized)
8
5
8
6
8
7
8
7A
3
0
OPEN
CLOSED
B+
B−
ART_2331
A
B
C
D
E
F
A
B
C
D
E
F
A - B CLOSED
C - D CLOSED
E - F OPEN
A - B OPEN
C - D OPEN
E - F CLOSED
SWITCH RELEASED
SWITCH DEPRESSED
NO
NC
NC
NO
NC
NC
Cover
Pl
u
nger
Cover
S
crew
Summary of Contents for 3072RT
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