Mec Speed Level 2684 RT Service And Parts Manual page 69

M B
OMENTARY UTTON
• Disconnect wires.
• Connect one probe of ohm meter each terminal.
• With the button in the neutral (open) position there
should be no reading.
• With the button pushed (closed) there should be a low
resistance
E S
MERGENCY TOP
• Disconnect wires.
• Connect one probe of ohm meter each terminal.
• With the button PRESSED there should be no reading.
• With the button RESET there should be a low resistance.
R
ELAY
• 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 clos-
ing. Continuity with #30 will be made.
"3084 Speed Level™ Sigma Lift" Service and Parts Manual
S
WITCH
B
UTTON
C
O N T I N U I T Y
Figure 2-18: Button Switch, Momentary
ART_2565
Figure 2-19: Emergency Stop Switch
ART_2566
Figure 2-20: Relay Operation
RELAY DETAIL
(relay energized)
30
B−
87A
85
87
C
H E C K S
Common
Normally Open
Common
Normally Open
1
1A
B+
86
ART_2330
November 2009
Page 2-17