Table of Contents
Relay/Transformer (R/T Box)
Standard Transition R/T Box Schematic
20
21
22
XN2
XN1
24V
10V
10V
11V
CCN
Delayed Transition R/T Box Schematic
21
20
XN1
XN2
24V
10V
11V
10V
CCEO
CCN
GE Zenith Controls
30
XE1
24V
10V
11V
CCE
22
30
XE1
24V
10V
11V
CCNO
CCE
(cont'd)
31
XN1 - SOURCE 1 CONTROL TRANSFORMER
XN2 - SOURCE 1 3 PHASE SENSING TRANSFORMER
XE1 - SOURCE 2 CONTROL TRANSFORMER
SOURCE 2 24V OUTPUT
900
(18)
800
SOURCE 1 24V OUTPUT
(BLANK)
(BLANK)
(BLANK)
GROUND
GND
901
CCE - COIL CONTROL RELAY (SOURCE 2)
801
CCN - COIL CONTROL RELAY (SOURCE 1)
COMMON
902
903
SINGLE PHASE SOURCE 2 SENSING
904
803
804
3-PHASE SOURCE 1 SENSING
807
806
SOURCE 1 CONTROL POWER
805
906
SOURCE 2 CONTROL POWER
905
(1)
J5
31
XN1 - SOURCE1 CONTROL TRANSFORMER
XN2 - SOURCE1 3 PHASE SENSING TRANSFORMER
XE1 - SOURCE 2 CONTROL TRANSFORMER
900
SOURCE 2 24V OUTPUT
(18)
800
SOURCE 1 24V OUTPUT
(BLANK)
808
CCEO - COIL CONTROL RELAY (OPEN SOURCE 2)
908
CCNO - COIL CONTROL RELAY (OPEN SOURCE 1)
GND
GROUND
901
CCE - COIL CONTROL RELAY (SOURCE 2)
801
CCN - COIL CONTROL RELAY (SOURCE 1)
902
COMMON
903
SINGLE PHASE SOURCE 2 SENSING
904
803
804
3-PHASE SOURCE 1 SENSING
807
806
SOURCE 1 CONTROL POWER
805
906
SOURCE 2 CONTROL POWER
905
(1)
J5
23
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