B-2 Appendices
TP-5672 11/95
TB-DC1
Terminal
No.
Input/
Output*
TB-DC1
Terminal Name
TB-DC1
Terminal Description
18 OUTPUT Emergency Source If the emergency source is available, terminal 18 is grounded.
19 OUTPUT System Alert If there is a system-status system alert, terminal 19 is
grounded.
20 INPUT Automatic/Manual If terminal 20 is grounded, the logic board is in the manual
mode. The transfer switch is then under the control of the
manual transfer pushbuttons.
21 OUTPUT Engine Start Terminal 3 Connects to generator set engine start terminal 3.
22 OUTPUT Remote Start/Stop Relay Terminal 22 is connected to K2, normally closed contact.
23 OUTPUT Unregulated DC Power Terminal 23 is an output voltage source to the optional dry
contact kit, DD-14.
24 INPUT K1 Test Relay Control Grounding terminal 24 energizes the test relay which simulates
a normal source failure.
25 INPUT Normal Relay/
Emergency Relay/
Off-to-Normal Relay
Off-to-Emergency Relay
Terminal 25 supplies 10 volts DC to the transfer control relays.
The power is supplied from terminal 30.
26 OUTPUT Normal Source If the normal source is available, terminal 26 is grounded.
27 OUTPUT Emergency-Position
Relay
If the contactor is in the emergency position, terminal 27 is
grounded.
28 OUTPUT Normal-Position Relay If the contactor is in the normal position, terminal 28 is
grounded.
29 INPUT Battery Input for external 12 to 30 volt DC controller power supply.
30 OUTPUT Regulated DC Power
Supply
Regulated 10 volts DC from the controller power supply.
31 OUTPUT Engine Start Terminal 4 Connected to P1-15.
32 N/A Ground Ground
33 N/A Ground Ground
34 N/A Ground Ground
*Use Dry Contact Kit for external annunciation to custom equipment.
Figure B-1. Power supply board TB-DC1 terminal numbers, names,
and descriptions—continued