Dwyer 2600 - Manual (Page 10)

CAUTION: DO NOT RUN SIGNAL WIRING IN THE SAME CONDUIT OR
CHASE AS THE POWER WIRING. ERRATIC OPERATION OR DAMAGE TO
THE CONTROL CIRCUITRY WILL RESULT.
WIRING FOR OPTION 948 4-STAGE SET POINT
SWITCH CONTACTS FOR OPTION 948 MUST BE ISOLATED AND CAN NOT
SHARE WIRING WITH OTHER CONTROLS.
TRANSISTOR DRIVE MUST BE ISOLATED AND MAY NOT SHARE A
COMMON GROUND WITH OTHER EQUIPMENT OR OTHER CONTROLS.
May, 2013 Page 10 of 52 949-1194 Rev. 7
5
4
3
2
1
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15
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13
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Option 948
C A B
Switch Truth Table for Option 948
A to C B to C Active Set Point
open open 1SP1
closed open 2SP1
open closed 3SP1
closed closed 4SP1
2
1
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12
11
C A B
Wiring for
Relay control
(Coil wiring
not shown)
Alternate
wiring for
Transistor
control.
Use NPN
open collector
transistors.
(Drive circuit
not shown)