RKI Instruments Pioneer 4W - Manual (Page 10)

6 • Description Pioneer Gas Monitor Operator’s Manual
External wiring terminal strips
Two external wiring terminal strips are below the AC terminal strip and to the left of the
relays. Each 12-point terminal strip includes a lower (terminals 1 through 6) and upper
(terminals 7 through 12) row of terminals. The external wiring terminal strips are labeled
TB2 and TB3 on the main circuit board. Table 2-1 lists the function of the external wiring
terminal strips.
Expansion terminal strip
The 3-point expansion terminal strip is below and between the third and fourth analyzer
card sockets (near the bottom right corner of the main circuit board). You can network up
to four Pioneers together by using the expansion terminal strip. The expansion terminal
strip is labeled
TB4 on the main circuit board.
Relays
NOTE: Each analyzer card also includes alarm 3, alarm 2, and alarm 1 relays that are
dedicated to the channel that the analyzer card is plugged into.
Four relays are to the right of the external wiring terminal strips. The relays are single-
pole, double-throw (SPDT) and are rated for 8 amps at 250 VAC (resistive). The relays are
from top to bottom alarm 3, alarm 2, alarm 1, and fail. The relays are common for all
channels. For example, the alarm 1 relay energizes when
any active channel goes into an
alarm 1 condition.
NOTE: You can select normally energized or normally de-energized relays in the
Instrument Setup program. This section describes the default setting: normally
de-energized. The fail relay is factory-set as normally energized and is not
user-selectable.
Table 2-1: Terminal Assignments for the External Wiring Terminal Strips
Terminal Number Wire to:
TB3 1 Not currently used
2, 3 RS-485 connection to a personal computer (PC)
4 Shield
5, 6 RS-232 connection to a PC
7 - 9 External alarm for common alarm 3 relay
10 - 12 External alarm for common alarm 2 relay
TB2 1, 2 DC power source (You can use DC power as a primary
or backup power source.)
3, 4 The buzzer (factory-wired)
5, 6 The reset switch (factory-wired)
7 - 9 External alarm for common alarm 1 relay
10 - 12 External alarm for common fail relay