Fluid Components International FLT93 Nuclear - Manual (Page 16)

INSTALLATION FLT ® Series FlexSwitch TM
16 Fluid Components International LLC
relay board is in the same enclosure as the control circuit. Both boards are mounted on the same panel and have been wired together at the
factory. This confi guration can be ordered without an enclosure which can be supplied by the customer.
The alarm connections are made at the auxiliary relay board where each alarm is driving a DPDT relay.
Caution: Do not connect any loads to the control circuit socket. Damage will occur to the control circuit if the alarm circuit is
energized.
Be sure the correct relay board has been ordered for the correct output. See the following paragraph.
This confi guration uses a control circuit that provides a switching voltage signal instead of relay contacts. The switch voltage is wired from
the control circuit socket to the auxiliary relay board actuating the relays.
The auxiliary relay board has several relay options that can be ordered. The options are as follows:
• Dry to 2 amps at 115 Vac or 28Vdc, Dry to 1 amp at 230 Vac (relay is enclosed in a plastic sealed cover).
• 100mA to 10mA at 115 Vac or 28Vdc, 50mA to 3 amps at 230 Vac (relay is enclosed in a plastic sealed cover).
• Dry to 0.5 amps at 115 Vac, hermetically sealed relay.
Make sure that the proper relays have been selected for the intended load. See Appendix A for the auxiliary relay board confi guration
drawing.
When connecting the relay wiring, do so with complete understanding of what the process requires of the instrument. The instrument has
dual DPDT or single 4PDT relay output contacts dependent on the jumper confi guration for each alarm switch point. For the relay logic, refer
to Figure 2-5. Also refer to Table 3-5 and Table 3-6 in Chapter 3 - Operation. Relay contacts are shown with the relays de-energized. Wire in
accordance with the system requirements.
The control circuit can be ordered with switching voltage outputs without ordering a relay board. This can be used with customer supplied
relays or any other device that has a differential input. The output voltage is 17 Vdc and will drive a load as low as 1500 ohms. Refer to
Figure 2-7 for the output terminals.
Wiring A Remote Control Circuit To An Auxiliary Relay Board
1. Run a four-conductor cable from the control circuit to the auxiliary relay board if the board was not factory installed. Use the wiring
diagram in Figure 2-7 to wire the boards together.
2. Attach the customer wiring as desired using Figure 2-7 as a wiring guide.
Wiring for this confi guration is the same as the sensing element wiring to the control circuit on a remote instrument.
Figure 2-6 Remote Wiring Diagram