The following list summarizes the key points on relays.
l Relay K1 (FC1) is associated with CH7 only.
l Relay K2 (FC2) is associated with CH8 only.
l User load can be connected in either leg (or both legs) of the relay path provided polarity is
observed.
l Each relay contains a top mounted LED that illuminates green to indicate that the relay is in
the ON state (conducting). The LED is extinguished to indicate the relay is in the OFF state
(non-conducting).
l The IOTA relay connections are rated for 1.5 Adc, 60 Vdc maximum.
l The fuses in relays K1 and K2 are user replaceable (5 x 20 mm, 2.5A /250V, time lag).
l The relays K1 and K2 are electrically isolated from each other, from system power and ground
and from chassis (cabinet) ground.
l Relays K1 and K2 are replaceable by ordering Honeywell part number 51190516-134.
Figure 6.12 Fast Cutoff relay wiring diagram
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Chapter 6 - Series C PIM connectivity
Chapter 6 - Series C PIM connectivity
6.8 About enabling pulse proving in PIM
You must use Control Builder to select the stream to be proved (only one per PIM). This action
connects the good pulses from the selected stream to the Prover Pulse Bus. For each good pulse
from the selected stream, a 20 us wide positive going pulse is output on the PIM Prover Bus. The
tri-state output of the Prover Pulse Bus allows for multiple Series C Prover Pulse outputs to be
connected in parallel to a single ST102 (or other hardware) allowing for larger installations which
have more meter streams for a single meter prover.
Only channel pairs configured in dual configuration can provide a source of good pulses for prover
output.
Refer to the section Enabling pulse proving in Pulse Input Module for more information.
For proper operation of the Prover Pulse Bus, a resistor must be connected to TB4 as shown in the
following diagram.
