Syn-Tech Systems FuelMaster FMU-2500 Classic Installation Manual page 94

2) Using a Smart Relay Assembly. The Smart Relay Assembly (see Figure 4-17) is so named
because of its ability to be programmed to perform multiple functions not possible with
simple wiring workarounds. It has a Programmable Interface Controller (PIC) which may be
programmed to perform multiple functions. A Smart Relay Assembly may be added as a first
or second relay assembly in an FMU. A Smart Relay Assembly may control a maximum of
three devices. Where it has four relays, three relays are used for control and the fourth relay
is used to generate pulses. Each relay activation generates 10 pulses, which is translated to
one transaction.
Smart Relay Assemblies do not utilize the Pedestal I/O Board and FMU Auto/Manual
Switches when controlling devices. Control wires are wired direct into the Smart Relay
Assembly. Auto/manual switches specifically for use with the Smart Relay Assembly are
installed on the board.
Smart Relay Assemblies produce a momentary contact closure adjustable for 1 to 16
seconds through dip switches located on the board. The dip switches are numbered 1-4 and
provide the following momentary settings:
The J3 receptacle is fitted with a 7-pin terminal plug for control wiring inputs. Control wiring
to J3 is matched as follows: hose 1 = pins 2 and 3, hose 2 = pins 4 and 5, and hose 3 = pins
6 and 7. Use one pin of each pair to receive input, and the other to send an output. It doesn't
matter which is used for the input, or which is used for the output.
When a Smart Relay Assembly is installed, the Divide Rate for the applicable hose position
is set to 10:1, the Pump Finish Timer is to 10 seconds, and the No Pulse Timeout is set to 10
seconds.
The indicator lights L1, L2, and L3 illuminate when a signal is sent to the Smart Relay
Assembly. The light stays on until the relay turns off and the 10 second Pump Finish Timer
expires. The indicator lights K1, K2, and K3 illuminate when the corresponding relay is
activated, and stays on for the duration set by the dip switches. The indicator light K4
illuminates when the relay is generating pulses, and flashes until enough pulses are
generated to create a transaction.
Each Smart Relay Assembly can control up to a maximum of three devices. If more than one
device is being controlled, a jumper wire must be added for each additional pulser input. If
two devices are installed and connected to hose positions A and B, install a jumper between
pins 2 (P1) and 4 (P2) of J4. If three devices are installed and connected to hose positions
A, B, and C, install a jumper between pins 2 (P1) and 4 (P2) of J4, and another jumper
between pin 4 (P2) of J4, and pin 2 (P3) of J6. One pulse output from the Smart Relay
Assembly is used as a pulse input for three positions on the Pedestal I/O Board.
FuelMaster
®
All Off = 1 second
1 On = 4 seconds
1 and 2 On = 8 seconds
1, 2, and 3 On = 12 seconds
All On = 16 seconds
Installation Manual
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