Magnetrol Echotel 910 Installation And Operating Manual - page 7
51-604 Echotel Model 910
5
2.5.2 Relay
Model 910 switches have a number of possible relay
wiring options. The table below lists the relay contact
positions for all possible combinations of power failure,
condition of the transducer gap, and fail-safe jumper
position. The user must decide which combinations
constitute fail-safe and alarm conditions, and then select
the appropriate relay wiring and fail-safe position.
1. Run relay output wiring to the terminal blocks labeled
TB2 and TB3. Ensure that the load to be controlled is
within the relay’s rated capacity as shown in Section 3.3.2,
Electrical on page 6.
2. Select high or low fail-safe using the P1 jumper.
3. Replace housing cover. Installation is complete.
Caution: Never tighten unit to the tank connection by turning the
housing. Use a wrench on the transducer mounting nut
flats. Use thread tape or suitable pipe compound on
threads. Do not over tighten.
P1 Fail-safe
Line
Transducer
Relay Terminals
Jumper Position
Power
Gap
CM to NC
CM to NO
On
Dry
Closed
Open
Low level
Wet
Open
Closed
Failure
Dry
Closed
Open
Wet
Closed
Open
On
Dry
Open
Closed
High level
Wet
Closed
Open
Failure
Dry
Closed
Open
Wet
Closed
Open
Relay Output Wiring
P1 Fail-safe Jumper
P1
P1
LL HL