8
Z0X-2 Series Z-tron III
TM
Point Level Control
2.5 Relay Wiring
Refer to Figure 2-8 for the relay contact wiring. The Z-tron
III relay has double-pole, double-throw (DPDT) dry contacts.
The relay serves as a switch and does not provide the power
to operate an annunciator or other equipment. All relay
connections are made to the terminal strip on the electronic
unit.
N.C. =
Normally Closed
N.O. =
Normally Open
Figure 2-8
Wiring the Relays
LED ON
HIGH LEVEL
FAIL-SAFE
LED ON
TANK EMPTY
HIGH LEVEL
FAIL-SAFE
LED OFF
(ALARM)
TANK FULL
LOW LEVEL
FAIL-SAFE
LED OFF
(ALARM)
(NORMAL)
(NORMAL)
(NORMAL)
TANK EMPTY
LOW LEVEL
FAIL-SAFE
TANK FULL
1 2 3 4 5 6 7 8 9
HIGH LEVEL
FAIL-SAFE
1 2 3 4 5 6 7 8 9
HIGH LEVEL
FAIL-SAFE
1 2 3 4 5 6 7 8 9
LOW LEVEL
FAIL-SAFE
1 2 3 4 5 6 7 8 9
LOW LEVEL
FAIL-SAFE
Level Below Sensing Element
Level Above Sensing Element
Level Below Sensing Element
Level Above Sensing Element
Switch 1 RIGHT
= High Level Fail Safe
Switch 1 LEFT
= Low Level Fail Safe
Switch 1 LEFT
= Low Level Fail Safe
1
2
S
S
S
S
S
S
S
S
ON
Switch 1 RIGHT
= High Level Fail Safe
1
2
ON
1
2
ON
1
2
ON
