ProtEX-MAX PD8-6001 Explosion-Proof Feet & Inches Meter Instruction Manual
41
Application #2: Pump Alternation Using Relays 3 & 4
1. Relays 1 and 2 are set up for low and high alarm indication.
2. Relays 3 and 4 are set up for pump alternation.
Set and Reset Point Programming
Relay Set Point
Reset Point
Function
1
4
FT
10
IN
0
/
16
7
FT
6
IN
0
/
16
Controls low alarm
2
45
FT
0
IN
0
/
16
42
FT
0
IN
0
/
16
Controls high alarm
3
40
FT
0
IN
0
/
16
9
FT
0
IN
0
/
16
Controls backup pump
4
30
FT
0
IN
0
/
16
10
FT
0
IN
0
/
16
Controls main pump
The following graphics provide a visual representation of a typical pump alternation application with high
and low alarm monitoring:
1. Relay #4 turns the main pump on at 30
FT
and
turns it off at 10
FT
.
2. With the Pump Alternation feature activated,
the next time the level reaches 30
FT
, relay #3
transfers and starts the backup pump.
3. If the backup pump is not able to keep up,
and the level reaches 40
FT
, relay #4 transfers
and starts the main pump as well.
4. Relay #2 trips the High Level Alarm at 45
FT
and resets at 42
FT
.
5. Relay #1 trips the Low Level Alarm at 4
FT
10
IN
and resets at 7
FT
6
IN
.
FT
IN
-
-
16
30
FT
10
FT
FT
IN
-
-
16
30
FT
10
FT
FT
IN
-
-
16
40
FT
9
FT
FT
IN
-
-
16
45
FT
42
FT
FT
IN
-
-
16
7 6
FT IN
4 10
FT IN
