7
Figure 5: Terminal Strip
3.2.1 Terminal Board Signal Description
Terminal blocks are TB1-TB4 from left to right, and Pin 1 is at the bottom of each terminal block.
TB1 Terminal Strip
TB1
Pin 1-Pin 3 ............. Earth connection (one for input power connection)
TB1
Pin 4-Pin 9 ............. Neutral power connection (one for input power connection)
TB1
Pin 10 .................... AC Mains live input
TB2 Terminal Strip
TB2
Pin 1 ...................... Form A contact closed when Pump B (base) is ON
TB2
Pin 2 ...................... Form A contact closed when Pump A (acid) is ON
TB2
Pin 3-4 ................... Form C contact activated, (if programmed) when pH is within programmed limits
(solenoid pump)
TB2
Pin 5-6 ................... Form C contact activated when Alarm Setpoint 2 exceeded (powered output contacts)
TB2
Pin 7-8 ................... Form C contact activated when Alarm Setpoint 1 exceeded (powered output contacts)
TB3 Terminal Strip
TB3
Pin 1-2 ................... Opto isolated input - low or short stops pumps (OFF on display)(Remote OFF)
TB3
Pin 3-4 ................... Opto isolated output - low when alarm condition exists
TB3
Pin 5-6 ................... Opto isolated output - pulse train to drive Pump A
TB3
Pin 7-8 ................... Opto isolated output - pulse train to drive Pump B
TB3
Pin 9-10 ................. Spare, not programmed
TB3
Pin 11-12 ............... Spare, not programmed
TB4 Terminal Strip
TB4
Pin 1-2 ................... Opto isolated input - flow switch input (add jumper if no flow switch is used)
TB4
Pin 3-4 ................... Opto isolated input - level switch input (add jumper if no level switch is used)
TB4
Pin 5-6 ................... Spare, not programmed
TB4
Pin 7-8 ................... Temperature input (from platinum RTD probe) (polarity sensitive)
TB4
Pin 9-10 ................. Power voltage source for preamp
TB4
Pin 11-12 ............... 4-20 mA output proportional to pH (programmable limits) (optional) (polarity sensitive)
Fuse #1
Fuse #2
See Detail A
Voltage Selection Switch
Neutral
GND
GND
GND
+ 5V
- 5V
NC
Output
PreAmp
Temp
4-20mA
Power
Input
1
2
3
4
5
6
7
8
9
10
11
Output
Pump B
Output
Pump A
Output
Fault
Flow
NO
NO
NO
NO
NC
NC
NO
Low Level
Remote
off
Alarm 1
Alarm 2
Solenoid
Live
120V/230V
7
8
1
2
3
4
5
6
2
3
4
5
Pump B
Pump A
6
7
8
9
10
11
12
1
1
2
3
5
6
7
8
9
4
10
12
Temp
Temp
TB1
TB3
TB4
TB2
Detail A
115V
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