Electrical Descriptions - IPS Controllers M920 Owner's Manual

M920 & M920W pH/Dual ORP Controller Owner's Manual
i. External audible/visible alarm (optional)
j. pH sensor - BNC connection
k. ORP sensor - BNC connection
l. Optional dry contact ORP1 output (contact factory for
instructions)
F. Electrical Descriptions
1. Power
a. 120 VAC, 50-60 Hz, 3-wire grounded NEMA 5 power cord. GFCI
source required. Note: TFor 240 VAC, a hardwire connection is
required. Use only 18AWG stranded copper wire. The con-
troller's power supply will automatically detect the incoming
power and will output the same power to your devices. All
output devices (feeders) must match incoming voltage.
2. Dip Switches (1-4)
1: pH/ORP interlock (default: OFF)
• No ORP1 or ORP2 feed if pH is feeding (ON).
2: pH/ORP alert interlock (default: ON)
• No ORP1 or ORP2 feed if pH is in alert mode (ON).
• No interlock (OFF)
3: Acid/Base default acid (default: OFF)
• Feed base chemical when pH level falls below set point. (ON)
• Feed acid chemical when pH above set point. (OFF)
4: Not in use.
Figure 3: Dipswitches
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