Controls – ADS Environmental Services Spider QR 775010 A0 User Manual
Page 27
ADS Environmental Services ADS Spider User Manual
Page 25
Controls
Controls are connected to terminals marked CN1 to CN8.
Each control provides normally open relay contacts rated to 30 volts,
1 amp resistive loads. External protection diodes must be
installed when driving inductive loads, such as power relays.
A good general-purpose protection diode, also referred to as a
flyback or suppression-type diode, is the 1N4001. This diode is
commonly available from electronics suppliers and consumer
sources, such as RadioShack
®
.
Connect the diode in parallel with the coil on the power relay.
Connect the cathode (identified by the white stripe on the diode body)
to the positive coil connection and the anode to the negative
connection. This will cause the diode to reverse bias when voltage is
applied to the coil.