33
Wiring
• Digital Inputs – Preset Speeds
– 4 Preset Speeds set in Parameters 215, 216, 217 and 218
– 4-Position Switch using diodes for signal isolation
– Parameter 214 is set to “External/Preset”
– For additional presets up to maximum of 16, change between
setups and presets.
4-Position Rotary switch for Preset Speeds
In the diagram above terminal 16, programmed for “Preset Reference” turns the
preset speeds ON or OFF. This assumes that parameter 214 has been set to
“External/Preset”. Once terminal 16 sees +24Vdc, the preset speeds are enabled.
Terminals 32 and 33 are used to determine the actual preset speed. Terminal 32 is
programmed as “Preset reference LSB” (least significant bit). As the binary chart shows
above, this is the column on the right. Terminal 33 is programmed as “Preset Reference
MSB” (Most Significant Bit). This is the column to the left. According to this chart when both
terminals 32 and 33 see 0Vdc, the preset speed follows the value placed in parameter 215.
So when the 4-position rotary switch is in position #1, parameter 215 is the reference. In
position 2, terminal 32 sees +24Vdc (1) and terminal 33 sees 0Vdc (0), which places the
value in parameter 216 as the reference. The rest of the chart above explains parameter
217 and 218.
In the wiring diagram above, 2 diodes attached to terminals 32 and 33 and to switch
position 4 prohibit current from flowing between 32 and 33 when position 2 or 3 are used. A
diode type 1N4004 is used in this application. Notice that the banded end (+) of the diode is
attached to terminal 32 and 33.
Terminals 16 and 17 could also be used to select different preset speeds. These
terminals 16 & 17 or 32 & 33 could also be used to select different setups. Terminal 29 could
also be used if one of these terminals were already used. It is possible using 16 and 17 for
preset speeds and terminals 32 and 33 for different setups to have a maximum of 4 different
presets speeds with 4 different setups or 16 different preset speeds.