Spectrum Controls 1734sc-OE2CIH - Manual (Page 21)

Chapter 2: Installation and Wiring 2-7
User’s Manual Pub. 0300272-01 Rev. A.0
1. Using a bladed screwdriver, rotate the key switch on the mounting base
clockwise until the number required for the type of module being installed aligns
with the notch in the base.
2. Make certain the DIN rail locking screw is in the horizontal position. (You
cannot insert the module if the locking mechanism is unlocked.)
3. Insert the module straight down into the mounting base and press to secure. The
module will lock into place.
2.4.4 Install the Removable Terminal Block (RTB)
A removable terminal block is supplied with your wiring base assembly. To remove the
terminal block, pull up on the RTB handle. This allows the mounting base to be removed
and replaced as necessary without removing any of the wiring. To reinsert the removable
terminal block, proceed as follows:
1. Insert the end opposite the handle into the base unit. This end has a curved
section that engages with the wiring base.
2. Rotate the terminal block into the wiring base until it locks itself in place.
3. If an I/O module is installed, snap the RTB handle into place on the module.
2.4.5 Remove a Mounting Base
To remove a mounting base, you must remove any installed module, and the module
installed in the base to the right. Remove the removable terminal block (if wired):
1. Unlatch the RTB handle on the I/O module.
2. Pull on the RTB handle to remove the removable terminal block.
3. Press on the module lock on the top of the module.
4. Pull on the I/O module to remove from the base.
5. Repeat steps 1, 2, 3, and 4 for the module to the right.
6. Use a small bladed screwdriver to rotate the orange base locking screw to a
vertical position.
7. To release the locking mechanism, lift straight up to remove.
2.4.6 Install a 1734-TOPS Base
1. Position the base vertically above the installed units, such as an adapter, power
supply, or existing module.
2. Slide the base down, allowing the interlocking side pieces to engage the adjacent
installed unit.
3. Press firmly to seat the base on the DIN rail until the base snaps into place.
4. Verify that the DIN-rail locking screw is in a horizontal, locked position before
inserting an I/O module.
2.4.7 Remove a 1734-TOPS Base
To remove a wiring base from the DIN rail, you must remove the module installed to the
right of the base:
1. Squeeze the module locking mechanism of the module to the right of the base,
pulling up to remove the module.
2. Turn the orange locking screw to a vertical position to unlock the base from the
DIN rail.
3. Slide the base up to release it from its mating units.