WIRING CONNECTIONS
After the unit has been mechanically mounted, it is ready to be wired. All
conductors should meet voltage and current ratings for each terminal. Also
cabling should conform to appropriate standards of good installation, local codes
and regulations. It is recommended that power supplied to the unit be protected
by a fuse or circuit breaker. All wiring connections are made on removable
plug-in terminal blocks. There is a separate terminal block for the bottom board
(TBA) and optional top board (TBB). When wiring the unit, remove the terminal
block and use the numbers on the label to identify the position number with the
proper function. Strip the wire, leaving approximately 1/4" bare wire exposed
(stranded wires should be tinned with solder). Insert the wire into the terminal
and tighten down the screw until the wire is clamped tightly. Be sure all wires are
clean and the connections are tight to ensure good conductivity. Each terminal
can accept up to one 14-gauge, two 18-gauge or four 20-gauge wire(s). After the
terminal block is wired, install it into the proper location on the PC board. Wire
each terminal block in this manner.
POWER WIRING
Primary AC power is connected to TBA #1 and 2 (marked VAC 50/60 HZ,
located on the left hand side of the bottom terminal block). To reduce the chance of
noise spikes entering the AC line and affecting the indicator, the AC power should
be relatively “clean” and within the specified ± 10% variation limit. Drawing
power from heavily loaded circuits or circuits which also power loads that cycle on
and off, (contactors, relays, motors, machinery, etc.) should be avoided.
USER INPUT WIRING
User inputs (PGM.DIS., E1-CON, and optional E2-CON) are digital inputs
that are active when connected to TBA #5 Common. Any form of mechanical
switch, sinking open collector logic with less than 0.7 V saturation may be used.
The use of shielded cable is recommended. Follow the Additional EMC
Installation Guidelines for shield connection.
OUTPUT WIRING
RELAY CONNECTIONS
To prolong contact life and suppress electrical noise interference due to the
switching of inductive loads, it is good installation practice to install a snubber
across the contactor. Follow the manufacturer’s instructions for installation.
Note: Snubber leakage current can cause some electro-mechanical devices to be
held ON.
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