Lathem LTR-512 - Manual (Page 14)

LTRx-512 Installer’s Guide
10
• We recommend using stranded wire inside the Power
Supply Box. Stranded wire allows for a firm connection to
the Quick Connect terminals. Stranded wires are also less
likely to interfere with the relay board components. If you
must use solid wire, join the stranded wire to the solid wire
in another box
• Note that applying 220/240 VAC power to a system not
setup for that voltage level can severely damage its
electronic parts
• Your Master is already setup for 120VAC operation. If you need to wire it for 220/240VAC,
change the jumper settings as shown in the drawings above
• Attach the supplied quick-connects to the wires as needed
• Plug the quick-connects into the terminal block, as shown in the drawings above. Failure to
properly connect the ground wire can increase interference and cause unsafe operating
conditions
• While the Master is fused internally to protect its electronics, you must also fuse the incoming
AC line as required by your local electrical code. You should connect the unit to a dedicated
10 Amp circuit. You may need to add external MOV’s or diodes to sync a specific clock type
– see Appendix D for the wiring diagram of your type clock. Appendix C shows wiring
diagrams for bell circuits and communications
• Complete any mounting steps in the previous chapter before turning on the power supply
• Turn the toggle switch in the power supply to the “ON” position. The display may show the
message SYSTEM RECOVERY IN PROGRESS" for about 2 minutes, then you will see the
date and time
• Fasten the cover to the power supply
EXTERNAL PULSE-SYNC
Your Master can synchronize to other systems if needed. For example, you have a
non-compatible time clock that the Master cannot synchronize, but it has a built-in bell ringer.
By shorting terminals 7 & 8 on terminal block P1, or terminals 6 & 7 of the communications
terminal on the back of the display unit, the Master will immediately reset to 00:00 (midnight).
If you can program the other device to close its circuit at 00:00 (Midnight) then the two
systems will remain reasonably in sync. WARNING: DO NOT APPLY POWER TO THESE
CONNECTIONS – only close the circuit for a short time (Duration must be at least 1, but not
more than 2 seconds)