Rs-485 Link (Optional); Heater Kit (Optional) - Qualitrol 111-300 Series Instruction Manual

NOTE: Turn off input power, as well as relay control power when
NOTE: Wires should not be left connected to these terminals after the unit
RS- - - - 485 Link (optional) RS RS RS 485 Link (optional) 485 Link (optional) 485 Link (optional)
The optional RS-485 data link provides a method of communicating with a
remote master station using Modbus RTU protocol. Either a 2 wire or a 4 wire
connection may be used. With a 4 wire connection TB1-28 & TB1-29 are the
data transmitted from the ETM and TB1-30 & TB1-31 are the data received by
the ETM. When used in a 2 wire system, connect one wire to TB1-28 and TB1-
30. Connect the other wire to TB1-29 and TB1-31. See Figure 3, wiring diagram
for terminal locations. Refer to Appendix B of this manual for additional
information.

Heater Kit (optional)

Heater Kit (optional)
Heater Kit (optional) Heater Kit (optional)
The optional enclosure heater kit (KIT-031-1), (sold separately), is intended for
use with any 111-300 series unit. Two (2) adhesive backed kapton heaters @ 25
watts each, (supplied with the kit) are to be installed on the reverse side of the
swing-out panel door approximately as shown in Figure 3a. It should be noted
that the "Oil" temperature unit should be used for the wiring connections as well
as for the software configuration. The "Winding" unit can be configured for this
function, but typically, the winding trip relay is required for trip function.
For units powered by 120 VAC or 240 VAC input, connections should be made
as follows:
•
•
•
installing/removing RS-232 wires.
is installed.
Figure 3. Wiring Diagram Label
120 VAC – wire heaters in parallel.
240 VAC – wire heaters in series.
Connect one heater lead wire to supply power (TB1-21) and the
remaining heater lead wire to the normally-open (N/O) contact of the 4
(Trip) relay (TB1-3).
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E l e c t r o n i c T e m p e r a t u r e M o n i t o r
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