6
in accordance with the instruction manual, may cause harmful interference to radio communica-
tions. Operation of this equipment in a residential area is likely to cause harmful interference, in
which case the user will be required to correct the interference at his own expense.
This equipment does not exceed Class A limits for radio emissions as set out in Schedule V to
VIII of the Radio Interference Regulations of Communication Canada.
Cet apparel respecte les limites de bruits radioelectriques applicables aux appareils numeriques
de Classe A prescrites dans la norme sur le materiel brouilleur: “Appareils Numeriques,” NMB-
003 edictee par le Ministre des Communications.
What’s New
This section provides a summary of the new features that have been added since the last version
of this manual was printed. It is assumed that the reader is already familiar with the earlier ver-
sions of the 920 Controller.
New Controller Features
• Alarm filtering is now available for:
–
LOW and HIGH TS ALARMS (see sections 3.7.7 on page 33 and 3.7.8 on page 34)
–
LOW and HIGH CURRENT ALARMS (see sections 3.8.2 on page 35 and 3.8.4 on page 36)
–
HIGH GFI ALARMS (see section 3.8.6 on page 36)
–
LOW and HIGH VOLTAGE ALARMS (see sections 3.8.9 on page 37 and 3.8.11 on page 38)
–
LOW and HIGH RESISTANCE ALARMS (see sections 3.8.13 on page 38 and 3.8.15 on
page 39).
Alarm filtering will prevent an alarm from being indicated until the alarm condition has
existed for the duration of the alarm filter time.
• Two new
SWITCH CONTROL MODES have been added for use with Ambient Temperature control:
– Proportional Ambient SSR
– Proportional Ambient Contactor (see sections 3.5.3 on page 21 and 5.2 on page 50).
•
ASCII and RTU ModBus™ communications protocol support (see section 3.9.1 on page 42).
• Support for an isolated, 2-wire RS-485 communications interface (see section 1.4.5).
• A 3-phase power calculation feature has been included for use with balanced, Y-connected
heating loads (see section 3.5.10 on page 23).
• A Temperature Sensor (
TS) Fail Mode feature is now available to allow the output to be forced
ON or OFF when a control temperature failure occurs (see section 3.5.11 on page 23).
•A TEMPBUS™ feature to allow one “master” 920 controller to share its temperature sensor
information with up to 25 “slave” controllers (up to 50 control points). This includes the
addition of three
TS CONTROL MODES (see sections 3.5.12 on page 24 and 5.4 on page 53).
• Support for 100 ohm nickel-iron RTDs along with the standard 100 ohm platinum types (see
sections 3.5.13 on page 24 and 3.5.16 on page 25).
• Manual voltage source selection (see section 3.5.19 on page 26).
• Support for
FORCE ON and FORCE OFF modes using the EXTERNAL input (see sections 3.5.27
on page 28 and 3.6.3 on page 29).
• Features to reload factory default parameters as well as copy configuration parameters from
one point to another are now included (see section 3.11 on page 46).
• New maintenance alarming to track contactor wear (see section 3.8.23 on page 42).
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