OMEGA DPU91-BC Batch Controller System
6
Relay Module
In addition to the Open Collector output
in the DPU91P base unit, the DPU91-BC
includes a Relay Module (DPU90-R) which
adds two programmable dry-contact relays.
The Open Collector output in the base unit
uses the Relay 1 setting in the menus.
The Relay Module is assigned to
relays 2 and 3 in the menus.
Dry-contact relays are electromechanical
switches with a moving contact armature.
They are suitable for many general-purpose
applications, AC or DC, including AC loads
up to 250 V.
Install RC Filter Kits, FP90RC, on relays
used to switch motor or inductive loads.
• Two SPDT dry-contact relay inputs
• User programmable
• 250 V, 5 A maximum resistive loading (AC)
• Can switch line voltage
(typically 120 to 240 VAC)
• Can switch DC voltage (< 30 VDC @ 5A)
• Larger voltage and current ratings than
Open Collector outputs
(30 VDC, 50 mA maximum)
Batch Module
Convert a DPU91P Transmitter
(Generation II or later) to a DPU91-BC
Batch Controller System by plugging in
DPU90-BCM Batch Module.
Optional Module Wiring:
• Wire an external button or keypad
(customer supplied) to stop, start or
resume a batch remotely.
• Wire an external input that can inhibit
a batch from starting.
• The Indicator LEDs on the front panel of
the
DPU91-BC
show the status of
Open Collector (relay 1) and relays 2 and 3.
• Hysteresis and time delay are adjustable
for each relay.
To remove modules:
1) Remove power from the DPU91P
2) Remove the Relay module
3) Loosen bottom screw of Batch module
4) Carefully grip and squeeze the tabs
at the top of the module to release
5) Pull module away from the unit
6) Do not bend the connecting pins
CAUTION:
Switching active loads (usually inductive)
can cause contact arcing suf
fi
cient to
damage the relays. The RC Filter Kit or
“snubber” (part number
FP90RC
) is
available as an accessory to reduce or
eliminate these damaging effects.
Recommended for inductive loads
greater than 50 VAC (remote relays,
solenoids, pumps, etc.).
6. Modules
