Wiring Instruction
The transmitter has standard screw block connectors. Use shielded twisted pair wiring of at least 22 AWG for all connections
and do not run device wires in the same conduit with wiring used to supply inductive loads such as motors. Disconnect the
power supply before making any connections to prevent electrical shock or equipment damage. Make all connections in
accordance with national and local electrical codes.
This is a 3-wire sourcing device. Connect the positive dc or the ac voltage hot side (24 Vac/dc ± 10%) to the POWER terminal.
The supply common is connected to the COMMON terminal. The device is reverse voltage protected and will not operate if
connected backwards. It has a half-wave rectified power supply so the supply common is the same as the signal common.
Several devices may be connected to one power supply and the output signals all share the same common. Use caution when
grounding the secondary of a transformer or when wiring multiple devices to ensure the ground point is the same on all
devices and the controller.
The analog output is available on the PRES OUT terminal. This signal is switch selectable for either voltage or 4-20 mA active
output. In voltage mode the output is 0-5 or 0-10 Vdc. These options are indicated on the circuit board. The current output
operates in the Active mode and does not require a loop power supply. This means the signal current is generated by the
transmitter and must not be connected to a powered input or device damage will result. Check the controller Analog Input to
determine the proper connection before applying power. Both current and voltage signals are referenced to the COMMON
terminal. The voltage output signal has a minimum load that it is able to drive, similarly the current signal has a maximum
load. Follow the ratings in the Specification section or inaccurate readings may result. See figure 7.
The RELAY output is a normally open dry contact. This signal can be used to directly control an alarm, ventilation fan or may
be connected to a digital input of the BAS for status monitoring. Ensure any loads connected to the relay is within the relay
rating in the Specification section. See figure 8.
The remote zero feature may be used by wiring a dry-contact (relay only) digital output between the ZERO IN and COMMON
terminals. Do not apply voltage to the ZERO IN terminal. See figure 9.
Hardware Setup
The analog output type must be set before the device is connected.
Slide the switch labelled VOLT and mA to the correct
position for the required output signal type, either 4-20 mA or 0-5/10 Vdc. See figure 5. Other parameters may be set on the
DIP switches before or after the device is connected. Any DIP switch change will have an immediate effect on the operation.
DIP Switch Configuration
(See figure 6)
Figure 6
BL OFF / BL ON
Sets the LCD backlight on or off
"WC / Pa
Sets the pressure units to “WC or Pascals
HI Range / LO Range*
Sets the pressure range (See chart below)
+/- Max / 0 - Max
Sets bi- or uni-directional pressure range
LO Avg / HI Avg
Sets pressure averaging to 5 or 30 seconds
10V / 5V
Sets the voltage output scale to 0-5 or 0-10 Vdc (N/A when mA output is selected)
LO Delay / HI Delay
Sets the alarm delay to 10 or 60 seconds (N/A if no relay is ordered)
Normal / Reverse
Sets the alarm action (N/A if no relay is ordered)
*The effect of different DIP switch settings on the pressure range is shown in the following table.
Pressure
Pressure
ULP*1
ULP*2
Units
Range
± Max
0 - Max
± Max
0 - Max
"WC
HI Range
± 1 "wc
0-1 "wc
± 0.25 "wc 0-0.25 "wc
LO Range ± 0.5 "wc
0-0.5 "wc
± 0.125 "wc 0-0.125 "wc
Pa
HI Range
± 250 Pa 0-250 Pa
± 60 Pa
0-60 Pa
LO Range ± 125 Pa 0-125 Pa
± 30 Pa
0-30 Pa
Model
mA = 4-20 mA
(Factory Default)
Output Type Selection Switch
VOLT = Vdc
Figure 5
Greystone Energy Systems, Inc. 150 English Drive, Moncton, NB E1E 4G7 Canada Tel: +1-506-853-3057 Tollfree (North America): +1-800-561-5611 Fax: +1-506-853-6014
Email: [email protected] Web: www.greystoneenergy.com
