ECM
Fan/Filter Unit
Installation and Operation Manual
Doc. 1788-14
©
Copyright 2018 Terra Universal Inc.
All rights reserved
Revised November 2019
Terra Universal, Inc. • TerraUniversal.com • 800 S. Raymond Ave. • Fullerton, CA 92831 • TEL: (714) 578-6000 • FAX: (714) 578-6020
3
6.2 Control Modes
The EC Motor Control Card offers three different control modes for operating the FFU:
MODBUS® RTU networking, 0-10 VDC analog control, or manual control through an
onboard potentiometer.
Manual Control Mode:
The onboard potentiometer can be manually adjusted at the EC Motor Control Panel
using a Philips-head screwdriver. Clockwise rotation increases the motor output, and
counterclockwise rotation decreases the motor output.
Analog Control Mode:
Two terminals located on the EC Motor Control Card are designed to receive either a 0-
10 VDC demand signal or 4-20mA sensor signal to regulate the motor output.
Network Control Mode:
Each EC Motor Control Card in a MODBUS® network must be assigned a unique
address set in
binary format
using the eight DIP switches in the Address DIP Switch
Bank.
Control Mode DIP Switch Configurations
Manual Control Mode
DIP Switch Bank S1:
SWITCH #1 OFF
SWITCH #2 OFF
Analog Control Mode
DIP Switch Bank S1:
SWITCH #1 ON
SWITCH #2 OFF
Network Control Mode
DIP Switch Bank S1:
SWITCH #1 OFF
SWITCH #2 ON
Closed-Loop Feedback
Network Control Mode
DIP Switch Bank S1:
SWITCH #1 ON
SWITCH #2 ON
Example Addresses in Network Mode
MODBUS® Address Value = 1
DIP Switch Bank S2:
SWITCH #1 ON
MODBUS® Address Value = 21
DIP Switch Bank S2:
SWITCHES #1,3,5 ON
NOTE: Address zero should not be used as it is reserved for global commands.
NOTE: The EC Motor Control Card must be power-cycled for any address changes to
take effect.
7.0
Test Probe Terminals
The test probe terminals are provided on the EC Motor Control Card to measure the
motor RPM or check for a PWM signal using a multimeter.
Manual or Analog Control Modes:
To measure RPM, set the Address DIP Switches at a value greater than 1. The test
probe jacks will output 0-2000 mVDC to represent motor RPM.
Example: 500 mVDC = 500 RPM
To measure demand signal, change the Address DIP Switches to the value of 0.
NOTE: Changing the address will not interrupt power to the Control Card.
Network Control Mode:
In the MODBUS® network control mode, the test probe terminals will always output 0 -
2000 mVDC to represent motor RPM.
8.0
120V vs. 220V Configuration
120V Configuration
1.
Black
and
Red
wires are connected to the same terminal.
2.
Yellow Jumper Cable is installed.
220V Configuration
1.
Black
and
Red
wires connect to the upper terminal as shown.
2.
Yellow Jumper Cable is removed.
