Operating and Maintenance Instructions
210-OMI13277_Iss1.doc
ORIGINAL INSTRUCTIONS
Page 7 of 15
© ebm-papst UK Ltd, 2012
Chelmsford Business Park Chelmsford Essex CM2 5EZ
Telephone: +44(0)1245468555 Fax: +44(0)1245466336
e-mail
CN1090
Proportional Band Control, Commissioning
Note - during this procedure the Control Band Set-points (sensor output voltage set-points) will be temporarily
connected to the Fan Speed control outputs to allow their values to be simply measured with a voltmeter. The
commissioning procedure has two parts;
1)
Set the Proportional Band Set-points
2)
Set the Fan Minimum and Maximum speeds.
Caution – during this procedure the Fan Speed Control voltage outputs will not be limited by the S2 & S3 setting.
Both outputs may be active.
Set the Proportional Band set-points:
1)
Determine the Proportional Band set-point voltages required for the installed system (see sensor data
sheets).
2)
Set SW1 position 1 OFF to select Proportional Band control mode
3)
Set SW1 position 5 ON to select Proportional Band Commissioning mode
4)
Set SW1 position 6 OFF to connect Sensor 1 set-points to the controller Fan Speed outputs. NTC1 Red
LED pulses.
5)
Connect a Voltmeter to
Fan 1 Speed Control PWM Output, J2 pin 3.
6)
Adjust R1 for a voltmeter reading equal to the Sensor 1 Bottom of proportional control band voltage.
7)
Move the Voltmeter to
Fan 2 Speed Control PWM Output, J2 pin 6.
8)
Adjust R2 for a voltmeter reading equal to the Sensor 1 Top of proportional control band voltage.
9)
If Sensor 2 is not in use, set R3 and R4 to minimum and omit the next five steps (go to step 15).
10)
Set SW1 position 6 ON to connect Sensor 2 set-points to the controller Fan Speed outputs. NTC2 Red
LED pulses.
11)
Connect a Voltmeter to
Fan 1 Speed Control PWM Output, J2 pin 3.
12)
Adjust R3 for a voltmeter reading equal to the Sensor 2 Bottom of proportional control band voltage.
13)
Move the Voltmeter to
Fan 2 Speed Control PWM Output, J2 pin 6.
14)
Adjust R4 for a voltmeter reading equal to the Sensor 2 Top of proportional control band voltage.
15)
Commissioning complete - set SW1 position 5 OFF to select Proportional Band normal operation. Set
SW1 position 6 for required SL1 Select Input operation, see table above.
Alternative Commissioning Procedure for Proportional Band set-points:
For this method the voltage at each Variable Resistor Test point is monitored, instead of at the Fan Speed
Outputs.
1)
Set SW1
for Proportional Band control mode and Normal Operation (not commissioning mode)
2)
Determine the Proportional Band set-point voltages required for the installed system (see sensor data
sheets).
3)
Adjust R1 to R4 for the required set-points, monitoring the R1-R4 test point voltages with the voltmeter.
The test point voltage is scaled 0-3.3V instead of 0-10V, so the indicated voltage must be multiplied by 3
to determine the true 0-10V set-point value. The test point location is shown in “PCB Component
Location” below.
Local / Remote 0-10V control mode (including BMS linear control)
Set R2 fully clockwise.
Set R1, R3 and R4 fully anti-clockwise.
Set rotary Switch S2 to minimum required fan speed, see table below.
Set rotary switch S3 to maximum required fan speed, see table below.
Connect the Local / Remote / BMS 0-10V control to “0-10V Input, Sensor One“ (J3 pin 3) and “0V“ (J3 pin 6).
The external signal 0-10V signal will then control the fan speed over the 0-10V fan speed control voltage range.
For local manual control an ebm-papst RM-ECv is recommended.
