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F A N S C / P 1 . 2
6.5. Volume flow measurement device
The fans are equipped with a volume flow measurement device as
standard. This facilitates easy volume flow determination and
monitoring of the fan when installed.
q
K Calibration factor m
Δp
For fans that are fitted in a chamber, the pressure difference between
stable pressure in the suction side chamber and the pressure at the
inlet nozzle should be measured. It is important to ensure that the static
pressure (measured upstream of the inlet nozzle) is not distorted by
dynamic pressure effects. If the differential pressure is routed via a
pressure sensor, the signal can also be used for purposes. In order to
calculate the volume flow, a calibration factor K is required for the
respective fan. This is determined by a comparison measurement on a
standard test rig with unimpaired inflow.
COPRA P/C
Calibration
Size
factor K10
250
73
280
79
315
89
355
106
400
128
Calib. factor deviation: Standard calibration factor K10 < 10%
If the simplified formula qV = K x (delta_p)^0,5 excl. gas density (rho)
shall be used in stead, the K-factor needs to be multiplied with
(2/ρ)^0,5, e.g. 1,291 for gas density ρ = 1,2 kg/m3.
When installing the measuring hose, it is important to ensure that the
hose is well secured and cannot rub against the impeller. Furthermore
it is important to ensure that the hose is not excessively crushed or
kinked.
NOTICE
Certain parameters are required for commissioning. These are
factory presets. Incorrect parameters can lead to problems,
particularly during start-up.
6.6. Operating modes
The speed can be set by analog control signal (0-10 V, 4-20 mA), PWM
or by Modbus RTU. The control behavior of the individual interfaces is
explained in the following sections.
6.6.1. Analog control (analog input signal)
0-10 V
100
80
60
40
20
0
0
1
2
3
Volume flow m³/h
V
s/h
2
Gas density kg/m³
Differential pressure nozzle Pa
Dü
COPRA P/C
Calibration
Size
factor K10
450
500
560
630
710
4
5
6
7
8
Control voltage in V
4-20 mA
100
80
60
40
20
0
0
2
6.6.2. PWM (PWM input)
Another method of setting the fan speed is with PWM input. Pin
[PWM] accepts a PWM signal at a frequency anywhere between 50Hz
and 1kHz. The duty cycle of the PWM frequency determines the fan
speed, with the minimum duty cycle of 5% corresponding with
minimum demand and increasing linearly to 100% demand at >95%
duty cycle.
156
Duty Cycle (%)=Turn on Time/(Turn on Time + Turn off time)*100
190
242
310
385
100
80
60
40
20
0
0
10
6.6.3. Modbus operation
The Modbus interface has the following default communication
settings:
• Protocol: Modbus RTU (8 bit data)
• Address/ID: 247
• Baud rate: 11500
• Stop bits: 1
• Parity: none
• Minimum response time: 50 ms
• Response timeout: >500 ms
The Modbus interface can be used for the following purposes:
1. Adjustment of:
• Modbus communication settings and monitoring (timeout)
• Settings/functions of digital/analog inputs/outputs, -min./max. speed,
ramp times, frequency blanking etc.
2. Control:
• Enable/disable, presetting of speed
3. Monitoring:
• Query of operating data, such as actual speed, power, fault
9
10
messages, actual state of digital/analog inputs/outputs
© 2023 Regal Rexnord Corporation. All Rights Reserved.
4
6
8
10
12
Control current in mA
20
30
40
50
60
PWM duty cycle in %
XXXXXXXXXX • Format# XXXXXX R1
E N
14
16
18
20
70
80
90
100
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