Application: Stair Pressurisation Fan With Internal Pid - Zener MSC-3 Instruction Manual

Application: Stair pressurisation fan with internal PID

This setup is for a typical HVAC stair pressurisation fan application that requires air pressure control using
an air pressure transducer and PID controller function provided by the MSC-3 extended features option.
The MSC-3 is configured to run in essential services override (ESO) mode. Prior to commissioning, you will
need to know the type of air pressure transducer signal that is to be used (0-10V,4-20mA etc).
Procedure
STEP 1 Complete the power wiring according to the instructions on pages 7 to 15
STEP 2 Connect the control wiring
as shown.
CAUTION
Do not connect the wire
to terminal 6 yet. The
terminal
cannot be changed while
the MSC-3 is enabled.
i
Essential Services
Override (ESO)
See page 46 for detailed
information
STEP 3 Connect the signal wiring from the air pressure transducer as shown. Consult the pressure
transducer manufacturer's literature for power supply requirements of the transducer. Set the
switches on the extended features option board to suit the type of signal.
Set SW1 on the Extended Features Option as shown. If a 4 to 20mA reference is to be used,
select REMOTE from the REFERENCES menu. AN1 should be displayed. Press Enter.
Press ▲ until you see P22 ANALOG INPT. Press Enter. Set the REF AT 0% to –25%. Press
Enter.
STEP 4 Follow the instructions on page 34 for MSC-3 startup, setting the parameters according to the
table below. Alternate values may be used to suit the application.
Menu
Terminal strip configuration
Input/Output Relay 1
Relay 2
Motor Voltage
Motor Amps
Motor
Motor Hz
Motor RPM
Current Limit
Protection
I t (thermal overload)
2
Auto Restart
Stop/Start
Reset by PF
ESO
References
Ramp Time in ESO
PID Control PID set point value
Acceleration Time
Performance
Deceleration Time
STEP 5 Now connect the wire to terminal 6
End of Procedure
+5V D1
1
configuration
Item
G01 TERMINAL CFG = G04 CONFIG 3
G15 RELAY 1 = O00 RUN
G16 RELAY 2 = O01 TRIP
B01 MOTOR VOLTS = Motor nameplate voltage
B02 MOTOR AMPS = Motor nameplate amps
B03 MOTOR Hz = Motor nameplate frequency
B04 MOTOR RPM = Motor nameplate RPM
D01 CURRENT LIMIT = Motor nameplate current +10%
D02 I2t = Motor nameplate current
E08 A/Rs ALLOWED = 5 starts
E10 RESET BY PF = H00 ENABLE
F03 ESO =P38.. PID OUTPUT
F06 ESO RAMP TIME = 10 sec
P33 SV CHOICE = PRESET 1
Set to % of transducer full scale equivalent to required
pressure.
C04 ACCEL TIME = 10 sec
C05 DECEL TIME = 10 sec
IM00092B
Control Connections and Configuration
MSC-3 Control Board
DIG
D2 D3 D4 EN COM SCN Vref IN+ IN-
2 3 4 5 6 7 8 9
Power up start
MSC-3 Extended
Features Option
IN+ IN-
9 10
-
+ Air pressure
transducer
Suggested Setting
AN
COM
10 11 12
SW 1
The black square
0..5V
represents the
moveable tab in
0..10V
the switch on the
Extended
0..20mA
Features Option.
4..20mA
Page for detailed
information
53
59
41
45
48
49
Extended
Features Option
Manual
43
31