23
7.4.6 P04 Alarm
Menu
Settings that determine the level or condition at which an alarm fault is generated.
Item# description
units step
min
max
default
display
1 General
Service Timer
hours 1
0
10000
2000
H3
2000
2 Air
Filter
Service Timer
hours 1
0
10000
500
H4
500
Service Countdown Timer:
The service countdown timer will count down from the set value in accordance with running hours. When the
item is viewed the service hour’s value will reflect the current hours remaining until a routine maintenance
service is due (zero hours). When zero hours are reached a service due alarm will be displayed. The alarm
can only be reset when the service hours is adjusted above zero. The service hours count will continue to
count down in negative values until the timer is re-set. This function is intended to promote timely routine
maintenance and indicate how many running hours have passed since a service due alarm was displayed.
The value can be adjusted back to the required maintenance interval time each time a maintenance service
is completed.
7.4.5
P08
Speed Regulation Menu
The speed regulation function provides P&I loop control of a variable speed drive (using 4-20mA output 1) in
order to maintain a steady target pressure level (load pressure).
Speed regulation is used to maintain delivery pressure at the load pressure set point. If pressure rises to the
unload pressure set point the load solenoid output is de-energised and the compressor unloaded. While in
the offload state the controller will maintain speed at the set offload speed setting. If pressure remains above
the load pressure set point for longer than the set run-on-time the main motor will stop and the controller will
enter the standby state. When pressure falls below the load pressure set point the motor is re-started, if in
standby state, and the load solenoid output is energised. Full range speed regulation is then applied.
If connected to a CMC sequence controller system, and the system consists of more than one VSR (variable
speed regulated) compressor, any VSR compressor assigned as base load will be biased to operate at the
set optimum speed setting. Any VSR compressor assigned as top-up will use full range speed regulation. In
addition, the target pressure of each VSR compressor is automatically referenced to the sequencer to
maintain exact pressure control regardless or pressure differentials between compressors. In this manner up
to 12 VSR compressors can be controlled as a single coherent system with full efficiency capacity matched
management, sequence rotation and single pressure set point control.
item# description
units step
min
max
default
display
1 Speed
regulation
control mode
--- 1
0 2 0
SC
0=disabled
1=fixed speed regulation
2=variable speed regulation
2 maximum
speed
rpm 100
100 10000
3000
SH
3 minimum
speed
rpm
100 0 9900
1500
SL
4 optimum
speed
rpm
100 100
10000
2700
So
5
unload speed
rpm 100 0
9900 1800
Su
6
rpm actual
rpm ---
---
---
---
S>
View only, for information
7
output actual
mA --- --- ---
---
A>
View only, for information
8
P factor
--- 1 0 100 40
Pf
9
I factor
--- 1 0 100 10
If
10 Control
range
percent
% --- --- --- ---
C>
View only, for information
11
Maximum
ramp rate
% 1 5 100 10
rr
