•
27-20 Normal Operating Range
•
27-23 Staging Delay
•
27-24 Destaging Delay
NOTICE
The parameters are installation dependent.
Automatic stage/de-stage threshold
The speed of the variable speed pump at the point of
staging or de-staging is defined by stage or a de-stage
threshold. These settings prevent overshoot or undershoot
in the pressure at staging or de-staging.
The auto tune of staging and de-staging threshold
monitors the feedback at the point of staging or de-
staging and adjusts the settings every time a staging takes
place.
Parameter
Range
Default
27-40 Auto Tune
Staging Settings
{[0] Disabled, [1]
Enabled}
[1] Enabled
Table 4.4
4.2 Operation
The configuration of the Cascade Controller is now
completed.
•
Enable/disable cascade control via through
27-10 Cascade Controller
•
Power up the master drive
When the Cascade Controller is enabled it controls system
pressure by varying the speed of the frequency converter
and by staging pumps on and off.
Two stop functions are provided by the Cascade Controller.
One function quickly stops the system. The other function
de-stages pumps in a sequence, allowing for a pressure
controlled stop. For the VLT
®
AQUA Drive equipped with
Safe Stop, terminal 37 will turn off all relays and coast the
master drive. If any of the digital inputs are set to
[8] Start
and the corresponding terminal is used to control start
and stop of the frequency converter, then setting the
terminal to 0 V will turn off all relays and coast the master
drive. Pressing [Off] on the LCP will cause a sequenced de-
staging of running pumps.
4.2.1 Pump Status and Control
Select parameter group
27-0* Control & Status
to check on
the status of the Cascade Controller and to control
individual pumps. Select a specific pump to view the
current status, the current running hours and the total
lifetime hours. Control individual pumps manually for
maintenance purposes.
Parameter
Pump 1
Pump 2
Pump 3
Pump
…
27-01 Pump
Status
On Drive
Ready
Offline-off
27-02 Manual
Pump Control
No
Operation
No
Operation
No
Operation
27-03 Current
Runtime Hours
650
667
400
27-04 Pump
Total Lifetime
Hours
52673
29345
30102
Table 4.5
1.
Navigate to parameter group
27-0* Control &
Status
2.
Press [
◄
] and [
►
] on the LCP to select the pump.
3.
Press [
▲
] and [
▼
] on the LCP to select the
parameter.
4.2.2 Manual Pump Control
The Extended Cascade Controller allows for complete
control of each pump in the system. Use
27-02 Manual
Pump Control
to control individual pumps through their
relays.
This parameter differs from other value related parameters
as selecting one of these options will cause the action to
occur and then the parameter will revert back to its
default state.
The choices are as follows:
•
[0] No Operation
- Default.
•
[1] Online
- Makes the pump available to the
Extended Cascade Controller.
•
[2] Alternate On
- Forces the selected pump to be
the lead pump.
•
[3] Offline-Off
- Turns the pump off and makes it
unavailable for cascading.
•
[4] Offline-On
- Turns the pump on and makes it
unavailable for cascading.
•
[5] Offline-Spin
- Initiates a pump spin.
If any of the “Offline” selections are chosen the pump will
no longer be available to the Cascade Controller until
“Online” is selected.
If a pump is taken offline through
27-02 Manual Pump
Control
, the cascade Controller attempts to compensate for
the offline pumps as follows:
Configuring the System
VLT
®
AQUA Drive MCO 101/MCO 102
18
MI38C402 - VLT
®
is a registered Danfoss trademark
4
4
