27-70 Relay
This parameter is only relevant for a relay wiring conguration.
Use this parameter to set up the function of the option relays.
This parameter is an array. The visibility of options depends on
the MCO option installed in the frequency converter:
•
VLT
®
Extended Cascade Controller MCO 101: Relays 10–
12 are available.
•
VLT
®
Advanced Cascade Controller MCO 102: Relays
13-20 are available.
In any case, the standard relays (Relay 1 and Relay 2), and the
relays in the VLT
®
Relay Option MCB 105 are available.
To set the function of a specic relay, select the relay and then
select the function. If the option [0] Standard Relay is selected,
the relay can be used as a general-purpose relay and the
function can be set in parameter group 5-4* Relays.
Option: Function:
[70] Pump 8 to Drive 7
[71] Pump 8 to Drive 8
[72] Pump 1 to Mains
[73] Pump 2 to Mains
[74] Pump 3 to Mains
[75] Pump 4 to Mains
[76] Pump 5 to Mains
[77] Pump 6 to Mains
[78] Pump 7 to Mains
[79] Pump 8 to Mains
3.24.12 27-9* Readouts
This parameter group contains the cascade controller
readout parameters.
27-91 Cascade Reference
Shows the reference output for the slave frequency converters.
This reference is available even when the master frequency
converter is stopped. This is the speed that the frequency
converter is operating at or would be operating at if it was on.
The value is a percentage of parameter 4-13 Motor Speed High
Limit [RPM] or parameter 4-14 Motor Speed High Limit [Hz].
Range: Function:
0 %* [-200 - 200 %]
27-92 % Of Total Capacity
Shows the system operating point as a percentage of the total
system capacity. 100% means that all pumps are on at full speed.
Range: Function:
0 %* [0 - 0 %]
27-93 Cascade Option Status
Shows the status of the cascade system.
Option: Function:
[0] * Disabled The cascade option is not used.
[1] O The cascade function is turned o.
[2] Running The cascade function is running normally.
[3] Running at
FSBW
The cascade function is running in the
xed speed mode. No variable speed
pumps are available.
[4] Jogging The system is running at the jog speed
set in parameter 3-11 Jog Speed [Hz].
[5] In Open Loop The control principle is set to open loop.
[6] Freezed The system is frozen in the current state.
No changes take place.
[7] Coast The system is stopped due to coasting.
[8] Alarm The system is operating with an alarm.
[9] Staging A staging operation is in progress.
[10] Destaging A destaging operation is in progress.
[11] Alternating An alternation operation is in progress.
[12] All Oine
[13] Cascade CTL
Sleep
27-94 Cascade System Status
This parameter shows the status of each individual pump. The
value depends on the wiring conguration.
•
Relay wiring conguration:
The parameter shows the status of all relays congured
in the system. The value has the following format:
PUMP_NUMBER:PUMP_STATUS. PUMP_STATUS can have
1 of the following values: 0, R, D, X.
For example:
1:D 2:R 3:0 4:X
D: Variable speed pump. R: Fixed speed pump. 0: Not
running. X: Interlock.
•
Serial communication wiring conguration:
The parameter shows the system status. The value has
the following format: MASTER/FOLLOWER:PUMP_STATUS.
PUMP_STATUS can have 1 of the following values: 0, D,
X.
For example:
M:D F:0 F:X
D: Variable speed pump. 0: Not running. X: Interlock or
OFF mode. x: Tripped or no communication.
Range: Function:
0* [0 - 25 ]
Parameter Description Programming Guide
MG20OB02 Danfoss A/S © 05/2018 All rights reserved. 233
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