Honeywell NXL Series Applications Manual page 62

Page 62 (68)
4.11.3 Description of Pump and Fan Cascade control parameters
2.10.1 Number of auxiliary drives
With this parameter the number of auxiliary drives in use will be defined. The functions
controlling the auxiliary drives (parameters 2.10.4 to 2.10.7) can be programmed to relay
outputs.
2.10.2 Start delay of auxiliary drives
The frequency of the drive controlled by the frequency converter must remain above the
maximum frequency for the time defined with this parameter before the auxiliary drive is
started. The delay defined applies to all auxiliary drives. This prevents unnecessary starts
caused by momentary start limit exceedings.
2.10.3 Stop delay of auxiliary drives
The frequency of the drive controlled by the frequency converter must remain below the
minimum frequency for the time defined with this parameter before the drive is stopped. The
delay defined applies to all auxiliary drives. This prevents unnecessary stops caused by
momentary falls below the stop limit.
2.10.4 Automatic changing between drives
0= Not used
1= Autochange with aux pumps
The drive controlled by the frequency converter remains the same. Therefore, mains
contactor is needed for one auxiliary drive only.
Figure 1- 35. Autochange applied to auxiliary drives only.
4
Description of parameters
M
M
Aux. drive 2
Aux. drive 1
NXL
M
vuorot1.fh8
NX12k96.fh8
Honeywell