Multi-Stage Outputs

The outputs can be configured as multi-stage outputs via parameter SEQ-05 (number of stage per load output) and SEQ-06 (output control).

Multi-stage outputs can be used to control a 2-stage fan using the 2-stage fan output module “FNA_2St_Fan“ or "FNA_2St_Fan.simple“.

Multi-stage outputs are also used when multiple cooling towers are controlled in sequence. E.g., an application consists of 2 cooling towers and each cooling tower has 3 single-speed fans. For each cooling tower, a sequencer module is required. The number of stages per cooling tower is 3 (3 single-speed fans). To control both cooling towers, an additional sequencer module is required. This module requires multi-stage outputs (3-stages). See figure below:

Fig. 8.   Multistage outputs

Table 9.  Parameter List

Description

Value Range

Default Value

Unit

SEQ-05: number of stages per load output

1…12

1

-