GE Ecomagination AF-600 FP Programming Manual page 178

Parameter Description
PC-28 Stage Function Time
Range: Function:
15 [0 - The stage function time is programmed to avoid
s 300 s] frequent staging of the fixed speed pumps. The
*
stage function time starts if it is [1] Enabled by
parameter PC-27 Stage Function, and when the
variable speed pump runs at motor speed high
limit, parameter F-17 Motor Speed High Limit [RPM]
or parameter F-15 Motor Speed High Limit [Hz], with
at least 1 fixed speed pump in the stop position.
When the programmed value of the timer expires, a
fixed speed pump is staged.
PC-29 Destage Function
Option: Function:
The destage function ensures that the lowest
numbers of pumps are running to save energy
and to avoid dead head water circulation in the
variable speed pump. If the destage function is
set to [0] Disabled, parameter PC-30 Destage
Function Time is not activated.
[0] Disabled
[1] Enabled
*
PC-30 Destage Function Time
Range: Function:
15 [0 - The destage function timer is programmable to
s 300 s] avoid frequent staging/destaging of the fixed speed
*
pumps. The destage function time starts when the
adjustable speed pump is running at
parameter F-18 Motor Speed Low Limit [RPM] or
parameter F-16 Motor Speed Low Limit [Hz], with 1 or
more fixed speed pumps in operation and system
requirements satisfied. In this situation, the
adjustable speed pump contributes a little to the
system. When the programmed value of the timer
expires, a stage is removed, avoiding dead head
water circulation in the adjustable speed pump.
Illustration 3.67 Destage Function Time
DET-620D
AF-600 FP™ Programming Guide
3.24.4 PC-4# Staging Settings
Parameters determining conditions for staging/destaging
the pumps.
PC-40 Decel Ramp Delay
Range:
10 s
*
120 s]
PC-41 Accel Ramp Delay
Range:
2 s [0 -
*
12 s]
Illustration 3.68 Staging
03/2016 All rights reserved.
Function:
[0 - When adding a fixed speed pump controlled by
a soft starter or a star-delta starter, it is possible
to delay the decel of the lead pump until a
preset time after the start of the fixed speed
pump to eliminate pressure surges or water
hammer in the system.
Use this option only if [1] Soft Starter or [2] Star
Delta is selected in parameter PC-02 Motor Start.
Function:
When removing a fixed speed pump controlled by
a soft starter, it is possible to delay the accel of the
lead pump until a preset time after the stop of the
fixed speed pump to eliminate pressure surges or
water hammer in the system.
Only to be used if [1] Soft Starter is selected in
parameter PC-02 Motor Start.
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