Bell & Gossett 176R0649C Technologic 502 Series Pump Controller - Manual (Page 43)

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39-42 AI Low Warning Proof Time 0s 200s 5s The length of time that an analog input
is below 3 mA before it is considered to
have failed.
39-43 AI High Warning Proof Time 0s 200s 60s The length of time that an analog input
is above or equal to 20 mA before it is
considered to have failed.
39-44 No. of Pumps Active In AZF
(Old Par. 772)
1 4 1 All zone failure occurs when all
pressure feedback signals are lost
(i.e. drop below 3 mA). During this
condition, a predefined number of
pumps will run at a predefined speed.
This parameter sets the number
of pumps and parameter P03-19
determines the speed. Parameter
P39-45 sets the time delay before the
controller activates all zone failure
operation.
39-45 AZF Timeout (Old Par. 317) 0s 99s 10s
If the feedback signal to all active
analog inputs drops below 3 mA, the
controller will begin its All Zone Failure
mode. After the time delay set in this
parameter expires, the display will
show ALARM, ALL ZONE FAILURE.
The controller will then activate
the number of pumps specified by
parameter P39-44 and run them at the
frequency specified in parameter P03-
19.
39-46 Active Zone Number 1 4 The number of the analog input that
has the the largest deveation form it’s
defined setpoint. This is the input that
is used to determine the speed of the
Drive.
39-5* Auto
Bypass/
Misc
39-50 No. Of AFD Fail To Go To
Bypass
1 2 1
In a multiple drive system, when one
drive fails another drive is staged
on. This parameter determines the
number of drives that must fail before
the system will automatically operate
the number of pumps selected in
parameter P39-51 in full speed bypass.
Automatic bypass is not initiated if
pump failure is detected.
39-51 No. Of Pumps To Run In
Bypass
0 2 1 This parameter selects the number of
pumps that should operate at full speed
in bypass when the system goes into
automatic bypass mode.
Table 6-2. Parameter 39-** Group, Detailed Description (continued)