Hydromatic Novus 1000 Series, Installation And Service Manual

b. Floats may be miswired to

control panel. Check float
type (N.O. or N.C.) and
hook up by re fer ring to the
schematic. If the start and
stop floats are hooked in
reverse, pump will short
cycle and will not pump the
level down.

1. Is water level in the 

sys 

tem high enough to 

ac ti vate  the  floats?

2. If there is enough water

in the system (with the
power turned off), mark
and disconnect the off
and on floats. Next,
install jumper wires in
the terminal blocks for
off and on floats. Turn
power back on, put H-O-
A switch in Auto and see
if pump runs.

3. If pump runs with

jumper, problem is with
floats. Remove jumpers
and troubleshoot floats
with ohmmeter.

4. If pump does not run

in Auto mode with
jumpers, check Auto
circuit wiring in panel.

3. Pump runs, but run light

does not energize.

a. Re 

move light and check

with an ohmmeter.

b. Check run light wir ing.

4. Pump runs but does not

pump down the wet well.

a. On three phase only, 

pump rotation may be
wrong. Wiring of pump to
con 

trol pan 

el may be

reverse sequenced.

b. Impeller may be dragging in

volute due to sol 

ids. High

am per age 

draw 

would 

identify this.

c. Refer to the pump manual

for other possibilities such 
as closed discharge gate
valve, etc.

5. Severe  humming/chat ter ing

of contactors and control
relays. 

a. There may be low voltage.

Check voltage at primary
and secondary of control
transformer us 

ing a 

volt me ter.  This  low  voltage
condition may cause severe
chat 

ter 

ing and burnout of

contacters and relays. 

b. Contactor may have dust

around magnet of coil
struc 

ture. Dry or clean 

as re quired.

c. Check voltage to the 

control panel. Contactors
require a minimum of 85%
of full volt 

age to pull 

in without chatter. If the
problem is a re 

cur 

ring 

one, measure voltage with
recorder on a 24 hour basis.

d. Make sure the floats are

locat 

ed away from any

turbu lence.

e. Dry out the junction box 

(if furnished); moisture 
in the junction box may
cause relays to energize 
intermittent ly.

6. Short cycling pump.

a. Check float controls.

7. Run light stays on.

a. Selector switch may be in

the Hand position.

8. Nuisance tripping of 

over 

load on motor starters

or   cir cuit break ers.

a. Check pump amp draw with

amp probe and compare to
nameplate amps on pump.

b. The impeller may be locked

up due to excessive debris
or solids.

c. Possible motor failure (fault

in windings).

d. Pump may be miswired to

ter mi nal  block.

e. Voltage and current 

unbalance. Three phase
only.

Voltage un bal ance on three

phase power sources can
cause motor current to
become 

un bal anced 

and

exces 

sive heating will 

re sult. 

Trip ping 

of 

the 

over 

load protectors and 

premature motor failures 
can be expected if the 
current unbalance exceeds 
five percent.

Percent Maximum 

Current

Current 

= 

Difference from x 100

Unbalance Average 

Current 

_______________ 

Average Current

To determine if motor current 
un 

bal 

ance is a function of the

motor or the power supply:

1. Label the leads and 

the   ter mi nals 1, 2, and 3
respectively.

2. Record the amperage for

each lead.

3. Move each lead to the

next terminal (1 to 2, 2 to
3, 3 to 1).

4. Again read the amperage

of  each lead.

5. Move each lead to the

next terminal (1 to 3, 2 
to 1, 3 to 2).

6. Again read the amperage 

of each lead.

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