Armstrong h-54 Installation And Operating Instruction - Page 6

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i n stal l a t io n &

o p era t ing i nstruct ion s

Using 0 V to 10V DC signal

Vdc Connector

0 -10

part #

D50 040 0 -3 01

2 troubleshooting

This section provides field technicians with a step-by-step

process for accurately diagnosing and troubleshooting difficul-

ties that may be experienced by nmc PerfectSpeed® motors

and the PerfectSpeed User Interface box. It does not override

or replace instructions suggested by the manufacturer of the

fluid circulating system.

To prevent misdiagnosis and unneeded repairs of the motor,

operators should try the steps listed in the Basic Troubleshoot-

ing of the Motor section first. If a problem still exists or there is

an ongoing issue after following the outline in that section, then

proceed to the Motor and Control Unit Diagnostics section for

additional testing instructions.

Basic troubleshooting of the motor

notice

• Always begin your inspection of the motor by stepping

through this section.

Motor is not spinning or runs abnormally

• Check the circuit breaker for trips or accidental shutoff.

• Verify that the cables and power cord are securely con-

nected to the control unit connectors.

• Inspect for shorts, detached wiring, or loose connections.

• Inspect the control unit for broken or loose connectors,

moisture, excessive dirt, or other damage.

Motor rattles or makes excessive noise

• Inspect the motor and pump for accumulated dirt, internal

debris, or other signs of damage.

• Inspect the shaft and verify that the motor shaft spins freely

by hand in both directions without effort.

In-line circulating

pumps

PerfectSpeed® motor and user interface

Motor is not running

If the PerfectSpeed® motor with User Interface isn't running,

perform the following checks:

1 Ensure that both the PerfectSpeed® motor and User Inter-

face have proper line voltage for intended application.

2 Turn the User Interface on-board potentiometer fully clock

wise (100% demand) and check to see if the motor runs.

3 If 0V to 10V DC input is in use, disconnect the external input

from the User Interface and perform Check 2.

4 Check the digital read- out of User Interface for an error code:

Table 5 – User interface error codes

error

reason

action

code

Remove power from both the PerfectSpeed®

Communication

motor and user interface for four (4) min-

utes, then reconnect power and test again.

Check the communication cable

con nection between the PerfectSpeed® mo-

tor and user interface.

Check the continuity of the communication

cable (pin 1-1, pin 2-2 pin 3-4, and pin 4-3).

Low Voltage

This is a reading from the PerfectSpeed®

motor itself. Ensure that there is at least 71V

AC (for 115V AC applications) or 142V AC

(for 208-230V AC applications).

Not a nmc

Connect to a nmc motor.

Motor

Motor and control unit diagnostics

Check 2: Electrical troubleshooting

1 Disconnect or remove power to the equipment being

serviced and allow four (4) minutes for the capacitors to

discharge any residual voltage.

2 Check the rotation and speed of the motor. Determine

if the motor can spin freely by hand without effort or as-

sisted means. If any binding occurs, replace the motor and

control unit.

3 Determine whether the system is wired for 120V AC power

or 240V AC power.

4 Disconnect the power cord from the connector on the

control unit. Inspect the power cord for bent, damaged, or

recessed wired and terminals [fig 1].