bonitron M3534B, Customer Reference Manual

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User’s Manual
29
5.
M
AINTENANCE AND
T
ROUBLESHOOTING
Repairs or modifications to this equipment are to be performed by Bonitron approved
personnel only. Any repair or modification to this equipment by personnel not approved by
Bonitron will void any warranty remaining on this unit.
5.1. P
ERIODIC
T
ESTING
The Bonitron Ride-Thru is designed to be low maintenance. While the amount of ride-
thru time does not depend on energy storage devices that degrade over time, Bonitron
still recommends a yearly test of the system in order to ensure the electronics package
is operating. The following steps can be taken to ensure reliability and give comfort
that the system is still able to ride-thru a sag event.
5.1.1. P
ERIODIC
M
AINTENANCE
P
ROCEDURES FOR
M3534R M
ODULE
W
ITHOUT
O
PTIONAL
D
ISPLAY
P
ANEL
1.
Monitor Type-1 box LEDs (Control Board LEDs).

PWR LED should be ON .

RTA LED should be OFF.

OT LED should be OFF .
2.
Verify DC bus voltage level.

Ride-Thru bus should be a few volts below the Inverter bus.
3.
Verify “Threshold” by opening the AC disconnect to the Ride-Thru module
(if equipped). Refer to Section 4.4.1.

The DC bus voltage should drop until it reaches the threshold.

Ride-Thru Active LED should begin to flash.

DC bus should hold for a second at the threshold.

This threshold level should be approximately 10-12% below the
nominal loaded inverter bus.
Each Bonitron Ride-Thru should be tested under load during initial start up to
verify the functionality of the test circuit and that the test does not negatively
affect the process. However, Bonitron recommends that, if the process is
critical, the test cycle be initiated only during a shutdown to avoid unforeseen
problems.
4. Verify switching circuits by causing a TEST cycle while running the
inverter at full load.

Ride-Thru DC bus current should flow during the 2-second test cycle.

Inverter input current should drop.

Ride-Thru DC bus voltage should rise above the threshold. (+17% if
lightly loaded, less if fully loaded.)

Inverter DC bus voltage should rise above the threshold. (+17% if
lightly loaded, less if fully loaded.)

Ride-Thru Active LED should turn ON.

Motor speed should remain constant.

Active cycle counter (if used) should count test cycles.
This completes the maintenance procedure.