Backup emergency inverter with high bay occupancy sensor lights

M

Mgilc003

Member
Location
virginia beach, va
Hello,

Recently I was contacted to replace an inverter for emergency back up lighting on high bay light fixtures.

The previous inverter was bypassed and turned off when I did my initial assessments and let the smoke out as some as it was turned on.

Today we were commissioning the new unit with DSPM and the inverter does not switch back to line power once it is restored.

They recommended installing an isolation transformer because according to him there is an issue with the neutral wires on the load side of motion controls to one of the lights.

He described it as either a secondary to ground or a different issue. I ohmed out the load neutral to the line neutra when it was disconnected and read OL but I guess it possible there is a very high resistance path to to gound.

The other guy on the phone mentioned motion sensors or photocells could cause an issue.

But the thing is there is a mirror unit on the other side that does not have an issue and is working without an isolation transformer and with motion sensors.

Wondering about your thoughts. Installinh and isolation transformer sound like masking the issue.
 
Deltaforce said:
No conflict two

UL924 Automatic Load Control Relay Lighting | | Current

UL924 Automatic Load Relay allows emergency lighting to be controlled with normal lighting, ensuring that the emergency lighting will be forced to full bright upon loss of normal power.
www.currentlighting.com www.currentlighting.com
Click to expand...
That is not an occupancy control, and that requires a normal power and and an emergency power circuit. While an occupancy controller could be connected to the load relay, if that was the case, the occupancy control would have no effect on the emergency circuit (the problem described in the original post), as the normal and emergency power is isolated by the load control relay. In addition, there is nothing in the original post to suggest that there is any such control in the system in question.
 
Mgilc003 said:
Hello,

Recently I was contacted to replace an inverter for emergency back up lighting on high bay light fixtures.

The previous inverter was bypassed and turned off when I did my initial assessments and let the smoke out as some as it was turned on.

Today we were commissioning the new unit with DSPM and the inverter does not switch back to line power once it is restored.

They recommended installing an isolation transformer because according to him there is an issue with the neutral wires on the load side of motion controls to one of the lights.

He described it as either a secondary to ground or a different issue. I ohmed out the load neutral to the line neutra when it was disconnected and read OL but I guess it possible there is a very high resistance path to to gound.

The other guy on the phone mentioned motion sensors or photocells could cause an issue.

But the thing is there is a mirror unit on the other side that does not have an issue and is working without an isolation transformer and with motion sensors.

Wondering about your thoughts. Installinh and isolation transformer sound like masking the issue.
Click to expand...
Isolation transformer, the solution to mitigate power quality issues by wiring/occupancy sensor
Before purchase it, check new inverter ok , checking it change to normal supply with no load connect to its ourput
Also check occupancy sensor and wiring separately
 
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