Carrier PC211 specifications Benshaw, Inc. Solid-State Starter Troubleshooting Guide

Table 12 — Benshaw, Inc. Solid-State Starter Troubleshooting Guide

Problem	Probable Causes		Area of Correction
AK board phase cor-	1.	L1 and L3 switch	1.	Switch incoming phases L1 and L3 at top of CD1 or
rect not on.	2.	phases reversed.	2.	CB1.
		Missing phase voltage.		Check for missing phase voltage.
	3.	Improper line voltage.	3.	Verify proper line voltage applied against synchronizing
				transformer voltage.
AK board relay not on.	Ribbon cable not properly		Check ribbon cable for proper seating. Replace board if
	seated.		necessary.
AK board power +15	1.	Improper line voltage.	1.	Make sure proper line voltage is present at primary
vdc not on.	2.		2.	synchronizing transformer.
		Transformer		Check synchronizing transformer secondary voltage as
		malfunction.		follows: On the BC board, measure from TB11-1 to
				TB11-2 and TB11-1 to TB11-3. Both readings should
				be within 30 to 36 vac. On the BC board, measure from
				TB11-1 to TB11-4 and TB11-2 to TB11-4. Both
				readings should be within 18 to 24 vac. Replace
				synchronizing transformer if voltages are not within the
				specified tolerances.
1L boards LEDs not	1.	A short exists between	1.	Remove power and check resistance with ohmmeter.
on.	2.	line and load terminals.	2.	Locate and remove stray wire strands if required.
		An SCR is shorted in the		Remove power. Use ohmmeter to measure the
		phase assembly.		resistance or each SCR phase assembly from anode to
				cathode. The reading should be 50,000 ohm or greater.
				If not, replace phase assembly.
BC board over-temper-	1.	Temperature switch not	1.	Disconnect power and check for continuity between
ature LED (L3) on		functioning properly.		TB11-10 and TB11-11. If no continuity exists, the over-
prior to run command.				temperature switch is not functioning properly. Replace
	2.		2.	defective switch if necessary.
		BC board not		Make sure BC board is functioning properly. Replace
		functioning properly.		board if necessary.
BC board LEDs on	BC board not functioning		Board not functioning properly. Replace board, if neces-
prior to run command.	properly.		sary.
BC board LEDs not on	1.	Phase assembly	1.	Remove power and check SCRs. Ohmmeter reading of
after run command but		malfunction.		each SCR gate to cathode resistance at terminals is 8
before starter reaches	2.	BC board not	2.	to 20 ohm. If not, replace the phase assembly.
full voltage.				Replace board, if necessary.
		functioning properly.
1L board LEDs remain	Imbalance between phases		Check for loose SCR gate lead or open SCR gate.
on after starter reaches	exists in motor terminal		Replace phase assembly, if necessary.
full voltage.	voltages.
BC board run LED	BC board not functioning		Measure 24 vdc at TB11-8 to TB11-4. If voltage is present,
(L5) not lit.	properly.		replace board. If not present, replace relay 1CR.